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Mel
Sleep
Melatonin
Circadian hormone used short-term for sleep timing and jet lag; long-term safety uncertain.
What it is
Melatonin can help some sleep-onset and circadian timing problems; authoritative sources emphasize limited long-term safety data.
How it works
Acts on melatonin receptors to shift/entrain circadian rhythm and influence sleep propensity.
What the evidence says
Moderate evidence for circadian-related sleep issues; long-term nightly use is less well studied.
Safety Notes
- Short-term use appears safe for many adults; long-term safety and product variability remain concerns.
- Not recommended during pregnancy or while breastfeeding.
- Use caution with: pregnancy/breastfeeding (caution), autoimmune disease (caution).