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Article

An Approach to Investigate Content-Related Quality of Nutraceuticals Used by Slovenian Consumers: A Case Study with Folate and Vitamin D Supplements

by 1,2, 1 and 1,2,3,*
1
Nutrition Institute, Tržaška Cesta 40, SI-1000 Ljubljana, Slovenia
2
VIST–Higher School of Applied Sciences, Gerbičeva Cesta 51A, SI-1000 Ljubljana, Slovenia
3
Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
Academic Editor: Oliver Chen
Foods 2021, 10(4), 845; https://doi.org/10.3390/foods10040845
Received: 14 March 2021 / Revised: 9 April 2021 / Accepted: 10 April 2021 / Published: 13 April 2021
A predisposition for the efficiency of nutraceuticals is that the product contains a sufficient quantity of a vitamin. Several studies have highlighted different quality issues. Our objective was to investigate whether the contents of the vitamins in selected types of food supplements were in accordance with labeling. We focused on two types of food supplements where content-related quality issues could result in public health risks: food supplements for supplementation with (a) folic acid (as 5-methyltetrahydrofolate (5-MTHF)) in pregnancy and (b) with vitamin D in the general population. The study was done on supplements from the global supply that are typically used by Slovenian consumers. We sampled one production batch of 30 different food supplements—six and 24 samples with 5-MTHF and cholecalciferol, respectively. We found samples with vitamin contents outside the 80–150% tolerance interval in both sets. Particularly, 5-MTHF was found to be more problematic, probably due to its lower stability. This study shows the need for better quality control. Quality control is needed during both the manufacturing process and product shelf lifetimes. Content quality should be also subject to external controls by authorities. Voluntarily quality control schemes would also enable consumers to identify products of sufficient quality. View Full-Text
Keywords: food supplements; dietary supplements; public health; safety; quality; vitamin D; cholecalciferol; folate; folic acid food supplements; dietary supplements; public health; safety; quality; vitamin D; cholecalciferol; folate; folic acid
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MDPI and ACS Style

Žmitek, K.; Krušič, S.; Pravst, I. An Approach to Investigate Content-Related Quality of Nutraceuticals Used by Slovenian Consumers: A Case Study with Folate and Vitamin D Supplements. Foods 2021, 10, 845. https://doi.org/10.3390/foods10040845

AMA Style

Žmitek K, Krušič S, Pravst I. An Approach to Investigate Content-Related Quality of Nutraceuticals Used by Slovenian Consumers: A Case Study with Folate and Vitamin D Supplements. Foods. 2021; 10(4):845. https://doi.org/10.3390/foods10040845

Chicago/Turabian Style

Žmitek, Katja, Sanja Krušič, and Igor Pravst. 2021. "An Approach to Investigate Content-Related Quality of Nutraceuticals Used by Slovenian Consumers: A Case Study with Folate and Vitamin D Supplements" Foods 10, no. 4: 845. https://doi.org/10.3390/foods10040845

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