The Effectiveness of Herbal Mixture Supplements with and without Clomiphene Citrate in Comparison to Clomiphene Citrate on Serum Antioxidants and Glycemic Biomarkers in Women with Polycystic Ovary Syndrome Willing to Be Pregnant: A Randomized Clinical Trial

This paper aimed to evaluate the effect of herbal mixture (Mentha spicata, Zingiber officinale, Cinnamomum zeylanicum, and Citrus sinensis) only and along with clomiphene citrate (CC) compared to CC on serum antioxidants, glycemic status, menstrual regulation, and rate of pregnancy. This single-blind randomized clinical trial was carried out on 60 infertile participants with polycystic ovary syndrome (PCOS) willing to be pregnant. They were randomly allocated into group 1 (n = 20) who received routine dose of CC pills (50–150 mg) for three menstrual cycles from the fifth day of menstruation for five days; group 2 (n = 20) who consumed herbal mixture daily (700 mg); and group 3 (n = 20) who used up herbal mixture along with CC for 3 months. Catalase (CAT), glutathione peroxidase (GPx), superoxide dismutase (SOD), malondialdehyde (MDA), fasting blood sugar (FBS), insulin, and homeostatic model assessment for insulin resistance (HOMA-IR) were measured in their blood samples. No statistically significant differences were observed between the three groups in terms of socio-demographic characteristics. After intervention, however, the levels of CAT in group 2 (adjusted mean difference (aMD): = 9.0; confidence interval (CI) 95% = 1.1–16.9) and group 3 (aMD = 12.2; CI 95% = 4.5–19.9), GPx in group 2 (aMD = 986.1; CI 95% = 141.1–1831.1) and group 3 (aMD = 1781.2; CI 95% = 960.7–2601.8), and SOD in group 2 (aMD = 55.1; CI 95% = 26.0–84.2) increased. While FBS in group 3 (aMD = −8.7; CI 95% = −14.7 to −2.7), insulin in group 2 (aMD = −5.6; CI 95% = −10.8 to −0.4), and HOMA-IR in group 2 (aMD = −1.3; CI 95% = −2.4 to −0.2) significantly decreased compared to the group 1. To summarize, herbal mixture supplements along with CC have beneficial effects on serum antioxidant levels, as well as glycemic biomarkers of infertile PCOS, menstrual regulation, and pregnancy rate.

activity, ferric reducing antioxidant potential (FRAP), and phytochemical analysis of herbal mixture as secondary outcome.

Medicinal Plant and Capsule Preparation
The dried plant samples consisting of the leaves of M. spicata, rhizomes of Z. officinale, bark of C. zeylanicum, and peels of C. sinensis were provided from the Herbal Medicine Market and identified at the Department of Pharmacognosy, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran. The different plant samples were thoroughly powdered and sieved. The powders were mixed with 5 (250 mg): 4 (200 mg): 3 (150 mg): 2 (100 mg) weight ratios of spearmint, ginger, cinnamon, and C. sinensis, respectively. Finally, obtained powder was used for preparation of 700 mg capsules.

Preparation of Methanolic Extract
The methanolic extract was obtained from 72 g of herbal mixture powder using the maceration method with 700 mL methanol (MeOH) during three consecutive days. The obtained extract was filtered and dried using a rotary evaporator at 45 • C. The yielded methanolic extract was 12.04 g.

Free Radical Scavenging Assay
Free radical scavenging activity of methanolic extract was measured using DPPH (2, 2-diphenyl-1-picrylhydrazyl) method. The extract was dissolved in methanol to prepare a stock solution with the concentration of 10 mg/10 mL. Serial dilutions (0.5, 0.25, 0.125, 0.625, 0.313, and 0.156 mg/mL) were made to reduce the concentrations. Two mL of diluted solution was mixed with 2 mL of 0.08 mg/mL DPPH solution and was allowed to stay for 30 min for any reaction. The ultraviolet (UV)-visible absorbance was set at 517 nm by Thermo Fisher spectrophotometer (Walthman, MA, USA). The reduction percentage was recorded against the extract concentration to compute RC50 values (the concentration of extract that provides 50% loss of DPPH activity). Quercetin was used as the positive control and the experiment was performed in triplicate [27].

