Supplement evidence

028 / 575Sleep/circadian

Melatonin

View my plan →

The short answer

Helping circadian timing and jet lag; some insomnia outcomes improve modestly.

Evidence and scope: Conditional or population-specific
This status does not grade the ingredient for every goal, outcome, or person.
Important limitation: It is not a proven longevity supplement, and benefits differ by sleep problem.
Before deciding: Can cause daytime sleepiness and interact with medicines; product content may not match labels.

01 / PRACTICAL GUIDE

Dose, absorption, and combinations

These are indication-specific reference or studied ranges—not a personalized prescription. Start with the objective, then check the form, label, medicines, and health conditions.

Reference range by objective

Sleep onsetStart low: 0.5–3 mg 30–90 minutes before bed

Reference or studied range—not a personalized prescription. The product label or a clinician may specify a different dose.

Dose source ↗

Jet lag0.5–5 mg near destination bedtime for a few days

Reference or studied range—not a personalized prescription. The product label or a clinician may specify a different dose.

Dose source ↗

More is not automatically better. A clinician or product label may specify a different amount.

Absorption / solubilityFat-soluble / lipid-based

Fat-soluble or lipid-based. Absorption generally improves with a meal containing fat.

How it is commonly taken

Use timing matched to the objective; more is not necessarily better.

Do not combine casually

Sedatives, alcohol, anticoagulants, seizure disorders, pregnancy, and driving require caution.

Dose and use source ↗

Dose and use links lead to primary or official source material. Search links are discovery tools, not proof that every returned paper applies.

02 / EVIDENCE

What the research says

We keep supportive, mixed, negative, safety, and contextual findings together. The headline never replaces the underlying papers.

5research papers in this ledger

19unique primary studies represented

1,683unique participants represented

These are audited counts for this JIVANA collection, not search-result totals. Participants are counted once when multiple papers use the same cohort; review papers are not added again to participant totals.

Open the research timelineResearch timeline

Entries are ordered by publication year. A study period appears only when the source reports it.

2022

Safety signalPMID 34923676

Safety of higher doses of melatonin in adults

Only four studies had low risk of bias. Serious events or withdrawals did not clearly rise, but general adverse events increased and reporting was incomplete. Overlap excludes it from totals.

Published: 2022

Study design and methods

Design: Systematic review and meta-analysis of 79 randomized trials
Population: 3,861 adults over 30 across varied medical conditions
Intervention: At least 10 mg melatonin versus control
Outcome: Adverse events, serious events, and withdrawals

Open research record ↗

2019

Safety signalPMID 31722088

Adverse Events Associated with Melatonin for the Treatment of Sleep Disorders

Reported adverse events were generally mild, but most trials were short and only eight were rated good quality, limiting long-term safety conclusions. Overlap excludes it from totals.

Published: 2019Duration: Mostly 4 weeks or less; monitoring up to 29 weeks

Study design and methods

Design: Systematic review of 37 randomized placebo-controlled trials
Population: People treated for primary or secondary sleep disorders
Intervention: 0.15–12 mg melatonin daily versus placebo
Outcome: Adverse events and study quality

Open research record ↗

2017

Safety signalPMID 27855744

Melatonin supplements: presence of serotonin and variability of content

Measured content ranged from 83% below to 478% above label claims; 8 of 31 products contained serotonin.

Published: 2017

Study design and methods

Design: Laboratory analysis of 31 commercial supplements
Population: Commercial melatonin products rather than human participants
Intervention: Chemical testing of labeled melatonin products
Outcome: Actual melatonin content and serotonin contamination

Open research record ↗

2013

Supports a specific usePMID 23691095

Melatonin for the treatment of primary sleep disorders

Sleep onset was about 7 minutes earlier and total sleep time about 8 minutes longer; sleep quality improved modestly.

Published: 2013n=1,683 participants19 primary studies represented

Study design and methods

Design: Meta-analysis of randomized placebo-controlled trials
Population: 1,683 adults and children with primary sleep disorders across 19 studies
Intervention: Melatonin versus placebo; dose and duration varied
Outcome: Sleep latency, total sleep time, and sleep quality

Funding or conflict note: The review reported partial support from two Eli Lilly research awards to one author.

Open research record ↗

2002

Supports a specific usePMID 12076414

Melatonin for the prevention and treatment of jet lag

Nine trials favored melatonin after crossing at least five time zones; timing mattered, and doses above 5 mg added no clear benefit. Participant totals were unavailable, so this is context-only.

Published: 2002

Study design and methods

Design: Cochrane systematic review of 10 randomized trials
Population: Air travelers, airline staff, or military personnel crossing time zones
Intervention: 0.5–5 mg oral melatonin near destination bedtime; some trials tested other doses or timing
Outcome: Jet lag, sleep, daytime tiredness, and adverse effects

Open research record ↗

Unscreened discovery appendix—not evidence2,184 candidate publicationsSearch run: Aug 21, 2026

Complete for the displayed PubMed query at the search timestamp—not for all databases or every possible synonym. Candidates can be irrelevant, duplicate the same study, or report negative findings. They are never summed as evidence or participants until screened.

03 / SOURCES

Start with the source material

Official evidence overviewNational Center for Complementary and Integrative Health Live PubMed discovery searchNational Library of Medicine

The live search is for discovery only. Search-result counts change and are not included in the audited totals above.

Recent PubMed discovery recordsDirect links to the first 12 records returned by the reproducible search. These are discovery candidates—not reviewed summaries or a count of supportive findings.

04 / EXPERT CONTEXT

Expert context—not evidence

Expert positions are dated context—not scientific evidence. They never raise the evidence status or become consensus by repetition.

No direct, source-verified endorsement is currently recorded. Research authorship or discussion alone is not treated as endorsement.