Some melatonin pills you can buy in the U.S. have strange, unknown chemicals in them—up to 1% of the pill—which isn't supposed to be there, even though they pass safety checks for the stuff they're supposed to contain.

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Against

Evidence from Studies

Supporting (1)

3

Community contributions welcome

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1336 The Critical Importance of Quality and Purity Management in Melatonin Supplement Manufacturing

Cross-Sectional Study

In Vitro

Scientists tested 10 melatonin supplements bought in the U.S. and found that some had strange, unknown chemicals making up nearly 1% of the pill—even though they passed safety checks for known chemicals. This matches the claim exactly.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

1336 The Critical Importance of Quality and Purity Management in Melatonin Supplement Manufacturing

Score: 3

DOI: 10.1093/sleep/zsaf090.1336

Similar Assertions

A small test of 10 melatonin pills bought in the U.S. found that 4 of them had way more or way less melatonin than what was printed on the bottle — so you might not be getting what you think you're paying for.

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83%

In the U.S., you can buy melatonin pills without a prescription, but they’re not checked like real medicines—so some pills might have way more or less melatonin than the label says, or even contain weird stuff you didn’t sign up for.

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80%