Unveiling the Therapeutic Potential of Laurus nobilis L.: Integrative Insights into Phytochemistry, Pharmacology and Biophysical Characteristics

Abstract

Laurus nobilis L. (Lauraceae), widely recognized as bay laurel, has long held prominence in traditional medicine across diverse cultures and has attracted growing attention within contemporary pharmacological research. This review endeavors to synthesize and critically evaluate evidence from in vitro, in vivo, and clinical studies to elucidate the therapeutic potential of this species, an aromatic evergreen shrub native to the Mediterranean region. Its leaves and essential oil have long been utilized in culinary and traditional medicine, and recent scientific studies have revealed a wide range of pharmacological properties. A comprehensive literature search was conducted using the keyword “Laurus nobilis L.” across Scopus, PubMed, and Google Scholar databases. The search included English-language resources published up to 31 January 2025, focusing on in vitro, in vivo, and human studies. Exclusion criteria encompassed letters, conference proceedings, and articles related to agriculture, genetics, nursing, environmental and veterinary sciences, multidisciplinary studies, and non-medical or pharmaceutical themes. The findings indicate that L. nobilis exhibits diverse pharmacological activities, including wound-healing, dental plaque-reduction, hepatoprotective and gastroprotective effects, antidiabetic activity, antioxidant and anti-inflammatory properties, antimicrobial and antiparasitic effects, neuroprotective potential, antigenotoxic and anti-hypersensitivity actions, and renal protection. This review manuscript seeks to further illuminate the pharmacological potential of Laurus nobilis while articulating the biophysical underpinnings and mechanistic coherence through which its bioactive constituents manifest their therapeutic effects. In conclusion, L. nobilis demonstrates significant promise as a natural, effective, and safe therapeutic candidate for various health conditions. Nonetheless, further clinical research is warranted to substantiate its efficacy and safety, thereby enabling its integration into evidence-based medical practice.

1. Introduction

The bay leaf, also referred to as bay laurel, originates from Laurus nobilis L., an evergreen species within the Lauraceae family. Indigenous to the Mediterranean region, this aromatic plant thrives in temperate and subtropical zones, including parts of Central and South America, Asia, Europe, and the Middle East [1]. Widely used in Turkish, Indian, Italian, and French cuisines, bay leaf adds a distinctive flavor as a culinary herb.

Moreover, bay leaves and their essential oil have a long history of use in traditional and folk medicine. L. nobilis has traditionally been valued for its purported emetic, stimulant, and diuretic effects and has been used to alleviate various conditions, including respiratory and infectious disorders, gastrointestinal disturbances, menstrual disorders such as amenorrhea, rheumatism, neuralgia, and scabies [2,3]. Traditional applications have also included supporting nervous system function, regulating metabolism, and managing conditions such as diabetes and cardiovascular disorders. Despite its extensive history of use, however, relatively limited human research has been conducted to establish the health-promoting effects of bay leaves. More recently, L. nobilis has attracted increasing scientific interest because of the diverse biological activities associated with its leaves and essential oil, including antimicrobial, antioxidant, and anti-inflammatory effects. In addition to its medicinal applications, L. nobilis is widely used in the food industry, with its dried leaves serving as a culinary spice and its essential oil being valued for its bioactive properties. Phytochemical analyses have identified numerous volatile constituents in L. nobilis, including α- and β-pinene, α-terpinyl acetate, 1,8-cineole, methyl eugenol, linalool, and sabinene [3,4]. The diverse chemical composition of L. nobilis provides a basis for exploring not only its pharmacological properties but also the biophysical characteristics of its bioactive constituents, offering a more comprehensive perspective on their potential therapeutic effects.

From a biophysical perspective, the therapeutic actions of L. nobilis arise from the structural and physicochemical properties of its phenolics and terpenoids. These phytochemicals modulate lipid bilayer organization, membrane dipole potential, and electrical properties, thereby influencing ion-channel gating and cellular signaling pathways [5]. Efimova and colleagues have demonstrated that plant-derived polyphenols significantly alter the dipole potential of the membrane and ion-channel behavior, highlighting the importance of lipid–phytochemical interactions in biological function [6]. Similarly, terpenoids from L. nobilis have been shown to affect ionic permeability, GABAergic neurotransmission, and apoptotic signaling, underscoring their structural biophysical relevance [7]. Interestingly, linalool, eugenol and its methylated derivative, methyl eugenol, and terpinen-4-ol occupy the hydrophobic L-shaped pocket of soluble epoxide hydrolase (sEH) and form additional interactions with catalytic-site residues, including π–π stacking and hydrogen bonding, which may contribute to their anti-inflammatory activity. In particular, terpinen-4-ol forms an additional hydrogen bond through its hydroxyl group [8]. Recent studies further reveal that L. nobilis extracts influence chemotactic signaling and sensory biomechanics in model organisms, demonstrating their capacity to modulate mechanotransduction pathways [9]. Additionally, these physicochemical and functional characteristics of L. nobilis essential oil and various extracts and chemical components make them suitable candidates for incorporation into biomaterials and nanostructured systems, which highlights their relevance to bioengineering and biomechanical features of the marker components [10,11]. In addition, the observed in vivo anti-inflammatory activity of the ethanolic leaf extract of L. nobilis in chronic and acute inflammation models was supported by molecular docking simulation, which revealed favorable binding of β-carotene, quercetin, and rutin with COX-2 and of quercetin and rutin with TNF-α and COX-2 through hydrogen-bond formation, while the SVM–PCA-based QSAR model demonstrated robust predictive performance for the investigated phenolic compounds. Together, these findings position L. nobilis as a species whose pharmacological profile is deeply rooted in biophysical mechanisms involving membrane dynamics, protein conformational regulation, and cellular signaling [12,13].

This review aims to further elucidate the pharmacological potential of L. nobilis by exploring the biophysical basis and underlying mechanisms through which its bioactive constituents exert their therapeutic effects.

2. Survey Method

In conducting this review, an extensive literature search was undertaken across Scopus, PubMed, and Google Scholar, employing the term “Laurus nobilis” within abstracts, titles, and designated keywords. Eligible publications included English-language articles reporting in vitro, in vivo, or clinical investigations, provided they were published before 31 January 2025. Excluded from consideration were letters, conference proceedings, and studies primarily addressing genetics, agriculture, nursing, environmental science, veterinary medicine, multidisciplinary fields, or any subject matter not directly pertinent to medicine and pharmacy.

History and General Characteristics

The research primarily focused on exploring the reported pharmacological and toxicological effects of L. nobilis L. Using various standard databases revealed that the overall therapeutic background of L. nobilis covers a vast array of pharmacological properties, as revealed in the present study and summarized in

Table 1. General information and relevant data collection.

Research Sources and References	Scopus, PubMed, and Google Scholar
The total number of references used	82
Total number of references used for the in vitro section	52
The topics of in vitro activity reviewed.	Antioxidant and radical scavenging activities, Antimicrobial, Antiparasitic activity, Anti-inflammatory effect, Antidiabetic, Enzyme inhibition, Cytotoxicity, antigenotoxicity, Antihypertensive, Neuroprotective, and Anti-skeletal muscle atrophy.
Total number of references used for the in vivo section	28
The topics of in vivo activity reviewed.	Analgesic, Anti-anxiety, Anti-skeletal Muscle Atrophy, Antioxidant, Anti-inflammatory activity, Anti-parasite, Antimicrobial, Cytotoxicity, Genotoxicity, Antidiabetic, Effect on the liver, gastrointestinal system, blood, and kidney, Wound healing, Anti-amnesic, Anti-atherogenic

, which provides general information about the number and topics of articles discussed in this review.

