How strong is the evidence for Melatonin?
Melatonin is among the most heavily meta-analyzed sleep supplements, and the picture that emerges is a real but modest effect that varies by population. That evidence is currently rated moderate (62/100), built on 8 published studies, including 8 meta-analyses -- a reasonable base, but not yet enough for full certainty.
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Melatonin
Moderate evidence
Evidence
62
Impact
30