What is the dose of Melatonin?

Dose response meta analysis suggested sleep effects peaking around 4 mg/day and timing about 3 hours before desired bedtime in that analysis; common practice varies. | Oral melatonin; immediate vs prolonged release and timing should be separated.

Compound Profile

Melatonin

Dose response meta analysis indicates melatonin effects depend heavily on timing and dose; adult chronic insomnia evidence is nuanced and not uniformly positive.

Use extra caution — Safety evidence: higher dose adult trials found more drowsiness, headache, and dizziness without a detected serious adverse event increase, but reporting and long term evidence were limited. Details

Last reviewed: July 9, 2026•6 sources citedReport a correctionProfile-wide ·A Strong

The Hippie Scientist

Verdict: MelatoninSituation-dependent

Best for

Jet lag
Delayed sleep phase / shifted clock
Resetting a disrupted schedule

Not ideal for

Staying asleep through the night
Everyday "can't switch off" insomnia
A relaxation aid

Evidence confidence: Strong for timing (jet lag, delayed sleep phase); weak for general insomnia
Expected onset: 30–60 minutes (timing-dependent)
Give it: A few nights for circadian use

Bottom line: A timing signal, not a sedative. Excellent for jet lag and shifted clocks at low doses; underwhelming for ordinary insomnia, where lower doses often beat higher ones.

Safety: Most people overshoot the dose; more is not better and can cause next-day grogginess. Use the lowest effective amount and involve a clinician for children or ongoing use.

On the evidence: Robust for circadian rhythm timing; effect on general insomnia is small.

Consider instead: Magnesium — for relaxation-type sleep trouble

How strong is the evidence?Moderate — split by use case

Why not higher

For ordinary insomnia the benefit is small (often minutes)
Over-the-counter doses are frequently far higher than needed
Long-term and pediatric data are limited

Why not lower

Strong, consistent evidence for circadian uses (jet lag, delayed sleep phase)
The mechanism (circadian signaling) is well understood
Short-term use is well tolerated in healthy adults

Practical takeaway: Best matched to a timing problem, at the lowest effective dose. If the issue is "can't switch off," a relaxation-first option often fits better. Involve a clinician for children or ongoing use.

Next stepsWhere to go next — guides & comparisons

Start here

New to this? Begin with Best supplements for sleep.

Compare first

Magnesium vs. melatonin — if unsure which fits your sleep problem
Melatonin vs. valerian vs. magnesium — if comparing the main sleep options
Sleep herbs vs. melatonin — if deciding between herbs and a hormone

If you want help sleeping → Sleep guides
If you want to browse more compounds → All compounds

Quick stats

Evidence level: Strong evidence
Typical onset: Varies by prep
Safety rating: Use extra caution: Use caution
Best for: Melatonin Receptors MT1/MT2, Suprachiasmatic Nucleus, MT1 MT2

Safety

Safety & Cautions

High caution

Caution level: High. Multiple caution categories apply, or the record uses avoid/contraindication language.

Interaction-AwareMedication or interaction context is explicitly noted.
Hormonal Activity ContextHormone-adjacent wording is present and should be interpreted carefully.
Stimulant-Like ProfileStimulant-like or activating caution language is present.
Anticoagulant CautionBleeding or anticoagulant-adjacent caution language is present.

Safety evidence: higher-dose adult trials found more drowsiness, headache, and dizziness without a detected serious-adverse-event increase, but reporting and long-term evidence were limited
Who should avoid this?: No specific evidence-backed contraindication is documented for this profile. This is not the same as established safety.
Talk to a professional if: you are pregnant or breastfeeding.

Driving, concurrent sedatives, pregnancy, breastfeeding, pediatric use, and chronic use require individualized review.

Evidence-based safety

Caution when combined

Severity and certainty are shown separately. A high-priority caution can still be theoretical: these pairings are screened from shared contraindication mechanisms and are not automatically documented clinical interactions. Provenance identifies the source fields that produced each flag; it does not upgrade the certainty of the pairwise claim.

High-Priority Caution

147 flagged pairings

Bleeding / anticoagulant risk

Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.

Bleeding / anticoagulant riskCertainty: Theoretical

Data provenance recorded for 147 of 147 pairings in this mechanism group.

+135 more pairings share this mechanism. Use the Safety Checker to review a specific combination.

