Melatonin is the most-purchased sleep supplement in America and one of the most misused. Almost all commercial melatonin is synthesised — the rare ‘natural’ (animal-derived) versions are not recommended for safety reasons. The bigger problem is dose: most products supply 3–10 mg when the trials showing benefit used 0.3–1 mg.
Natural vs synthetic — the real story
Natural (animal-derived) melatonin comes from bovine pineal glands and carries theoretical contamination risk — viral particles, prions. The FDA and most medical bodies recommend against animal-sourced melatonin. Synthetic melatonin is chemically identical to the molecule your pineal produces and is the safer choice. Marketing claims that ‘natural’ is superior have no scientific basis here.
Plant-derived (phyto-melatonin) is a third category, extracted from tart cherries, pistachios, and other sources. Doses from food are tiny (microgram range) but real — see the foods chapter in our natural sleep protocol.
Why most people overdose
A 2017 analysis found commercial melatonin products ranged from 83 percent below to 478 percent above their label dose. Even at the labelled 3–10 mg, these doses are 5–30× the amount your pineal produces. High doses do not improve sleep; they often produce next-day grogginess, vivid dreams, and downregulation of your own production over time.
Trials showing benefit for jet lag and delayed sleep phase used 0.3–1 mg taken at strategic times. Start at 0.5 mg.
When melatonin actually helps
Strongest evidence: jet lag (especially eastward travel), shift work sleep disorder, delayed sleep phase syndrome in adolescents, and as a chrono-biotic in older adults whose endogenous production has declined. Weakest evidence: classic primary insomnia in healthy adults — where valerian, chamomile, or behavioural fixes outperform.
Timing matters more than dose. For jet lag eastward, take it at target bedtime in the new timezone. For delayed sleep phase, take it 5–7 hours before current sleep onset, then walk the timing earlier over 2 weeks.
Melatonin dose guide by use case
| Use case | Dose | Timing |
|---|---|---|
| Jet lag (east) | 0.5–1 mg | Target bedtime in new zone, 3–5 nights |
| Shift work | 0.5–3 mg | Pre-sleep regardless of time of day |
| Delayed sleep phase | 0.3–0.5 mg | 5–7 hr before current onset |
| Primary insomnia | 0.3–1 mg | 30–60 min before bed (modest evidence) |
| Pediatric ASD/ADHD sleep | Specialist guidance only | — |
Related reading: evidence-based herbal sleep remedies, foods that disrupt sleep.
Frequently Asked Questions
Can I become dependent on melatonin?
Physical dependence is unlikely; psychological reliance is possible. Endogenous melatonin production is not permanently suppressed by short-term use, but data on years of high-dose use is limited.
Is it safe for children?
Use only with paediatric specialist guidance. Dose-error harms are documented; emergency room visits for accidental pediatric overdose have risen sharply.
Should I use extended-release?
If middle-of-the-night wakings are your issue and endogenous melatonin is low (older adults), extended-release versions can help. For sleep onset, immediate-release at lower doses is better.