Ferric Reducing Antioxidant Potential
Total antioxidant activity was determined by the ferric reducing antioxidant potential (FRAP) following the method of Benzie and Strain with some modifications. This method is based on the reduction of Fe (III)-TPTZ (ferric 2,4,6-tripyridyl-s triazine complex) by antioxidants to Fe (II)-TPTZ (ferrous form). Light blue reagent clarifies the presence of Fe (III)-TPTZ, and changing it to dark blue after interaction with antioxidants illustrates the presence of Fe (II)-TPTZ in the reagent. To this end, FRAP stock solution was prepared freshly by mixing TPTZ (10 mM), HCl (40 mM), and FeCl3 (20 mM) in an acetate buffer (300 mM, pH 3.6). Next, 900 µL of FRAP reagent was allowed to react with 30 µL of plant extract for 30 min in a test tube. The tube was vortexed and placed in bain-marie to reach 37 • C. The standard calibration curve was obtained by using different concentrations of FeSO 4 as the standard for calculation of the FRAP values for both the quercetin and herbal mixture. Afterwards, absorbance at 595 nm wavelength was monitored against control solution [28]. Finally, the result was expressed in µM Fe (II)/g dry mass and compared with that of quercetin as the standard antioxidant.

Total Phenolic Content
Total amount of the phenolic components was determined by Folin-Ciocalteau method. One mL of methanolic extract (5 mg/mL in acetone-water solution) was mixed with 200 µL of Folin-Ciocalteau reagent and 1 mL of 2% Na 2 CO 3 , and the new solution was incubated for 30 min at room temperature. Then the absorbance was determined at 750 nm using Thermo Fisher spectrophotometer. Various concentrations of gallic acid were utilized as the standard, and control samples did not contain any extract. All evaluations were performed in triplicate.

Total Flavonoid Content
Total flavonoids were determined using the AlCl 3 method. Eighty percent methanol was used as the test solution. With this end in view, 133 mg crystalline AlCl 3 and 400 mg crystalline NaCOOCH3 were dissolved in 100 mL of 80% methanol and used as an AlCl 3 reagent. To estimate the flavonoid content of extract, 2 mL of extract solution, 400 µL of water, and 1 mL of AlCl 3 reagent were mixed and the absorbance was set at 430 nm using Thermo Fisher spectrophotometer. The blank solution containing no AlCl 3 reagent and different concentrations of quercetin were used as the standard. The number of flavonoids was estimated based on the calibration curve of quercetin. All measurements were performed in triplicate.

Essential Oil Extraction
The herbal mixture powder (120 g) was exposed to hydrodistillation using a Clevenger type apparatus for about 4 h. Then, the obtained dark yellow oil was dried over anhydrous sodium sulfate, measured, and stored in a dark glass at 4 • C for further analyses. The essential oil (0.5% w/w) was assessed on the dry weight basis.

Gas Chromatography-Mass Spectrometry and Gas Chromatography-Flame Ionization Detector Analyses
Gas chromatography-mass spectrometry (GC-MS) and gas chromatography with flame ionization detector (GC-FID) analyses were performed on a Shimadzu GC-MSQP-5050A and GC-17A equipped with a DB-1 fused silica column (60 m × 0.25 mm i.d., 0.25 µm film thickness), with an oven temperature of 50 • C rising to 260 • C at a rate of 3 • C/min. The total running time for a sample was about 82 min. Helium was used as the carrier gas at a flow rate of 1.3 mL/min. The essential oil was diluted 1:100 in n-hexane and 1 µL was injected into the column. Split ratio, ionization energy, scan time, and acquisition mass range were 1:33, 70 eV, 1 s, and 30-600 amu, respectively.

Identification of Components
Identification of the essential oil components was based on the comparison of the standard alkanes (C8-C20) from Sigma-Aldrich (St. Louis, MO, USA) with the retention times and mass spectral data, and computer matching with the NIST 21, NIST 107, and WILEY 229 library by comparing the fragmentation patterns of the mass spectra with those reported in the library [29].