3. Linking Chemical Content to Therapeutic Activity

L. nobilis is a medicinal plant with a therapeutic potential closely tied to its rich array of volatile and non-volatile bioactive compounds in its leaves, fruits, and other parts, which contribute significantly to its therapeutic effects. In the leaves, compounds such as quercetin and kaempferol from flavonols, along with rutin, a flavonol glycoside, have been identified and are recognized for their potent free radical-scavenging and anti-inflammatory responses [14]. The fruits are notably rich in caffeic and chlorogenic acids, as well as proanthocyanidins, which contribute significantly to the plant’s anticholinergic and antimicrobial activity [15]. Both the leaves and fruits are rich in essential oils, primarily composed of α-terpineol, 1,8-cineole, and camphor, which are recognized for their pronounced antimicrobial and antioxidant properties. Additionally, non-volatile constituents such as flavonoids, phenolic acids, tannins, sesquiterpene lactones, and proanthocyanidins contribute to its anti-inflammatory, antidiabetic, and antioxidant activities [15]. Experimental and computational studies have confirmed the plant’s phenolic content as a key factor in its anticholinergic and antioxidant properties [15]. These bioactivities support its traditional use in treating respiratory ailments, digestive disorders, and skin infections. Studies have demonstrated that 1,8-cineole not only acts as a bronchodilator but also complements the anti-inflammatory action of flavonoids. Also, the essential oil fractions rich in α-pinene and linalool possess broad-spectrum antimicrobial properties. Additionally, the antimicrobial potency of ethanolic, methanolic, and camphor-rich extracts of L. nobilis has been validated against a wide range of bacterial pathogens, including Staphylococcus aureus and Bacillus subtilis, as well as fungi such as Candida albicans [14]. The bioactivity of L. nobilis is predominantly linked to its rich content of phenolics, flavonoids, and terpenoids such as eugenol, camphor, and 1,8-cineole, which exert antimicrobial effects primarily through disruption of cellular membrane integrity and inhibition of critical enzymatic pathways [15]. In addition, antioxidant evaluations indicate that extracts, fractions, and isolated phytochemicals from this species exhibit potent free radical-scavenging activity, thereby mitigating oxidative stress. The convergence of antioxidant and anti-inflammatory mechanisms underscores the therapeutic potential of L. nobilis in the management of chronic disease. Its therapeutic versatility stems from the interplay of its diverse secondary metabolites. A study on Moroccan bay laurel confirmed high levels of phenolic acids and minerals, reinforcing its antioxidant potential [16]. Moreover, the study has highlighted the presence of lignans and triterpenoids in various plant parts, which may contribute to its anticancer potential [16]. The therapeutic synergy between these compounds underscores the importance of whole-plant extracts in traditional and modern phytotherapy. Moreover, the synergistic effects of these compounds enhance the efficacy of whole-plant extracts, making L. nobilis a valuable candidate for natural antimicrobial formulations [16]. Figure 1 presents a structured pathway from the botanical features of L. nobilis through its essential oil and leaf-extract constituents to the principal phytochemical classes, flavonoids, phenolic compounds, and terpenes. These molecular groups underpin diverse pharmacological actions, including antioxidant, anti-inflammatory, antimicrobial, metabolic, and organ-protective effects. The figure highlights how phytochemical composition translates into a coherent therapeutic profile supporting evidence-based herbal medicine and phytopharmacological applications.

The summary of collected clinical and pharmacological data on activities associated with L. nobilis is presented in

Table 2. In vitro pharmacological studies of L. nobilis leaf essential oil and extracts.

