Some melatonin pills contain unlisted serotonin, and this isn't just because of added herbs. It's likely caused by factory mix-ups, chemical breakdowns, or poor quality control during manufacturing and packaging.

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Evidence from Studies

Supporting (1)

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Community contributions welcome

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Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content

Cross-Sectional Study

2017 Feb 15

A study testing popular melatonin pills found that some contained unwanted serotonin, proving that poor manufacturing quality control, not just herbal ingredients, is causing this contamination. This shows consumers need better safety standards to ensure their sleep supplements are pure.

Contradicting (0)

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No contradicting evidence found

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Source Study

Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content

Score: 29

DOI: 10.5664/jcsm.6462

Similar Assertions

Serotonin, a potent neurotransmitter and strictly controlled substance, is present as an unlabelled contaminant in approximately 26% of commercial melatonin supplements, with detected concentrations ranging from 1 to 75 micrograms per dose. The presence of this biologically active compound in sleep aids raises significant safety concerns, particularly regarding potential adverse interactions with other medications or the risk of serotonin syndrome in sensitive individuals.

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