Clinical Trial Study
This single-blind, parallel randomized clinical trial was authorized by the Ethics Committee of Tabriz University of Medical Sciences (code: TBZMED.REC.1394.576) on 26 November 2015, and was registered in the Iranian Registry of Clinical Trials (IRCT201509295563N7) on 9 January 2016. A total of 60 women with PCOS aged 18-35 years old with primary and secondary infertility, a body mass index (BMI) between 26.5 and 28.5 kg/m 2 , and willing to be pregnant were included in the study. The participants were from the Infertility Clinic, Alzahra Hospital, Tabriz, Iran, and contributed to the study for approximately nine months (from 16 January 2016 to 25 October 2016). The diagnosis of PCOS was based on Rotterdam criteria (2003), satisfying at least two out of three of the following criteria: oligomenorrhea /or amenorrhea, clinical /or biochemical sign of hyperandrogenism, and presence of PCOS by ultrasonography [30]. The criteria for inclusion were PCOS women diagnosed with primary or secondary infertility, aged between 18 and 35 years, and having a BMI < 30. The exclusion criteria included the patients with diabetes mellitus, the use of medications such as those helping ovulation or insulin sensitizers, thyroid disorders, cholesterol-lowering drugs, smoking, current treatment of infertility, hypertension, cardiovascular diseases, Cushing syndrome, and allergy to spearmint, ginger, cinnamon, and C. sinensis.
All participants were informed about the purpose of the study, and an informed consent was obtained from each of them. They were also asked to keep their daily intake of food during three months of study. Compliance of the subjects was followed up via phone consultation every week. The subjects were randomly allocated into the three groups: group 1 (n = 20) received routine dose of CC pills (50-150 mg) for three menstrual cycles from the fifth day of menstruation for five days; group 2 (n = 20) consumed 700 mg herbal mixture capsule daily; and group 3 used up 700 mg herbal mixture capsule along with CC for three months.

Randomization
The participants were divided into three groups by random allocation software (RAS/ version 1.0.0, M Saghaei, Isfahan, Iran) [31] through randomized blocks of three and six with an allocation ratio of 1:1:1 by a person who was not involved in the study. For allocation concealment, according to sequence generation opaque and sealed envelopes numbered from 1 to 75; each contain a letter designating the allocation. The first envelope was dedicated to first participant and this process was followed to the end of the research. Only the statistician was blind to the study.

Collection of Serum Samples
Ten mL of blood samples was collected twice from antecubital veins in the morning after an overnight fasting, on the second day of the women's menstrual cycle; first, as the pre-intervention, and second, as the post intervention (three months later). The blood samples were centrifuged for 10 min at 4000 rpm to separate the serum. The extracted serum was divided into four aliquots and kept frozen at −70 • C until assay.

Measurement of Biomarkers of Oxidative Stress
Serum MDA levels were measured by thiobarbituric acid (TBA) test with ±0.01 µMol/L sensitivity. Concentration of plasma MDA was determined with a spectrophotometric detector at 532 nm. A 1,1 ,3,3 -tetramethoxypropane was used to construct the calibration curve as the standard [32] (reference value: 0.54-1.32 pg/mL). In addition, serum SOD levels were measured by colorimetric method using an ELISA kit (RANDOX, Antrim, North Ireland UK) according to the manufacturers' instruction. Sensitivity of the assay was ± 0.01 IU/mL (Cat. No. (SD) = 124; reference value: 164-240 IU/mL). Moreover, serum GPx levels were measured by UV method using the ELISA kit (RANDOX). Sensitivity of this assay was ± 1.15 IU/mL (Cat. No. RS 2318; reference value: 4171-10881 IU/mL). Furthermore, serum CAT levels were measured by immunoturbimetric assay using an ELISA commercial kit according to the manufacturers' protocol (CUSABIO Kit, WUHAN HUAMEI BIOTECH Co., Ltd. Wuhan, China). Sensitivity of the assays was ± 3.9 pg/mL (Cat. No. CSB-E13635h; reference value: 19.8-66.4 pg/mL).

Measurement of Glycemic Biomarkers
Insulin concentration was determined through a fully automated chemiluminescence assay (LIAISON C-Peptide, Byk-Sangtec; reference value: 3.21-16.32 µIU/mL) [33]. Blood glucose level (FBS) was measured by enzymatic methods using commercial kits (Pars Azemun, Isfahan, Iran) and the auto-analyzer system (Selectra E, Vitalab, Netherlands; reference value: 70-115 mg/dL). Homeostatic model assessment for insulin resistance (HOMA-IR) was calculated according to HOMA − IR = Glucose × Insulin 405 formula. It is noteworthy to mention that the 75th percentiles of HOMA-IR in the whole population, in normal-weight, and in obese people are 3.027, 1.68, and 3.42, respectively.