Activity	Extract/Compd.	Method/Assay	Outcome	Ref.
Antioxidant and free radical scavenging activities	Acetone extract	DPPH radical scavenging	IC50 (mg/mL) = 0.02 ± 0.00	[17]
		Superoxide anion scavenging assay	IC50 = 0.06 mg/mL as against 0.46 mg/mL
	Ethanol extract	(DPPH), reduction of molybdate compared to BHT	Mean ± SD = 0.48 ± 0.019, p < 0.001	[19]
		FRAP (reducing (Fe3+/Fe2+) power compared to BHT	Mean ± SD = 0.21 ± 0.0006, p < 0.001
	Ethyl acetate extract	(DPPH), reduction of molybdate compared to BHT	Mean ± SD = 0.10 ± 0.006, p < 0.001
		FRAP (reducing (Fe3+/Fe2+) power) compared to BHT	Mean ± SD = 0.21 ± 0.0006, p < 0.001
	Aqueous extract	DPPH, reduction of molybdate compared to BHT	Mean ± SD = 0.05 ± 0.003, p < 0.01
		FRAP (reducing (Fe3+/Fe2+) power) compared to BHT	Mean ± SD = 0.12 ± 0.001
	Diethyl ether extract	DPPH radical	IC50 (μg/mL) = 127.38	[20]
		O2 •− radical	IC50 (μg/mL) = 327.60
		NO radical	IC50 (μg/mL) = 168.77
	Chloroform extract	DPPH radical	IC50 (μg/mL) = 139.42
		O2 •− radical	IC50 (μg/mL) = 429.43
		NO radical	IC50 (μg/mL) = 322.84
	Ethyl acetate extract	DPPH radical	IC50 (μg/mL) = 83.24
		O2 •− radical	IC50 (μg/mL) = 163.57
		NO radical	IC50 (μg/mL) = 158.63
	n-Butanol extract	DPPH radical	IC50 (μg/mL) = 181.35
		O2 •− radical	IC50 (μg/mL) = 288.64
		NO radical	IC50 (μg/mL) = 386.80
	Aqueous extract	DPPH radical	IC50 (μg/mL) = 161.83
		O2 •− radical	IC50 (μg/mL) = 486.32
		NO radical	IC50 (μg/mL) = 618.42
	Methanol extract	DPPH radical scavenging assay 100 (µg/mL)	75.7 ± 2.2	[21]
		Cupric Ion–Reducing antioxidant capacity (CUPRAC) assay 100 (µg/mL)	502.0 ± 10.4
		DPPH radical scavenging assay 200 (µg/mL)	83.8 ± 1.8
		Cupric Ion–Reducing antioxidant capacity (CUPRAC) assay 200 (µg/mL)	754.0 ± 10.2
		DPPH radical scavenging assay 400 (µg/mL)	92.0 ± 0.8
		Cupric Ion–Reducing antioxidant capacity (CUPRAC) assay 400 (µg/mL)	1475.8 ± 23.3
	Methanol extract	DPPH free radical-scavenging activity	IC50 value of 3 mg/mL	[22]
	Essential oil	Hydroxyl	IC50 (μL/mL) = 0.398 ± 0.028	[23]
		Superoxide	IC50 (μL/mL) = 0.141 ± 0.004
		Hydrogen peroxide	IC50 × 104 (μL/mL) = 2.421 ± 0.136
		Lipid peroxidation	IC50 (μL/mL) = 0.124 ± 0.003
		DPPH	IC50 (μL/mL) = 0.575 ± 0.060
	Aqueous ethanol extract	DPPH free radical	IC50 (μg/mL) = 25.30	[24]
	Methanol extract	Lipid peroxidation (% Inhibition)	Crude extract 50 µL (1.0 mg) = 56.1 Defatted extract 50 µL (1.0 mg) = 58.5	[25]
	Methanol Extract (bark)	Lipid peroxidation (% Inhibition)	Crude extract 50 µL (1.0 mg) = 70.6 Defatted extract 50 µL (1.0 mg) = 68.2
		Lipid peroxidation (% Inhibition) Fruit	Crude extract 50 µL (1.0 mg) = 47.3 Defatted extract 50 µL (1.0 mg) = 40.7
	Ethanol extract	Alkyl proxy radical (ROO·) scavenging activity	L-EA-IIa-3-H2 is higher than (BHA), (BHT), and ascorbic acid	[26]
	Ethanol extract (wild L. nobilis)	DPPH	IC50 (μg/mL) = 22 ± 0.531	[27]
		Lipid peroxidation	IC50 (μg/mL) = 115 ± 0.831
		β-Carotene bleaching test	IC50 (μg/mL) = 4 ± 0.382 for 30 min of incubation IC50 (μg/mL) = 1 ± 0.315 for 60 min of incubation
	Ethanol extract (cultivated L. nobilis)	DPPH	IC50 (μg/mL) = 29 ± 0.634
		Lipid peroxidation	IC50 (μg/mL) = 378 ± 0.752
		β-Carotene bleaching test	IC50 (μg/mL) = 8 ± 0.681 for 30 min of incubation IC50 (μg/mL) = 7 ± 0.543 for 60 min of incubation
	Alcoholic extract	DPPH•	ID50 (μg/mL) = 5.9–21.9 & >100	[28]
		ABTS•	ID50 (μg/mL) = 0.5–37 & >100
		ROO•	ID50 (μg/mL) = 1.6– >5
	Essential oil	DPPH assay	53%	[29]
		β-carotene-linoleic acid assay	44%
	Aqueous ethanol (Pressurized Liquid Extract)	Oxygen Radical Absorbance Capacity (ORAC) Assay	97.27 ± 2.01 µmol TE g−1	[30]
		DPPH Radical Scavenging Assay	73.51 ± 0.22 µmol TE g−1
		Ferric Reducing Antioxidant Power (FRAP) Assay	311.10 ± 5.67 µmol TE g−1
	Acetone extract	DPPH assay	IC50 (mg/mL) = 0.02 ± 0.00 (p < 0.05)	[17]
	Methanol extract	Antioxidative potential of lipid-lowering extracts (LLEs) via DPPH assay	IC50 UMH LLE = 4.69 µg/mL IC50 MH LLE = 3.45 µg/mL moist-heated (MH) and un-moist-heated (UMH)	[31]
	Essential oil	Hydroxyl	IC50 (µL/mL) 0.354 ± 0.02	[32]
		Superoxide	IC50 (µL/mL) 0.133 ± 0.01
		Lipid Peroxidation	IC50 (µL/mL) 0.101 ± 0.05
		DPPH	IC50 (µL/mL) 0.489 ± 0.07
Antimicrobial	Essential oil (Fruits)	Headspace solid-phase micro-extraction (HS-SPME) and gas chromatography coupled to mass spectrometry (GC–MS)	Listeria monocytogenes ATCC19117 (LM) L. innocua ATCC33090 (LI), L. welshimeri ATCC43548 (LW), L. ivanovii ATCCBAA-678 (LL), L. grayi ATCC25400 (LG) Vibrio parahaemolyticus ATCC33847(VP)	[33]
	Methanol extract, * moist-heated leaves (MH) and unmoist-heated (UMH)	Mueller–Hinton broth was used as the microdilution broth to determine the MICs of the UMH and MH LLEs against H. pylori	Mean Inhibition Zone (mm) UMH = 23.67 ± 0.58 MH = 26.00 ± 0.0	[31]
			MIC (µg/mL) UMH = 7.8 ± 0.1 MH = 1.9 ± 0.17
			MBC (µg/mL) UMH = 7.8 ± 0.35 MH = 1.9 ± 0.1
	Acetone extract (Flavonoid glycosides)	Broth MIC testing against	MRSA MIC (µg/mL) = 0.5 VRE MIC (µg/mL) = 4.0	[34]
	Acetone extract	Mueller–Hinton broth (CSMHB), MH broth supplemented with CaCl2 (50 mg/mL) and MgCl2 (25 mg/mL), by a microdilution method	Reduced the MICs in MRSA	[35]
	Acetone extract	Inhibition zone test in Helicobacter pylori	24 ± 0.3	[36]
	Hexane extract	Inhibition zone test in Helicobacter pylori	26 ± 0.1
	Acetone extract	MIC test in Helicobacter pylori	1:4096
	Hexane extract	MIC test in Helicobacter pylori	1:2048
	Methanol extract	Anti-QS zone	10 mm	[37]
		Anti-QS potential	++
		Pseudomonas motility	Twitching diameter 15 ± 0.01 (mm) Swimming diameter 05 ± 0.01 (mm) Swarming diameter 05 ± 0.03 (mm)
	Essential oil.	Disc-Diffusion Assay	Escherichia coli ATCC 25922 MIC = 1.0 MLC = 1.0	[32]
			Proteus mirabilis ATCC 25933 MIC = 1.0 MLC = 1.0
			Salmonella typhimurium ATCC 700408 MIC = 1.0 MLC = 2.0
			Pseudomonas aeruginosa ATCC 27853 MIC > 4.0 MLC > 4.0
			Bacillus subtilis ATCC 6633 MIC = 0.5 MLC = 1.0 Staphylococcus aureus ATCC 29213 MIC = 0.5 MLC = 1.0
			Listeria monocytogenes ATCC 13932 MIC = 0.5 MLC = 1.0.
			Candida albicans MIC = 1.0
			Trichophyton rubrum MIC = 1.0
			Aspergillus niger MIC = 1.0
	Essential oil	Broth microdilution	MIC/MBC in 7H9 broth (mg/mL) Mycobacterium avium = 12.8/6.4 M. intracellulare = 12.8/6.4 M. gordonae = 3.2/1.6	[38]
			MEC in sterilized tap water (mg/mL) = 25.6
	Essential oil	Diffusion of the antibacterial compound in the solid medium in a Petri dish	Five bacterial strains were Enterococcus faecalis ATCC 29212, Escherichia coli ATCC 25922, Enterobacter cloacae ATCC 13047, Klebsiella pneumoniae ATCC 700603, and Proteus mirabilis ATCC 49452. Effective (p ≤ 0.05)	[39]
	Ethanol extract	Solid Potato Dextrose Agar (PDA)	The fungal strain: Fusarium sporotrichioides: Effective dose-dependent (p ≤ 0.001)	[40]
		Medium microdilution broth susceptibility assay	E. coli O157:H7 MIC50 (µL/mL) = 12.5
			Yersinia enterocolitica O9 MIC50(µL/mL) = 6.25
			Proteus spp. MIC50 (µL/mL) = 3.125
			Klebsiella pneumoniae MIC50 (µL/mL) = 6.25
	Essential oil	Standard disc diffusion assays.	Anti-Aspergillus niger Zone of hyphae inhibition (mm) = 25 Zone of spore inhibition (mm) = 32 (512 × 104)	[41]
	Aqueous extract	Agar well diffusion method (Antibacterial activity)	S. aureus = MIC (µg/mL) = 2.014 ± 0.4 P. aeruginosa = MIC (µg/mL) = 2.120 ± 0.6	[42]
	Extract of L. nobilis (Ln-ZnO NPs)	Agar well diffusion method (Antibacterial activity)	S. aureus MIC (μg/mL) = 1.775 ± 0.3 P. aeruginosa = MIC (µg/mL) = 1.998 ± 0.7
	Hydroalcoholic extract	Method of Mann and Markham, using resazurin as a viability indicator	E. coli, Bactericidal MIC (mg/mL) = 25, MBC (mg/mL) = 50	[43]
			S. aureus, Bactericidal MIC (mg/mL) = 1.56, MBC (mg/mL) = 3.12
			L. monocytogenes, Bactericidal MIC (mg/mL) = 6.25, MBC (mg/mL) = 12.5
			P. aeruginosa, Bacteriostatic MIC (mg/mL) = 100, MBC (mg/mL) ≥ 100
			B. cereus, Bactericidal MIC (mg/mL) = 0.5, MBC (mg/mL) = 0.5
