The physiology and pharmacology of melatonin in humans.
Level 5 - mechanism / opinion, no new human data
Narrative review summarizing melatonin physiology and pharmacology without systematic review methodology.
PubMed 9550114 · doi:10.1159/000023160
What was done
This narrative review summarizes the physiological regulation, synthesis, measurement methods (plasma, saliva, and urinary 6-sulfatoxymelatonin), and pharmacological effects of melatonin in humans, focusing on its role as a marker and regulator of the endogenous circadian timing system.
What was found
The abstract reports no empirical numbers or quantitative data. It outlines that nocturnal pineal melatonin synthesis is regulated by the suprachiasmatic nucleus and light/dark cycles, that light suppresses and entrains its secretion, and that exogenous melatonin can modify endogenous circadian rhythms following a phase-response curve.
Why it matters
It outlines the physiological rationale for using exogenous melatonin and melatonin analogs to treat circadian rhythm disorders such as jet lag, shift-work disorder, delayed sleep phase syndrome, and insomnia in blind or elderly populations.
Limits
The abstract contains no primary data, quantitative results, sample sizes, or statistical analyses. As a narrative review, it does not detail literature search strategies, inclusion criteria, or critical risk-of-bias assessments for the discussed indications.
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