Ultrasonography
Volume of ovary, numbers as well as size of follicles were probed by vaginal ultrasound (5 MHz Ulramark 4 Plus; Advanced Technology Laboratories, Bothell, WA, USA).

Checklist of Side Effects
The participants were also asked to complete a checklist encompassing the side effects of medications during the intervention.

Statistical Analysis
Normality of all quantitative variables for each of the groups was confirmed using the Kolmogorov-Smirnov test. Descriptive statistics, including the frequency and percentage, and measures of central tendency and dispersion, including the mean and standard deviation (SD), were also used to describe the study variable. Moreover, the results were analyzed using one-way analysis of variance (ANOVA) with a post-hoc Tukey test for baseline quantitative variables. The paired t-test was also applied for comparison of quantitative data before and after the trial within the 3 groups, and analysis of covariance (ANCOVA) was used for between-group analysis after intervention adjusted for baseline values. p-Value ≤ 0.05 was considered statistically significant. The data were analyzed by SPSS software, version 22.0 (SPSS Inc., Chicago, IL, USA).

Preparation and Analysis of the Herbal Mixture
In this study, the total methanolic extract was obtained from the herbal mixture powder which was 12.04 g. Then, the levels of DPPH, FRAP, TPC, and TFC were measured from this methanolic extract.
Herbal mixture showed potent antioxidant activity (RC50: 0.018 ± 0.0007 mg/mL) in comparison to quercetin (RC50: 0.004 ± 0.0001 mg/mL) as the positive control; this activity could be attributed to the presence of phenolic structures in the extract. The methanolic extract of herbal mixture had the ability to decrease TPRZ-Fe (III) to TPTZ-Fe (II), and FRAP values for methanolic extract of herbal mixture was 720 ± 35 µmol Fe (II)/g, which was lower than that of quercetin (2880 ± 41 µmol Fe (II)/g) as the standard antioxidant. In addition, the assessment of TPC and TFC contents proved the presence of 24.062 ± 0.2 mg gallic acid/100 mg and 8.93 ± 0.09 mg quercetin/100 mg in herbal mixture (Table 1). The amount of extracted essential oil was 0.5% w/w, which was assessed on the dry weight basis. The GC-MS and GC-FID analysis of the herbal powder essential oil indicated that the phytochemicals of the essential oil, including sesquiterpenes and derivatives (55.49%), aldehydes (19.38%), and monoterpenes (15.45%) were the main groups of oil components. Moreover, it was shown that zingiberene (13.58%), α-curcumene (10.77%), β-sesquiphellandrene (9.86%), α-farnesene (5.30%), and β-bisabolene (5.93%), isolated from ginger with sesquiterpenes hydrocarbons, were the most abundant components in essential oil of herbal mixture powder. In the same way, cinnamic aldehyde (13.06%) was separated from cinnamon with the organic compounds of aldehyde, and pulegone (5.61%) was extracted from spearmint with monoterpene structure. No substance was extracted that could be related to C. sinensis, which might be due to its lowest dosage (Table 2, Figure 1).