			S. enterica, Bactericidal MIC (mg/mL) = 6.25, MBC (mg/mL) = 6.25
	Essential oil	Macrodilution method	Antifungal activity MIC (µL/mL) = 10–40 MFC (µL/mL) = 10–50	[44]
	Essential oil	Microdilution technique in broth medium (MIC)	MIC (µg/mL) = 256	[45]
		Minimal fungicidal concentration (MFC)	MFC (µg/mL) = 512 and 1024
	Essential oil	Combined with carrier oils, the broth microdilution method for Gram-negative bacteria	S. aureus MIC (mg/mL) = 1 S. aureus (MRSA) MIC (mg/mL) = 1 S. aureus (GMRSA) MIC (mg/mL) = 1 P. aeruginosa MIC (mg/mL) = 1 E. coli MIC (mg/mL) = 1	[46]
	Acylated Kaempferol glycosides	Standard methods (SM) broth (Difco Lab.)	Compounds 1–6 (MIC) values in the range of 0.65–2.08 μg/mL.	[47]
	Essential oil	The technique of paper disc diffusion	S. aureus inhibition zone 13.6 mm	[48]
			S. faecalis inhibition zone of 11.2 mm
Antiparasitic	Acetone extract	Babesia fluorescent assay	Babesia bovis IC50 (μg/mL) = 86.6 ± 8.2 B. bigemina IC50 (μg/mL) = 86.6 ± 8.2 B. divergens IC50 (μg/mL) = 62.2 ± 3.3 B. caballi IC50 (μg/mL) = 34.5 ± 7.5 Theileria equi IC50 (μg/mL) = 82.2 ± 9.3	[49]
	Smoke and Incense of leaves and fruits		Insect repellent; Insecticide Aphidicidal activity against Brevicoryne brassicae	[50]
	Essential oil		Repellency against Tenebrio molitor larvae
	Essential oil		Insecticidal against adult Sitophilus zeamais
	Essential oil (branches, leaves)		Repellency and toxicity against Rhyzopertha dominica and Tribolium castaneum Repellency against Aedes aegypti Insecticidal against adult Sitophilus zeamais
	Essential oil (Fresh foliage)	Against Culex pipiens (Test apparatus)	Effective	[51]
Anti-inflammatory	Essential oil	MTT assay Electrophoretic mobility shift assay (EMSA)	Inhibition of NFκB/DNA binding	[52]
	Essential oil	20 µL of EOs and 20 µL of 5-LOX from Glycine max (100 U/mL), which was followed for 3 min at 234 nm.	5-Lipoxygenase = 48.31 ± 0.07	[32]
	Zaluzanin C, a sesquiterpene lactone from L. nobilis leaves	Western Blot Assay for homogenizing cells with RIPA (radioimmunoprecipitation cell culture plate PCR, CFX Connect Real-Time PCR Detection System	Zaluzanin inhibits LPs-induced ROS production in immortalized Mouse Kupffer Cells (ImKCs) and reduces ROS-induced NF-kB signaling, thereby improving inflammation.	[53]
	Absolute ethanol extract	Murine OmniKine™ IL-6 ELISA Mouse Cytokine Antibody Arrays (Product Code: AAM-CYT-1000) Ray Biotech	RAW 264.7 cells + 1 μ/mL LPS IC50 (μg/mL) = 92.6 BV-2 microglia cells + 1 μg/mL LPS IC50 (μg/mL) = 34.2	[54]
Antidiabetic	Acetone extract	Inhibits the methyl glyoxal-mediated development of fluorescence of bovine serum albumin (BSA)	IC50 (mg/mL) = 0.08 ± 0.00	[17]
	Hydroalcohol & aqueous extract	Electrophoretic migration in native conditions Spectrofluorimetric measure	Most potent inhibitory effect at the early stages of the glycation process	[55]
	Methanol extract	The α-glucosidase inhibitory potential of the Lipid-Lowering Extracts (LLEs) was assessed using the method outlined by Pistia-Brueggeman and Hollingsworth.	α-glucosidase IC50 of the UMH LLE (18.36 µg/mL) IC50 of the MH LLE (9.9 µg/mL)	[31]
	Essential oil		α-Amylase = 42.51 ± 0.012 α-Glucosidase = 1.347 ± 0.021 Lipase = 21.23 ± 0.021	[32]
Enzyme inhibition	Ethanolic fraction & Essential oil	Enzymatic activity was measured using an adaptation of the method described	Acetylcholinesterase inhibition inhibition value = 48.4 ± 6.9% (0.5 mg/mL) and 64.3 ± 9.0% (1 mg/mL) inhibition value = 51.3 ± 1.7% (0.5 mg/mL)	[56]
	Essential oil	The absorbance of the mixture was measured at 412 nm in a UV-visible spectrophotometer.	AChE inhibitory activities IC50 (µg/mL ± SEM) = 89.44 ± 0.07	[32]
	Methanol extract	Inhibition of Butyrylcholinesterase (BChE) was assessed following the Ellman method with certain modifications.	Butyrylcholinesterase Inhibition IC50 UMH 28.92 µg/mL IC50 MH 17.30 µg/mL	[31]
	Acylated kaempferol glycosides	Fluorometric method	Na+/K+-Adenosine Triphosphatase in compounds 1–6 IC50 values in the range of 4.0 ± 0.1–10.4 ± 0.6 μM	[47]
	Crude extract	Spectrophotometric method	Urease inhibitory IC50 48.69 µg/mL	[57]
	Aqueous extract	Spectrophotometric method	Xanthine oxidase inhibition % of inhibition = 14.0	[58]
	Essential oil	HPLC–UV	Inhibitors of peroxynitrite-induced tyrosine nitration inhibition = (91% at 300 Ag/mL)	[59]
Cytotoxicity	----	African green monkey kidney (Vero) cell line Adenocarcinoma cervical cancer (HeLa) cell line	IC50 of 124.1 μg/mL ± 18.26 IC50 of 34.46 ± 0.48 μg/mL	[60]
	Aqueous extract	Mouse peripheral blood cell micronucleus test	Polychromatic/normochromic erythrocyte (PCE/NCE) ratio between the treatments. Antiproliferative effect (PCE/NCE) ratio = 0.017 (p < 0.05)	[61]
	Zinc oxide nanoparticles (Ln-ZnO NPs)	(IC50) value was evaluated using an MTT [3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide] assay	HepG2 (liver cancer) and MCF-7 (breast cancer) cells have the potential to control human lung cancer cells.	[62]
	Methanol extract	The resazurin reduction assay	drug-sensitive parental CCRF-CEM leukemia cells IC50 (µg/mL) = 3.47 ± 1.72	[61]
			Multidrug-resistant P-glycoprotein-overexpressing subline, CEM/ADR5000 IC50 (µg/mL) = 5.93 ± 0.9
	Essential oil	MTT (Tetrazolium blue) colorimetric assay Electrophoretic mobility shift assay (EMSA)	L929sA cells IC50 ± S.D. (µg/mL) = 175 ± 13	[52]
	Costunolide	MTT assay	Costunolide (CTL) effect on cell growth in four breast cancer cell lines (SK-BR-3, T47D, MCF-7, and MDA-MB-231), as well as in MCF10A, normal mammary epithelial cells, was investigated.	[63]
	Cinnamtannin B-1 (CTB-1)	Radioimmunoprecipitation Assay (RIPA) (western blotting) lysis buffer (Beyotime). The protein concentration was quantified using the Bicinchoninic Acid (BCA) kit 5-Ethynil-2′-deoxyuridine (EdU) Assay.	Regulating the miR-1281/PPIF: A mechanism and abnormal expression of microRNAs (miRNAs) in HOS cells CTB-1 effect on the proliferation, migration, and invasion of Os.	[64]
	Costunolide	Cell viability assay. Assay for β-hexosaminidase release from RBL-2H3 cells. Measurement of IL-4 mRNA expression by reverse transcription-polymerase chain reaction (RT-PCR).	Rat basophilic leukemia (RBL-2H3) cells inhibit β-hexosaminidase activity (p < 0.01) (RT-PCR) = (IC50) was 34 µM	[65]
		3-(4,5-dimethylthiazol-2-yl) 2,5-diphenyl tetrazolium bromide (MTT) assay	Y16 pro-B cell viability and growth were dose-dependently suppressed in IL-5-stimulated Y16 cells
	Absolute ethanol	Resazurin 7-Hydroxy-3H-phenoxazin-3-one 10-oxide (Alamar Blue) indicator dye	RAW 264.7 cells + 1 μ/mL LPS BV-2 microglia cells + 1 μg/mL LPS LC50 (μg/mL) = 537.0	[54]
Anti–genotoxic activity	Water extract	Eye white/white+ (w/w+) Somatic Mutation, Recombination Test (SMART) assay of Drosophila melanogaster.	Laurel at 3% (w/v) showed an inhibitory effect of 30% (p < 0.01)	[66]
	Aqueous extract	Allium cepa assays	No genotoxicity detected.	[61]
Antihypertensive	Magnolialide from the combined MeOH and CH2Cl2 extract	Rat IL-4 Platinum ELISA kit Reverse Transcription-Polymerase Chain Reaction (RT-PCR) MTT assay	β-hexosaminidase release (IC50 ± SD, μM) = 20.2 ± 4.9 IL-4 production (IC50 ± SD, μM) Release = 18.1 ± 4.1 mRNA expression = 15.7 ± 3.1 IL-5-dependent proliferation (IC50 ± SD, μM) = 18.4 ± 4.2	[67]
Neuronal activity	Lindoldhamine (LIN)	Using two-electrode voltage-clamp electrophysiological recordings from Xenopus laevis oocytes.	Positive allosteric modulator of human, but not rat, ASIC3 channels.	[68]
Anti-skeletal Muscle Atrophy	Methanol extract	Induction of skeletal muscle atrophy with dexamethasone in vitro in cell culture method (DEX-Induced Skeletal Muscle Cell Injury in L6 Myotubes)	Laurel suppresses the upregulation of atrogin-1/MAFbx and MuRF1 mRNA to 12.8% and 33.6%. Also Suppresses the Expression of Muscle-Specific Ubiquitin Ligases in C2C12 Myotubes.	[64]

