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melatonin

melatonin Melatonin is a hormone and tryptophan-derived neurotransmitter that helps regulate sleep and wake cycles.

Melatonin is a hormone and tryptophan-derived neurotransmitter that helps regulate sleep and wake cycles. It is produced from serotonin in the pineal gland and retina and can affect the activity of other neurotransmitters such as dopamine and GABA.

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Sources

Drafting source: NCI Thesaurus. Flat export snapshot 2026-10-18. “Melatonin” (C2267).
CC-BY-4.0 · Definition uses new wording; original source retains its stated licence. · Source snapshot SHA-256: b27ca135beadd46c343d248135377c5077c5447fe11b93803bfab866b84fcd38

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PsychTerms (psychterms.org), CC BY 4.0, version 1. “melatonin.” Development preview.

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