Clinical Trial Data
In the present study, the initial sample consisted of 90 women with PCOS, from whom 11 were excluded because they did not meet the Rotterdam criteria, and 4 women's husbands suffered from azoospermia. Then, 75 participants were randomly allocated into 3 groups including group 1: CC (n = 25); group 2: herbal mixture (n = 25); and group 3: CC with herbal mixture (n = 25). Twenty-two women out of 25 in group 1, 23 out of 25 in group 2, and 24 out of 25 in group 3 received allocated interventions. However, 3, 2, and 1 of them in groups 1, 2, and 3, respectively, did not feel comfortable enough to participate. During the follow-up stage, 2 participants in group 1 were lost to be followed up with because of consuming other medication along with treatment, 3 of them in group 2 discontinued intervention on account of deciding to get treated with intrauterine insemination (IUI) or in vitro fertilization (IVF), and 2 of them in group 3 did not take an initial blood test, while 2 of them wanted to be treated with IUI or IVF. Finally, 60 participants (n = 20 in each group) finalized the intervention and their blood samples were analyzed at the end of three months (Figure 2). Before intervention, there were no significant differences between groups in terms of socio-demographic characteristics. The mean (SD) age was 25.7(4.1) years; the mean (SD) marital age was 20.2 (3.5) years, and the mean (SD) infertility history was 3.9 (3.0) years. Likewise, the mean (SD) weight was 73.8 (11.4) kg, and the mean (SD) BMI was 27.5 (3.8) kg/m 2 . Furthermore, the numbers of women with primary and secondary infertility were 53 (83.3%) and 7 (16.7%), respectively. None of the participants were smokers (Table 3). Before intervention, there were no significant differences between groups regarding the serum levels of CAT (p = 0.725), GPx (p = 0.751), SOD (p = 0.793), and MDA (p = 0.835). After intervention, however, with adjusting baseline values, significant differences were observed between groups in terms of CAT (p = 0.001), GPx (p < 0.001), and SOD (p < 0.001) levels except for MDA (p = 0.420). In a binary comparison, the CAT levels in group 2 (aMD = 9.0; CI 95% = 1.1-16.9, p = 0.021) and group 3 (aMD = 12.  (Table 4).  CAT: Catalase, GPx: Glutathione peroxidase, SOD: Superoxide dismutase, MDA: Malondialdehyde. p 2 × 1 Difference between groups 2 and 1 after intervention, p 3 × 1 Difference between group 3 and 1 after intervention, p 3 × 2 Difference between groups 3 and 2 after intervention. p † : Paired-Samples t-test for within-group comparison, p 0 : One-way ANOVA for between-group comparison at baseline, p 1 : Analysis of covariance for between-group comparison after intervention adjusted for baseline, * 95% CI within-group comparison. All numbers are given as mean ± SD except for those specified as mean differences (MD) or p-value. Group 1: Clomiphene Citrate (CC), Group 2: herbal mixture, and Group 3: CC with herbal mixture (Clomiphene: Control).
Before intervention, there were no significant differences between groups in terms of serum levels of insulin (p = 0.135) and HOMA-IR (p = 0.188) except for FBS (p = 0.003). After intervention, however, with adjusting baseline values, significant differences were observed in terms of FBS (p = 0.003), insulin (p = 0.029), and HOMA-IR (p = 0.017) levels. In the binary comparison, a significant decrease was seen in serum levels of FBS (aMD = −8.  Table 5).
Ultrasonography for PCOS women on the second day of menstrual cycle after three-month treatment demonstrated no significant variations in the number, size of basal antral follicle count (AFC), and volume of ovary in all three groups that were 10-12, 2-12 mm, and 10 cm 3 , respectively. In addition, sonography in the mid-cycle of the third month showed that in group 1, the antral follicles of 14 out of 20 patients reached the ovulation stage and 4 of them became pregnant (20%). While in group 2, 11 PCOS women out of 20 showed dominant follicles, 2 of which experienced the pregnancy (10%). In group 3, 17 out of 20 PCOS participants had dominant follicles (18-20 mm), which resulted in 5 pregnancies (25%; one of them was pregnant with twins).
Our results also showed that after intervention, in groups 1, 2, and 3, 35%, 22.2%, and 35% had oligomenorrhea versus 65% (p = 0.014), 55.6% (p = 0.014), and 100% (p < 0.001) at the baseline. Furthermore, after intervention, 25% of women in group 1 had amenorrhea versus 45% at the baseline (p = 0.46), and 25% in group 3 had amenorrhea versus 65% at the baseline (p = 0.005). However, after intervention, in group 2, 16.7% had amenorrhea versus 33.3% at the baseline; though the difference between the groups was not significant (p = 0.083). Meanwhile, no side effects were reported in all three study groups during the 12 weeks of intervention.  FBS: Fast blood sugar, HOMA-IR: Homeostatic model assessment for insulin resistance, p 2 × 1 : Difference between groups 2 and 1 after intervention, p 3 × 1 : Difference between groups 3 and 1 after intervention, p 3 × 2 : Difference between groups 3 and 2 after intervention. p † : Paired-Samples t-Test for within-group comparison, p 0 : One-way ANOVA for between-group comparison at baseline, p 1 : Analysis of covariance for between-group comparison after intervention adjusted for baseline, * 95% CI within-group comparison. All numbers are given as mean ± SD except for those specified as mean differences (MD) or p-value. Group 1: Clomiphene Citrate (CC), Group 2: Herbal mixture, and Group 3: CC with herbal mixture (Clomiphene: Control).