* MH = Autoclaved dried leaves, UMH = Non-autoclaved dried leaves, ++: Potent antiquorum sensing activity.

and

Table 3. In vivo pharmacological screening of Laurus nobilis L.

Activity	Extract	Method/Assay	Outcome	Ref.
Analgesic	Essential oil	Tail-flick test in rats rota-rod apparatus	Antinociceptive activity/Assessment of sedation and motor impairment + (doses of 0.03 mL/kg)	[69]
Anti-anxiety	Dried extract	Plasma cortisol levels in thirty healthy Tunisian volunteers aged between 20 and 57 years (during 10 days)	Plasma concentrations of serum cortisol D0 = 93.5 ± 43.01 ng/mL D11 = 72.23 ± 25.37	[70]
Anti-skeletal Muscle Atrophy	Extraction of herb samples in methanol	DEX-induced skeletal muscle atrophy model rats. Healthy male Wistar rats (8 weeks old)	evaluating changes in the expression of autophagy-related genes (Bnip3 and Lc3), an mTORC1 activity suppressor (Redd1), and key transcription factors (Klf15, Foxo1, and Foxo3) in the tibialis anterior and gastrocnemius tissues.	[71]
Antioxidant	Ethyl acetate	Sprague–Dawley rats blood samples	LNE (200 mg kg−1 body wt.) TAC (mM Trolox equivalent L1) = 5.3 + 0.7 TOS (mM H2O2 equivalent L1) = 5.6 + 1.1	[72]
			LNE + AlP TAC (mM Trolox equivalent L1) = 3.3 + 0.6 TOS (mM H2O2 equivalent L1) = 7.4 + 1.1
Anti-inflammatory activity	Essential oil	In acute inflammation, Formaldehyde 2.5% was used as an inflammagen. Chronic inflammation was induced in rats by subplantar injection of 2.5% formaldehyde.	+ dose-dependent manner (0.2 mL/kg)	[69]
	Essential oils	Rat model of carrageenan-induced paw edema. The paw volumes of the tested rats were recorded using a LE 7500 digital plethysmometer controlled by SeDaCOM software.	T0 = 0.89 After 6 h = 1.19 % inh = 70.59	[32]
	Dried bay leaves	Dextran sodium sulfate (DSS) was used to induce conditions resembling ulcerative colitis (UC) and epithelial damage in 32 albino male rats. This induction led to the manifestation of ulcerations characterized by extensive neutrophil infiltration, serving as indicative markers for inflammatory bowel disease (IBD).	Changes in body weight gain (BWG%) of rat models 1% bay leaves = 2.18 2% bay leaves = 1.98 3% bay leaves = 4.32 Control (−ve) = 3.37 Control (+ve) = −4.48	[73]
Anti-parasite	Acetonic leaf extract	B. microti–infected BALB/c mice	Conc = 6 × IC50 Parasitemia level suppressed = 56.1%	[49]
	Essential oil	Molluscicidal activity in Artemia salina L.	LC50 (μg/mL) = 89.88	[74]
	n-Hexane extract	Brine shrimp bioassay	LC50 (ppm) = 662.71	[75]
	Aqueous extract	Biomphalaria glabrata embryos	Flower LD50 = 34.3 ppm Leaves LD50 = 124.4 ppm	[76]
		Biomphalaria glabrata adult snail	Flower LD50 = 242 ppm Leaves LD50 = 1219 ppm
Antimicrobial	Extract	Listeria monocytogenes and Vibrio parahaemolyticus in silver carp	MIC and MBC tests	[77]
	Essential oils	Antifungal effects on Saprolegniasis in rainbow trout eggs during the incubation period	82.11% and 79.87%	[78]
	Essential oils	Forty-five fish (3.52  ±  0.01 g) were fed for 90 days with the diet containing laurel	Lactic acid bacteria (LAB) count in fish = Increased total coliform and E. coli reduced	[79]
Cytotoxicity	Acetone extracts	Brine shrimp cytotoxicity assay	LD50 (μg/mL) = 1100 ± 4.92	[17]
	Essential oil	Brine Shrimp Lethality Assay.	No toxicity	[46]
	Crude hexane/ethyl acetate fractions	WI38VA cell line: MTT-assay	LD50 of 10 µg/mL.	[80]
	Bay Leaf	Rat Cytokine Antibody Arrays (C6 Glioma: 3 µg/mL LPS + 30 ng/mL IFNγ) ELISA	IC50 (µg/mL) = 156 LC50 (µg/mL) = 626	[54]
	Cinnamtannin B-1 (CTB-1) from L. nobilis	Xenograft assays Xenograft Mouse Model	Samples from the TB-1 group exhibit a reduction in PPIF (Peptidylprolyl Isomerase F) expression and an increase in miR-1281 (microRNA-1281) expression.	[64]
Genotoxicity	Ethyl acetate extraction	LNE (200 mg/kg bw)	Number of MNPCE per animal 0.44 + 0.21 Number of CAs per animal 1.69 + 0.48	[72]
		LNE + AlP	Number of MNPCE per animal 2.35 + 0.86 Number of CAs per animal 3.11 + 0.94
Antidiabetic	Acetone extract	bovine serum albumin (BSA)-glucose antiglycation	IC50 (mg/mL) = 0.08 ± 0.00	[17]
	Ethanol extract	Female albino rats treated with Depakene	HbA1c mg/dL 5.36 ± 0.15 Glucose mg/dL 88.00 ± 2.64	[81]
		Blood glucose levels (mg dL−1), with 32 male Wistar rats	Diabetic group treated with L. nobilis: 287.33 ± 109.83 Laurus nobilis treated group 140.00 ± 7.29	[4]
Hepato & GI	Methanol extract	Cervical dislocation method Rat hepatic marker enzymes lipid profile	Paracetamol + MELN (200 mg/kg body wt.) AST (IU/L) = 140.77 ± 11.46 ALT (IU/L) = 63.47 ± 5.17 ALP (IU/L) = 159.73 ± 15.94 GGT (IU/L) = 6.14 ± 0.41 Bilirubin (mg/dL) = 1.63 ± 0.11	[82]
			Paracetamol + MELN (400 mg/kg body wt.) AST (IU/L) = 128.43 ± 12.13 ALT (IU/L) = 35.12 ± 3.24 ALP (IU/L) = 131.42 ± 12.34 GGT (IU/L) = 3.89 ± 0.32 Bilirubin (mg/dL) = 1.33 ± 0.03
			Paracetamol + MELN (200 mg/kg body wt.) Total cholesterol = 6.14 ± 0.43 Triglycerides = 6.71 ± 0.36 Phospholipids = 8.74 ± 0.95 Free Fatty acids = 10.88 ± 1.08
			Paracetamol + MELN (400 mg/kg body wt.) Total cholesterol = 5.49 ± 0.38 Triglycerides = 4.44 ± 0.55 Phospholipids = 21.68 ± 1.89 Free Fatty acids = 9.82 ± 0.90
	Ethanol extract	Costunolide was given orally to starve rats.	Based on the inhibition of gastric emptying and dilution of the ethanol concentration due to increased gastric fluid volume (mucus, pepsin)	[83]
	Aqueous extract	Antidiarrheal test < white blotting paper	Diarrhea inhibition 61% [EC50] = 150 − 6.4 mg/kg	[84]
		Anti-entero-pooling test < the method of Robert et al.	Entero-pooling inhibition 55% EC50 = 162 − 5.9 mg/kg
		Gastrointestinal motility > charcoal meal method	Intestinal Motility inhibition 40% EC50 = 71 − 5.3 mg/mL
	Aqueous extract (Fruit)	The cytoprotective method of Robert et al.	83.8% inhibition of EtOH-induced ulcerogenesis in rats	[85]
	Aqueous extract and oily fraction of seeds	Male albino mice (Mus musculus)	20% aqueous extract group 1,2,3> +, 20 and 40% aqueous extract group 1,2,3> +, Pure olive oil group Mixture of olive oil and seed oil group 1,2,3> +	[86]
	Essential oil	Female rats	ALP (U/L) = 68.00 ± 4.94 ALT (U/L) = 27.33 ± 1.87 AST (U/L) = 63.00 ± 4.31 Amylase (U/L) = 1106.33 ± 63.99 TP (g/L) = 61.67 ± 1.11 GLU (mmol/L) = 5.43 ± 0.27	[87]
	Ethanol extract	Female albino rats treated with Depakene	ALT IU = 42.00 ± 3.61 AST IU = 144.00 ± 3.00	[81]
Kidney	Methanol extract	Cervical dislocation method	Renal function markers Paracetamol + MELN (200 mg/kg body wt.) Urea (mg/dL) = 41.25 ± 2.98 Uric acid (mg/dL) = 2.85 ± 0.70 Creatinine (mg/dL) = 1.36 ± 0.04	[82]
			Renal function markers Paracetamol + MELN (400 mg/kg body wt.) Urea (mg/dL) = 33.81 ± 2.33 Uric acid (mg/dL) = 2.67 ± 0.16 Creatinine (mg/dL) = 0.89 ± 0.08
			Lipid profile Paracetamol + MELN (200 mg/kg body wt.) Total cholesterol = 6.17 ± 0.57 Triglycerides = 6.17 ± 0.57 Phospholipids = 7.04 ± 0.09 Free Fatty acids = 7.11 ± 0.75
			Lipid profile Paracetamol + MELN (400 mg/kg body wt.) Total cholesterol = 5.45 ± 0.54 Triglycerides = 5.74 ± 0.74 Phospholipids = 20.27 ± 2.53 Free Fatty acids = 5.39 ± 0.92
	Essential oil	Female rats	UREA (mmol/L) = 5.67 ± 0.21 Creatinine (mol/L) = 30.67 ± 0.92	[87]
	Ethanol extract	Female albino rats treated with Depakene	Urea (mg/dL) = 45.67 ± 1.53 Creatinine (mg/dL) = 0.26 ± 0.02	[81]
Blood	Methanol extract	Cervical dislocation method	Plasma (mmol/dL) Paracetamol + MELN (200 mg/kg/body wt.) TBARS = 0.43 ± 0.05 Lipid hydroperoxides = 22.45 ± 2.71	[82]
			Plasma (mmol/dL) Paracetamol + MELN (400 mg/kg body wt.) TBARS = 0.22 ± 0.02 Lipid hydroperoxides = 19.31 ± 1.95
			Erythrocyte Paracetamol + MELN (200 mg/kg body wt.) SOD (U/mg Hb) = 4.23 ± 0.22 CAT (U/mg Hb) = 145.31 ± 7.91 GPx (U/mg Hb) = 9.54 ± 0.49
			Erythrocyte Paracetamol + MELN (400 mg/kg body wt.) SOD (U/mg Hb) = 4.53 ± 0.42 CAT (U/mg Hb) = 155.81 ± 14.97 GPx (U/mg Hb) = 10.34 ± 0.09
	Ethanol extract	Blood samples, rats, Blood-ethanol elevation Costunolide/Alpha-methylene- γ-butyrolactone (alpha-MGBL)	Based on the inhibition of gastric emptying and dilution of the ethanol concentration by the increased gastric fluid (mucus, pepsin)	[83]
Wound healing	Aqueous extract	Sprague–Dawley rats	Excision wound Day 15 = 48.0 ± 4.33 p < 0.001 A moderate reduction in the wound area (p < 0.05) was observed, accompanied by a slower rate of epithelialization (11.7 ± 0.15).	[88]
	Aqueous extract	The dorsal skin of the mice was carefully shaved, and a full-thickness excision wound was surgically created.	Wound area relative to the control ± S.D. (n) 5 days = 1.22 ± 0.33 16 days = 0.56 ± 0.30	[52]
Anti-amnesic	Aqueous extract	The Morris water maze (MWM) tests and the Y maze in rats. Test in mice with scopolamine-induced memory impairments.	In brain tissues, the levels of biomarkers, enzyme activity, and protein expression related to the cholinergic system were measured.	[18]
Anti atherogenic	Essential oil	Lipid Parameters and Atherogenic Risk Predictor Indices (ARPI) Calculation. The non-hemolyzed serum was used to analyze TC, TG, HDL-C, and LDL-C concentrations.	TC (mmol/L) = 1.40 ± 0.04 TG (mmol/L) = 0.93 ± 0.09 HDL-C (mmol/L) = 0.57 ± 0.02 LDL-C (mmol/L) = 0.07 ± 0.02 VLDL-C (mmol/L) = 0.18 ± 0.02 ARI (AC) = ((TC-HDL-C)/HDL-C) = 0.19 ± 0.02 ARPI-1 (AIP) = (log (TG/HDL-C)) = 0.212 ± 0.04 ARPI-2 = (LDL-C/HDL-C) = 0.122 ± 0.00 ARPI-3 (CRR) = (TC/HDL-C) = 2.441 ± 0.09 CPI = HDL-C/LDL-C = 8.190 ± 0.34 IR = TG/HDL-C = 1.63 ± 0.07	[87]

