Research
Hormonal
Melatonin regulates circadian rhythms and sleep-wake cycles by acting on the suprachiasmatic nucleus (SCN) and pineal gland, with secretion peaking at night.
Melatonin is your body's natural signal for darkness and sleep. It is produced by the pineal gland in response to darkness, peaks at night, and helps regulate your sleep-wake cycle. Exposure to light at night suppresses this natural production.
StrongSupportsVERY_HIGH confidence
One of the earliest known functions of melatonin is its impact on circadian rhythms’ regulation. Light is the environmental factor known to affect melatonin secretion. Melatonin acts directly on the SCN and modulates clock function.
Why this rating
This is a foundational, widely accepted physiological fact cited extensively in the review.
Source
Melatonin in Medicinal and Food Plants: Occurrence, Bioavailability, and Health Potential for Humans
Bahare Salehi et al. · Cells · 2019
DOI 10.3390/cells8070681
narrative_reviewCited 172×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Melatonin acts as a potent antioxidant by scavenging reactive oxygen and nitrogen species, protecting against oxidative stress, and enhancing mitochondrial efficiency, independent of receptor binding.Good
- Dietary intake of melatonin-rich plant foods (particularly seeds and fruits) increases serum melatonin levels and urinary 6-sulfatoxymelatonin concentrations in humans, contributing to endogenous modulation.Moderate
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