Discussion
According to our results presented in Table 1, herbal mixture showed potent antioxidant activity, as well as total phenol and flavonoid content. Based on previous studies, the antioxidant activity of extracts could mainly be attributed to the polyphenolic compounds [34]. The FRAP assay is widely used to determine the antioxidant compounds in dietary polyphenols [35]. In fact, polyphenols determine the antioxidant activity, and this positive relationship renders a trend in many medicinal plants [36]. It has been proven that cinnamon contains a great variety of flavonoids and polyphenols with free-radical-scavenging properties and antioxidant activities [37]. Ginger with a wide range of antioxidants and polyphenol compounds such as β-carotene, ascorbic acid, terpenoids, alkaloids, and polyphenols like flavonoids, flavone glycosides, and rutin is regarded the greatest source of phytochemical antioxidants [38]. Phenolic phytochemicals of spearmint significantly enhance the antioxidant defense [39]. Peel of C. sinensis is also very rich in phenolic compounds, including flavonoids and phenolic acids, which can be consumed as natural antioxidants [40].
Regarding Table 4, our results clearly showed that after a 12-week intervention, levels of CAT, GPx, and SOD significantly increased in groups 2 and 3 compared to group 1. Although a significant decrease in case of MDA was seen in groups 2 and 3, there was no significant difference in comparison with group 1. Moreover, according to Table 5, levels of FBS in group 3, and insulin and HOMA-IR in group 2 significantly decreased compared to group 1.
Many studies have indicated low serum antioxidant levels and insulin resistance in PCOS women [46][47][48]. In fact, hyperglycemia can enhance OS through numerous pathways. However, through a major non-enzymatic mechanism, it induces the intracellular ROS, generates electrochemical proton gradient produced by mitochondrial electron transport chain (mETC), and results in enhanced derivation of superoxide [49]. In addition, reactive species by impairing glucose uptake in muscle and fat [50], and also by reducing insulin secretion from pancreatic β cells play a crucial role in insulin resistance [7]. On the other hand, an imbalance between oxidant-antioxidant is responsible for ovarian disturbance, insulin resistance, and chronic inflammation that is associated with pancreatic β cell dysfunction in women with PCOS [10]. Although ROS and RNS at low concentrations play physiological roles in cellular signaling pathways, in excess levels they may damage cellular functions [6]. Reactive oxygen species react with lipids, causing them to boost peroxidation products such as MDA [47].
Cinnamon also reduces insulin resistance by enhancing phosphatidylinositol 3-kinase activity in the insulin signaling pathway [51]. In several studies, the authors proved that cinnamon contained proanthocyanidins and phenolic compounds with antioxidant activities that not only neutralized free radicals, but also reduced blood glucose and insulin [52,53]. Moselhy et al. indicated a strong hepatoprotective effect of cinnamon ethanolic extract against carbon tetrachloride (CCl4)-induced oxidative stress by increasing the SOD and CAT levels and decreasing the MDA level, the possible mechanism of which could be attributed to the free radical scavenging activity of polyphenol compounds [54]. In a study examining the effect of ginger and onion (Allium cepa) on the levels of sexual hormones and OS, the reduction of MDA serum level was significant in the within-ginger group, but was not significant in comparison to the control group; this result was in line with ours [55]. A use of the combination of ginger and cinnamon in diabetic male rats in the study of Khaki et al. particularly illustrated an increase in the SOD, CAT, and GPx levels, while the MDA level more significantly decreased compared to other groups using only one herb [17]. In an animal study, Al-Amin et al. demonstrated that ginger could decrease the FBS level by the mechanism of serotonin receptors which activate pancreatic β cells to release insulin [56]. Additionally, Bayani et al. showed that phenolic phytochemicals of spearmint possessed hypoglycemic, and antioxidant attributes [57]. Deep et al. also revealed that methanolic extract of spearmint was a more potent antioxidant than ascorbic acid, which is recognized as the standard antioxidant. Furthermore, the levels of SOD, GPx, and CAT were duplicated, while MDA level fell by half [58]. In other research, Selmi et al. approved that hesperidin as one of the main flavonoids of C. sinensis reversed lipoperoxidation and hydrogen peroxide production, reduced MDA level, and increased antioxidant status (CAT, GPX, SOD levels) drastically [59].
Volatile oil from C. sinensis peel contains naringin and naringenin as two kinds of flavonoids which have anti-diabetic and antioxidant properties [60]. Polymethoxylated flavones (PMFs) of C. sinensis have hypolipidemic effects, resulting in a significant reduction of insulin tolerance and glucose levels [61]. Furthermore, according to other research, a mixture of onion, ginger, basil, cinnamon, orange peel, yellow and red watermelon seeds, and carrot seed could significantly affect the CAT level and reduce the OS [62]. All of this research is consistent with our study.
In this study, regular menstrual cycle, ovulation, and pregnancy occurred in all three groups. The main cause of this syndrome is the reduction in the sensitivity of pre-antral follicles to follicle stimulating hormone (FSH), and enhancement of follicular activity to luteinizing hormone (LH) leading to the inhibition of follicle maturation [63]. Similarly, excessive secretion of LH and gonadotropin-releasing hormone (GnRH) stimulate ovarian theca cells to produce androgens [64]. As a consequence, hyperandrogenism not only arrests antral follicle growth, but also stimulates apoptosis of its granulose cells which convert androgen to estradiol employing aromatase enzyme [65].
The study of Khodaeifar et al. certified that cinnamon could improve ovulatory menstrual cycle by enhancing progesterone levels in the luteal phase of PCOS women [66]. Similarly, Ataabadi et al. demonstrated that spearmint, through reducing body weight and level of testosterone and having antioxidant properties, matured follicles, and induced ovulation, led to higher number of Graafian follicles and corpus lutea and lower number of ovarian cysts and atretic follicles [24]. Ginger not only stimulated blood circulation for the treatment of inflammation and menstrual irregularities, but also enhanced AFC and ovarian reserve function [67]. Clomiphene citrate stimulated ovulation and increased fertility rate via stimulating the secretion of gonadotropin-releasing hormone as well as anti-estrogenic effect [68].
The results of the present study pointed out the fact that herbal mixture could increase the serum levels of CAT, GPx, SOD, and reduce the MDA level. Likewise, CC along with herbal mixture could exert such effects. This result may contribute to the point that although CC could not alter serum level of the antioxidant, it did not interfere in the activity of herbal supplement. Although the FBS level did not reduce in the groups administered with CC and herbal mixture solely, their combination could decrease the FBS; this result might be ascribed to the synergistic effects of their combination. Further studies are needed to prove these findings.