, unveiling the results of earlier in vitro and in vivo studies [17,18]. The plant’s diverse chemical constituents contribute to an extensive array of pharmacological effects, encompassing its phytotherapeutic performance.

A study on Moroccan bay laurel confirmed high levels of phenolic acids and minerals, reinforcing its antioxidant potential [16]. Moreover, the study has highlighted the presence of lignans and triterpenoids in various plant parts, which may contribute to its anticancer potential [16]. The therapeutic synergy between these compounds underscores the importance of whole-plant extracts in traditional and modern phytotherapy. Moreover, the synergistic effects of these compounds enhance the efficacy of whole-plant extracts, making L. nobilis a valuable candidate for natural antimicrobial formulations [16]. The summary of collected clinical and pharmacological data on activities associated with L. nobilis [17,18] is presented in Table 2 and Table 3, unveiling the results of earlier in vitro and in vivo studies. The plant’s diverse chemical constituents contribute to an extensive array of pharmacological effects, encompassing its phytotherapeutic performance.

4. Potential Health Effects of L. nobilis

4.1. Removal of Dental Plaque Among Tobacco Chewers

A study suggests that crushed bay leaf powder may provide a simple means of reducing dental plaque among tobacco chewers, thereby supporting oral hygiene. Similarly, bay leaf extracts have been reported to exhibit potential tooth-whitening effects, possibly owing to their antimicrobial, antifungal, and antioxidant properties [89].

4.2. Modulation of Blood Glucose and Lipid Profile in Type 2 Diabetes

A previous investigation involving patients diagnosed with type 2 diabetes mellitus assessed the effects of daily administration of L. nobilis leaf powder at doses of 1 g, 2 g, or 3 g, compared with placebo, over 30 days. Significant decreases in total cholesterol, triglycerides, low-density lipoprotein cholesterol, and fasting blood sugar levels were evident across all treatment groups, accompanied by an elevation in high-density lipoprotein cholesterol. The absence of a clear dose-dependent trend suggests that even lower doses may confer therapeutic benefits [90]. Additionally, a pilot investigation employing a randomized, double-blind, placebo-controlled design (n = 62; 10-day intervention) tested L. nobilis tea in healthy volunteers and reported effects on lipid parameters and oxidative stress biomarkers [91]. Furthermore, the aqueous and methanolic extracts of 15 widely recognized traditional herbal formulations used for diabetes management were evaluated for their inhibitory activity against α-amylase and α-glucosidase. Among these formulations, the preparation containing L. nobilis demonstrated notable efficacy, inhibiting both α-amylase and α-glucosidase by 27% [92].

4.3. Antioxidant and Anti-Inflammatory Properties

The monoterpene 1,8-cineole, derived from bay leaf essential oil, has been clinically investigated for its therapeutic potential in alleviating respiratory distress. In a randomized, double-blind, placebo-controlled trial, its anti-inflammatory efficacy was assessed in individuals with steroid-dependent bronchial asthma [93]. Participants with severe asthma received oral doses of 1,8-cineole (200 mg, three times daily) over 12 weeks. Compared to the placebo group, those who received 1,8-cineole demonstrated a remarkable decrease in the requirement for glucocorticosteroid-sparing agents, without any symptoms of impaired pulmonary function. A 2025 study using both experimental and computational approaches demonstrated that L. nobilis extracts exhibit potent antioxidant activity and inhibit enzymes involved in inflammation and oxidative stress. While primarily in vitro, the findings support its potential in managing oxidative-related disorders [15]. In addition, empirical evidence demonstrates that the ethanolic extract of L. nobilis exhibits notable anti-inflammatory and regenerative effects on spinal cord injuries when incorporated into a gelatin scaffold [94]. In vivo evaluation revealed marked improvements in motor performance and histological recovery after 8 weeks in the L. nobilis extract-treated group. The scaffold effectively protected adipose-derived stem cells (ADSCs) from oxidative injury, an effect plausibly attributable to the polyphenolic constituents of the extract. The principal non-volatile phenolics of L. nobilis, which embody the core structural frameworks underlying its diverse therapeutic activities, are illustrated in Figure 2. These constituents, including epicatechin, caffeic acid, apigenin, kaempferol, and quercetin, exert potent antioxidant effects by neutralizing hydroxyl and hydrogen peroxide radicals, consistent with the enhanced radical-scavenging capacity observed in the DPPH assay [95]. Furthermore, incorporation of the L. nobilis extract amplified the scaffold’s immunomodulatory capacity by downregulating NLRP3 inflammasome activation, achieved by inhibiting caspase-1 activation, suppressing interleukin-1β secretion, and preventing the formation of the ADSC pyroptosome complex [96]. The monoterpene 1,8-cineole emerged as a principal mediator of this anti-inflammatory effect, while flavonoid components of the extract may further support neuronal longevity and axonal reconstruction [97].

4.4. Dermatological and Skin Health Applications

Previous research has investigated the therapeutic significance of L. nobilis leaf hydroalcoholic extract for the management of dermatological conditions, including acne and dandruff. Its antimicrobial and anti-inflammatory properties were effective in alleviating symptoms in mild-to-moderate cases [98].

Clinical evidence indicates that L. nobilis essential oil, though highly regarded for its pronounced anti-inflammatory and analgesic properties, can occasionally elicit allergic contact dermatitis. A documented case described a 36-year-old male with no prior history of atopy who developed generalized erythematous and edematous dermatitis, predominantly affecting the back and dorsal surfaces of the legs, following massage therapy utilizing a blend of L. nobilis oil and olive oil. Comparable findings have been documented in Turkey, where occupational contact dermatitis was noted among aromatherapists exposed to laurel oil. Sesquiterpene lactones have been identified as the principal sensitizing agents responsible for positive patch test responses. Furthermore, compositional analyses of L. nobilis essential oils from different Turkish regions demonstrated qualitative and quantitative variations that may modulate their allergenic potential [99]. Finally, although L. nobilis essential oil is widely used in massage therapy, contact dermatitis has been reported infrequently, and erythema multiforme–like reactions appear to be exceptionally rare [100].

4.5. Neuroprotective and Cognitive Benefits

L. nobilis incense is commercially promoted for its purported memory-enhancing properties in Anatolia [101]. Experimental investigations assessed acetylcholinesterase (AChE) activity alongside oxidative stress markers in the hippocampus of rats. Findings demonstrated that exposure to bay leaf incense markedly mitigated scopolamine-induced cognitive deficits and hippocampal oxidative damage. These results indicate that the cognitive benefits of bay leaf are likely mediated through modulation of the cholinergic system and the activation of antioxidant mechanisms [15,101].

