Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content
Open accessAbstract
Study objectives Melatonin is an important neurohormone, which mediates circadian rhythms and the sleep cycle. As such, it is a popular and readily available supplement for the treatment and prevention of sleep-related disorders including insomnia and jet lag. This study quantified melatonin in 30 commercial supplements, comprising different brands and forms and screened supplements for the presence of serotonin.Methods A total of 31 supplements were analyzed by ultraperformance liquid chromatography with electrochemical detection for quantification of melatonin and serotonin. Presence of serotonin was confirmed through analysis by ultraperformance liquid chromatography with mass spectrometry detection.Results Melatonin content was found to range from -83% to +478% of the labelled content. Additionally, lot-to-lot variable within a particular product varied by as much as 465%. This variability did not appear to be correlated with manufacturer or product type. Furthermore, serotonin (5-hydroxytryptamine), a related indoleamine and controlled substance used in the treatment of several neurological disorders, was identified in eight of the supplements at levels of 1 to 75 μg.Conclusions Melatonin content did not meet label within a 10% margin of the label claim in more than 71% of supplements and an additional 26% were found to contain serotonin. It is important that clinicians and patients have confidence in the quality of supplements used in the treatment of sleep disorders. To address this, manufacturers require increased controls to ensure melatonin supplements meet both their label claim, and also are free from contaminants, such as serotonin.Commentary A commentary on this article appears in this issue on page 163.
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The melatonin content of 31 over-the-counter melatonin products ranged from −83% to +478% of label claim.
“The melatonin content of the 31 over-the-counter melatonin products was found to be −83% to +478% of that listed on the label. [257]”
From Is Melatonin the “Next Vitamin D”?: A Review of Emerging Science, Clinical Uses, Safety, and Dietary Supplements (2022) · cites this paper as [257]
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- Authors
- Erland, L. A. E., & Saxena, P. K.
- Affiliations
- University of Guelph (CA)
- Corresponding author
- Saxena, Praveen K.
- Venue
- Journal of Clinical Sleep Medicine
- Published
- 2017-02-15
- Volume
- 13
- Issue
- 2
- Pages
- 275-281
- ISSN
- 1550-9389 (ISSN-L)
- 1550-9397
- PMC
- PMC5263083
- OpenAlex
- W2587113438
- Cited by
- 273
- References
- 27
- Citations by year
- 2026: 29 · 2025: 39 · 2024: 37 · 2023: 48 · 2022: 35 · 2021: 28 · 2020: 26 · 2019: 17 · 2018: 10 · 2017: 4
- FWCI
- 9.56
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Clinical Sleep Medicine (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Natural Sciences and Engineering Research Council of Canada (46741)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Pharmaceutical Quality and Counterfeiting
- Health Sciences › Medicine › Complementary and alternative medicine › Complementary and Alternative Medicine Studies
- Keywords
- serotonin, supplement quality, lot-to-lot variation, insomnia, sleep disorders, supplement regulation
- MeSH terms
- Biological Products, Chromatography, Liquid, Melatonin, Serotonin, Mass Spectrometry, Dietary Supplements, Electrochemical Techniques
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