Melatonin Supplements: Serotonin Contamination and Quality Control Issues
Are Commercial Melatonin Supplements Actually Pure and Accurately Dosed?
Analysis of commercial melatonin supplements reveals significant quality control problems, with many products containing serotonin contamination and dramatic variations in actual melatonin content compared to labeled amounts. This comprehensive study tested 31 melatonin supplements and found that actual melatonin content ranged from 83% below to 478% above labeled amounts, with the majority of products (71%) containing melatonin levels that differed by more than 10% from the label. Additionally, 26% of products contained serotonin, a potentially dangerous contaminant that could cause serious adverse effects. The findings highlight major quality control issues in the melatonin supplement industry and raise important safety concerns for consumers.