Among the identified bioactive constituents, 1,8-cineole represents the predominant constituent, followed sequentially by α-terpinyl acetate, α-terpineol, and sabinene (Figure 1). Previous research employing a correlational framework explored the potential association between plasma concentrations of 1,8-cineole and measures of cognitive function as well as mood. In an earlier study, human participants were subjected to the aroma of rosemary essential oil, with random assignment to exposure durations of 4, 6, 8, or 10 min before cognitive assessments. Findings indicated that 1,8-cineole could be detected in the blood serum of healthy volunteers following olfactory exposure. Notably, the compound’s plasma concentration was positively correlated with performance on cognitive tasks, with higher systemic levels of 1,8-cineole associated with improved outcomes. Given that 1,8-cineole represents the principal component of L. nobilis essential oil, it is plausible that the memory-enhancing effects observed with bay laurel may be partially attributable to this constituent [102].

Being the second principal component of laurel essential oil, α-terpinyl acetate has been shown to engage multiple molecular targets and pathways, resulting in the suppression of acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) activity, alleviating Aβ-induced neurotoxicity, counteracting hydrogen peroxide-driven oxidative stress, and displaying both antioxidant and anti-amyloidogenic effects. Therefore, this compound contributes substantially to its cognitive-enhancing properties [103].

In an earlier investigation, administration of α-terpineol, another constituent of laurel essential oil, was found to enhance neurogenesis, improve long-term memory, and reduce amyloid plaque accumulation while normalizing related biochemical parameters in male Wistar rats. The compound facilitated the formation of shorter fibrillar structures, indicative of its anti-amyloidogenic properties. Overall, α-terpineol markedly alleviated pathological alterations associated with Alzheimer’s disease [104].

Sabinene, a bicyclic monoterpene in laurel oil, markedly attenuated TNF-α and IL-6 levels in both the prefrontal cortex (PFC) and hippocampus, concurrently mitigating neuronal damage in the PFC. Collectively, these effects suggest that sabinene improves cognitive performance in lipopolysaccharide-treated mice by alleviating oxidative stress and neuroinflammatory responses, while simultaneously enhancing cholinergic signaling and the activity of molybdenum-dependent enzymes in cortical brain regions [105]. Notably, sabinene, accounting for over 8% of the major constituents in L. nobilis essential oil, may underlie the cognitive-enhancing properties of this oil, consistent with evidence from Abies koreana needle essential oil, in which a comparable sabinene content was associated with the attenuation of scopolamine-induced memory impairments in murine models [106].

4.6. Broad-Spectrum Antimicrobial and Synergistic Actions with Antibiotics

Beyond its metabolic, neuroprotective, and dermatological applications, L. nobilis exhibits broad-spectrum antimicrobial activity attributable to its essential oils and phenolic constituents. Essential oils enriched in 1,8-cineole, eugenol, and methyl eugenol (Figure 1) have demonstrated inhibitory effects against a wide range of Gram-positive, Gram-negative, and fungal pathogens, including several multidrug-resistant strains such as Escherichia coli, Salmonella abony, Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, and Kocuria rhizophila [48]. Among the volatile constituents, α-terpinyl acetate (α-TA) (Figure 1) has also been identified as a key contributor to the antimicrobial potency of L. nobilis and as well as other antimicrobial essential oils [107,108]. This p-menthane monoterpenoid demonstrated pronounced antimicrobial efficacy against Aspergillus flavus and Trichophyton rubrum at a concentration of 0.4 µg/mL. Furthermore, α-TA-containing essential oil exhibited inhibitory activity against Staphylococcus aureus and Escherichia coli at lower concentrations, whereas pure α-TA suppressed the growth of both bacterial strains [109]. The monoterpenoid tertiary alcohol, α-Terpineol, abundantly present in several essential oils such as tea tree and citrus oils, exhibits pronounced broad-spectrum antimicrobial efficacy. Its antibacterial mechanism is primarily associated with the disruption and permeability of microbial cell membranes, leading to subsequent cellular death. Moreover, α-terpineol demonstrates substantial inhibitory activity against both Gram-positive and Gram-negative bacterial species, including E. coli and S. aureus [110,111].

The demonstrated antimicrobial efficacy of L. nobilis underscores its value as a prospective source for innovative phytotherapeutic formulations designed to address infectious diseases, especially in light of the escalating challenge of antibiotic resistance.

Moreover, the synergistic interactions between L. nobilis essential oils and conventional antibiotics have been reported, suggesting that bay laurel extracts may serve as adjuvant therapies to enhance the effectiveness of existing antimicrobial regimens. Such findings underscore the plant’s relevance not only in traditional medicine but also in modern pharmacological innovation. The inhibitory characteristics of laurel essential oil on microbial growth have also been attributed to the synergistic or antagonistic effect of 1,8-cineole (Figure 1) with oxygenated terpene components of the essential oil [108]. Mechanistically, these volatile constituents compromise microbial membrane integrity and interfere with enzymatic processes, thereby exerting bactericidal and fungicidal effects [48]. Importantly, synergistic interactions with conventional antibiotics suggest that L. nobilis extracts may serve as valuable adjuvants in the management of infectious diseases. This pharmacological dimension not only reinforces the traditional use of bay laurel in treating infections but also highlights its relevance in addressing contemporary challenges such as antimicrobial resistance. In an earlier study, the essential oil of L. nobilis demonstrated the strongest synergistic interactions with all tested antibiotics, including vancomycin, ciprofloxacin, and fluconazole, yielding fractional inhibitory concentration (FIC) index values ranging from 0.266 to 0.75 against tested bacterial strains and from 0.258 to 0.266 against yeast [112].

Polymerized edible films formulated from polyvinyl alcohol and supplemented with varying concentrations (0, 5, 10, and 15%) of bay leaf extract functioned as effective protective coatings for highly perishable fruits, particularly strawberries. These films demonstrated reduced water vapor permeability, maintained high optical transparency, and achieved >99.9% blockage of UV radiation. In vivo evaluation further indicated that the film containing 15% bay leaf extract provided substantial protection to packaged strawberries, resulting in a notable 22% reduction in mass loss after six days of storage [113].

5. Uncommon Allergic Reactions of L. nobilis

Attempts to eliminate α-methylene-γ-butyrolactone from laurel extracts demonstrated that crude extract, but not the treated one, induced sensitization in guinea pigs, highlighting the removal of allergenic potential of laurel extracts through chemical modification [114]. Although rare, allergic reactions to L. nobilis have been documented clinically following dermal exposure to laurel oil, particularly in cosmetic and massage applications. Positive patch test responses to L. nobilis, Compositae mix, and sesquiterpene lactone (SL) mix confirm SLs as the principal allergens [115]. SLs, defined by a γ-butyrolactone ring with an exocyclic α-methylene group, are structurally predisposed to provoke contact allergy and cross-reactivity with Compositae plants. Compounds such as custonolide are recognized sensitizers, though chemovar variation in L. nobilis may limit detection by standard hapten mixes [116]. Case reports illustrate the clinical spectrum: one patient developed erythema, edema, and papules after laurel oil application, requiring systemic corticosteroids, with patch testing confirming laurel oil as the sole allergen [117].

Overall, laurel allergy remains uncommon, typically confined to aromatherapists or their clients predisposed to developing hypersensitivity reactions, yet sesquiterpene lactones constitute a critical determinant of sensitization in L. nobilis.

6. Biofunctional Contributions of L. nobilis Constituents

The therapeutic versatility of L. nobilis continues to captivate both ethnobotanical and biomedical communities, reflecting its deep historical roots and emerging pharmacological relevance. This review consolidates findings from diverse experimental models, highlighting the plant’s multifaceted bioactivities. A rigorous literature search across Scopus, PubMed, and Google Scholar ensured a comprehensive, clinically pertinent synthesis of the data. The exclusion of non-medical disciplines further refined the scope, enhancing the translational value of the findings.

Recent investigations have elucidated the phytochemical complexity and bioactivity of the essential oil. The volatile chemical profile of L. nobilis leaves from Palestine was characterized, revealing potent antioxidant and antimicrobial properties through molecular docking analyses, which indicated that its biological effects may be primarily associated with favorable hydrophobic interactions, facilitating complementary ligand accommodation and stable binding within the active sites of the investigated crystallographic protein targets [118]. Similarly, studies demonstrated cytotoxic effects of ethanol leaf extracts against MCF-7 breast cancer cells, as well as antibacterial activity against Staphylococcus aureus and Escherichia coli [119]. The synergistic occurrence of terpenoid constituents, including various lactones, oxides (notably 1,8-cineole), alongside monoterpenes such as linalool, camphene, and α-pinene, plays a pivotal role in conferring the potent antibacterial activity characteristic of L. nobilis essential oil [107]. The plant’s neuroprotective potential has also garnered attention. Studies identified an 8-hydroxy-3-aryl isocoumarin (Figure 3) derivative from L. nobilis that binds to TrkB receptors, enhancing synaptic plasticity and suggesting therapeutic promise for neurodegenerative conditions [15,120]. Figure 4 illustrates a comprehensive graphical overview that integrates the phytochemical, pharmacological, and therapeutic aspects of L. nobilis, thereby reflecting the central objective of this review.

