What the research shows
Cohen and colleagues analyzed 25 U.S. products sold as melatonin gummies. Only three contained melatonin within 10% of the labeled amount. Among gummies in which the researchers detected melatonin, the amounts ranged from 74% to 347% of the label claim. This was a sample of products on the market, with no measurement of sleep or patient outcomes. Read the U.S. gummy analysis.
Documented formats
The investigators analyzed finished gummies. A certificate for the raw melatonin ingredient would answer a different question from a test on a measured serving of the final product.
Testing and purity
Match the lot and serving size to the package. If a serving is two gummies, compare the measured two-gummy amount with the label claim for that serving.
How to read a batch reportQuestions about Melatonin
What does 347% of the labeled amount mean?
The measured amount was 3.47 times the amount declared on that product. It does not mean the product was 347% pure.
Can this study tell me which gummy worked best for sleep?
No one took the products in this experiment. The authors measured chemical content and compared it with the labels.