Limitations of the Study
One of the major strengths of this study was not only the analysis of essential pharmacophores, TPC, TFC, DPPH, and FRAP in a herbal mixture, but also the evaluation of its efficacy on serum antioxidant levels and glycemic biomarkers in infertile PCOS women. Furthermore, in previous studies, the effects of all aforementioned herbs were investigated separately, while we evaluated the effects of CC and herbal mixture as a new combination, which might have synergistic effects. Nonetheless, the relatively small sample size, short-term follow-up, single-blind design, and using a fixed dose of herbal mixture in the clinical study were the limitations of this study.
We recommend that further research should be undertaken regarding the effects of herbal mixtures on hormonal factors of PCOS women such as sexual hormones in both proliferative and secretory phases, and lipid profile in a longer follow-up.

Conclusions
In summary, the results indicated that phenolics and phyto-antioxidant constituents of the herbal mixture including zingiberene, α-curcumene, β-sesquiphellandrene, α-farnesene, β-bisabolene, cinnamic aldehyde, and pulegone could effectively improve antioxidant potential, and the levels of FBS, HOMA-IR, and insulin in the serum of PCOS patients. It can be concluded that consumption of a herbal mixture as a supplement alongside CC can improve the antioxidant activity, glycemic status, and pregnancy rate in PCOS patients. Hence, it could be considered as a beneficial supplementary medicament for patients suffering from PCOS.