The molecular architectures of the key volatile and non-volatile bioactive constituents of L. nobilis, illustrated in Figure 2 and Figure 3, highlight the structural motifs that underpin the diverse pharmacological activities of L. nobilis. These structural features, several of which are emphasized in the present review, provide a mechanistic basis for understanding the broad spectrum of its therapeutic effects.

In the biosynthesis of inflammatory mediators, 5-LOX and PGE₂ function as key regulators of the leukotriene (LT) and prostaglandin pathways, respectively. In this context, 3-aryl isocoumarins demonstrated potent dual activity by inhibiting 5-LOX in cell-free assays and suppressing PGE₂ production in HeLa cells, with a mechanistic probe indicating a mixed mode of 5-LOX inhibition [121]. These compounds also downregulated COX-2 and mPGES-1 mRNA expression, while the presence of hydroxy or methoxy substituents on the C3-aryl moiety appeared to be a critical contributor to this dual inhibitory behavior [122].

Similarly, phenolic scaffolds such as caffeic acid (Figure 3) and its phenethyl ester (CAPE) exhibit strong radical-scavenging activity and disrupt the ferric-ion redox cycling required for enzymatic catalysis, thereby functioning as redox-based inhibitors of the inflammatory enzyme 5-LOX [123].

Among the characteristic flavonoid constituents of L. nobilis illustrated in Figure 3 are apigenin, kaempferol, quercetin, and epicatechin. These bioactive compounds have attracted considerable scientific interest and have been extensively investigated through in silico and in vitro approaches, demonstrating a broad spectrum of noteworthy pharmacological activities that contribute substantially to the therapeutic potential of L. nobilis [124,125,126].

More broadly, representative phenolics and flavonoids from spices impart antioxidant, antimicrobial, preservative, and anti-inflammatory activities. Most notably, quercetin, eugenol, and structurally relevant molecules exhibited marked 5-LOX inhibitory activity in human polymorphonuclear leukocytes (PMNL). Aqueous spice extracts suppressed 5-LOX within the 0.122–1.44 mg and 25–83 µM activity ranges, and inhibitory potency showed a strong positive association with the presence of multiple phenolic or methoxy substituents [126]. Among the evaluated compounds, quercetin demonstrated the highest activity (IC₅₀ = 25 µM), closely followed by eugenol (IC₅₀ = 26 µM), underscoring the contribution of phenolic components to 5-LOX modulation [121].

Additionally, earlier research demonstrated significant antioxidant, antimicrobial, and dermatologically relevant bioactivities associated with the essential oil and hydrosol constituents of L. nobilis, underscoring the considerable potential of L. nobilis essential oil and hydrosols as multifunctional natural ingredients for skin health promotion and cosmetic applications [127,128,129]. These findings align with earlier reports of anti-inflammatory and hepatoprotective effects, reinforcing the polypharmacological profile of L. nobilis [130].

To integrate these findings into the broader biochemical architecture of Laurus nobilis, it is essential to consider the biophysical and mechanistic contributions of its major bioactive constituents to the overall therapeutic activity spectrum. L. nobilis is a rich source of terpenoids, with more than 200 identified compounds exhibiting broad pharmacological activities, including antidiabetic, anticonvulsant, immunomodulatory, anti-inflammatory, cytotoxic, antibacterial, antifungal, and antioxidant effects. Many of these actions arise from terpenoid-mediated modulation of membrane ionic permeability, GABAergic neurotransmission, and signaling pathways governing inflammation, metastasis, and apoptosis [7]. Consistent with these diverse activities, the combined physicochemical contributions of major leaf-oil terpenes, such as linalool, 1,8-cineole, camphene, and α-pinene, further underpin their antimicrobial efficacy by disrupting membrane integrity, destabilizing proteins, and inhibiting essential enzymatic processes [131].

In addition to terpenoids, phenolic compounds constitute an important component of the phytochemical profile of L. nobilis. Phenolic profiling of L. nobilis ultrasonic extracts by HPLC revealed a series of major constituents, including epicatechin, rutin, catechin, hydroxybenzoic and hydroxycinnamic acids, vanillin, kaempferol, and luteolin in descending order [132]. Phenolic compounds generally display stronger antimicrobial activity against Gram-positive bacteria, reflecting the protective outer-membrane electronegativity of Gram-negative species [133,134]. These compounds may also contribute to the anti-inflammatory activity of L. nobilis, as prior findings indicate that its leaf extract suppresses TGF-β1 signaling and inhibits NLRP3 inflammasome activation [96,132].

Similarly, flavonoids in L. nobilis, including rutin, kaempferol, naringin, and naringenin, likely underlie the cytotoxic responses observed in ES2, SAS, and HT-29 cells [135]. Naringin is particularly notable, as it enhances the chemotherapeutic cytotoxicity of paclitaxel by activating intrinsic apoptosis, inducing G1 arrest, and modulating PTEN–PI3K/Akt signaling [136].

At the molecular level, docking studies further indicate that rutin, luteolin, and galangin from L. nobilis bind favorably to α-amylase and α-glucosidase through coordinated hydrogen bonding, hydrophobic interactions, and aromatic π–π interactions. Rutin forms the most extensive interaction network due to its glycosylated structure, whereas luteolin and galangin primarily engage through hydrogen bonding and aromatic stacking. These complementary interactions support their strong binding affinities and potential inhibitory activity against carbohydrate-hydrolyzing enzymes [137].

Beyond direct interactions with specific molecular targets, the biophysical effects of phenolic compounds on biological membranes may provide an additional mechanistic framework for understanding their pharmacological actions. An earlier study demonstrated that several phenolic compounds, such as genistein, capsaicin, curcumin, resveratrol, and EGCG, can modify lipid bilayer properties and thereby influence the activity of diverse membrane proteins by preferentially localizing at the bilayer–aqueous interface. Using a gramicidin-based assay, these membrane-mediated effects were shown to be consistent across multiple protein classes, including metalloproteases as well as mechanosensitive and voltage-gated ion channels, supporting a shared bilayer-dependent mode of action [138]. Collectively, these mechanistic insights highlight the multifaceted biochemical and biophysical interactions through which L. nobilis exerts its pharmacological effects, while simultaneously underscoring the need for standardized, mechanistically informed clinical investigations.

Despite these promising outcomes, significant gaps remain. The heterogeneity of methodologies and the limited number of longitudinal human trials impede definitive conclusions regarding clinical efficacy and safety. Standardization of extract composition, dosage, and pharmacokinetics is urgently needed. Moreover, while in silico toxicity predictions are insightful, they must be corroborated by in vivo toxicological assessments [130]. Future research should prioritize randomized controlled trials and mechanistic studies to validate therapeutic claims. The integration of L. nobilis into evidence-based medicine hinges on rigorous clinical substantiation. In sum, this aromatic evergreen shrub represents a compelling phytotherapeutic candidate whose full potential awaits further scientific illumination.

7. Conclusions and Emerging Perspectives

Exploring the diverse chemical constituents of L. nobilis has revealed a range of beneficial pharmacological activities. Our literature review confirms the efficacy of this species across various domains, including wound healing, dental plaque removal, hepatoprotective and gastroprotective effects, regulation of diabetes and blood sugar levels, antioxidant and anti-inflammatory properties, potent antimicrobial effects (encompassing antibacterial and antifungal), antiparasitic and insect-repellent capabilities, neuroprotective qualities, anti-genotoxic and anti-hypersensitive effects, significant analgesic impact, anti-cancer activity, anti-histaminic properties, antidiarrheal capacities, kidney protective attributes, and much more.

Additionally, L. nobilis demonstrates significant promise as a natural therapeutic agent whose efficacy is deeply rooted in biophysical mechanisms, including membrane biomechanics, protein structural modulation, redox-driven electron transfer, and mechanotransduction. These mechanistic foundations also support its emerging applications in bioengineering, nanotechnology, and biomaterials, where L. nobilis constituents contribute to antimicrobial coatings, biopolymer reinforcement, and wound-healing matrices.

In conclusion, Laurus nobilis, supported by a well-established history of safe traditional use, emerges as a naturally derived source of both volatile and non-volatile bioactive compounds with substantial therapeutic promise. Its diverse pharmacological attributes highlight its considerable potential for further scientific investigation aimed at elucidating and expanding its role in the alleviation and management of a wide range of medical conditions and clinical symptoms, thereby offering valuable prospective therapeutic benefits.