Moderate Caution

68 flagged pairings

Sedation / CNS depression

Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.

Sedation / CNS depressionCertainty: Theoretical

Data provenance recorded for 68 of 68 pairings in this mechanism group.

+56 more pairings share this mechanism. Use the Safety Checker to review a specific combination.

Evidence Summary

Profile-wide ·A Strong

Evidence lens

Most useful for practical interpretation when safety context also fits.

StrongStrong evidence

Human clinical evidence: Present in source signals

Mechanistic / preclinical: Mechanism mapped — Immune Signaling Modulation · Hormonal Signaling Context · Circadian Rhythm Modulation

Research maturity: Established research — main contexts: Melatonin Receptors MT1/MT2 · Suprachiasmatic Nucleus · MT1 MT2

Safety boundary: Safety note available — Safety evidence: higher dose adult trials found more drowsiness, headache, and dizziness without a detected serious adverse event increase, but reporting and long term evidence were limited.

This profile cites 6 human studies.

Evidence Strength

Confidence estimate based on the design quality and consistency of published clinical trials.

Strong evidence

Melatonin has a strong evidence rating.

Sleep SupportSleep

Citation density

3.3

Sources

Effects

Research recency

Mixed recency

Evidence Grade

Grade A: Strong Evidence

Evaluation of methodological rigor, population reach, and evidence alignment.

Design Match: Meta analysis
Risk of Bias: Low
Consistency: Consistent

Strongest recorded design is a meta analysis, drawn from 16 recorded studies, 14 in people. No disagreement is recorded across them.

How evidence grades work

Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.

Strong: Multiple RCTs, consistent direction, adequate effect size
Moderate: Some RCTs or consistent observational data in humans
Preliminary / Mixed: Animal or in-vitro only, or conflicting human data
Traditional / Theoretical: Traditional use only; no controlled human trials

Clinical Study Summaries (10)6 human evidence sources · 0 human trials · ~5,544 participants across 2 human evidence sources with reported N · Consistency not yet classifiable

Filter by study class

Showing 10 of 10 studies.

What the evidence actually shows

This table contains 10 structured sources, including 6 human evidence sources; 0 are human trials. Across 2 human evidence sources with a reported sample size, the approximate participant total is 5,544; overlapping publications may include some of the same people. Source-to-conclusion relationships are not classified in this structured set, so consistency is not yet classifiable.

Profile-wide evidence grade: see the profile grade above · Confidence: not separately assigned

What would change our conclusion?

Larger, well-controlled human trials using comparable populations, doses, preparations, and clinically meaningful outcomes could materially strengthen or weaken this conclusion. Replication in a different population or a high-quality synthesis resolving current disagreement could also materially change confidence.

Study	Design	N	Dose	Duration	Population	Outcome	Result & magnitude	Source
Meta-analysis: melatonin for the treatment of primary sleep disorders PubMed · PLoS One · 2013 Background	Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies.	n=1683	—	—	—	—	—	PubMed →
Optimizing the Time and Dose of Melatonin as a Sleep-Promoting Drug: A Systematic Review of Randomized Controlled Trials and Dose-Response Meta-Analysis F. Cruz-Sanabria; S. Bruno; A. Crippa; P. Frumento; M. Scarselli; Debra J. Skene; U. Faraguna · Journal of Pineal Research · 2024 Background	Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies.	—	—	—	—	—	—	PubMed →
Safety of higher doses of melatonin in adults: A systematic review and meta-analysis Zoe M Schrire; C. Phillips; J. Chapman; S. Duffy; G. Wong; A. D’Rozario; M. Comas; I. Raisin; B. Saini; C. Gordon; A. McKinnon; S. Naismith; N. Marshall; R. Grunstein; C. Hoyos · Journal of Pineal Research · 2021 Background	Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies.	n=3861	—	—	—	—	—	PubMed →
The effect of melatonin on sleep quality and daytime sleepiness in Parkinson's disease: A systematic review and meta-analysis of randomized placebo-controlled trials Background	Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies.	—	—	—	—	—	Melatonin modestly reduced excessive daytime sleepiness (ESS MD -0.97, 95% CI -1.81 to -0.14).	PubMed →
Efficacy of melatonin and ramelteon for the acute and long-term management of insomnia disorder in adults: A systematic review and meta-analysis Background	Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies.	—	—	—	—	—	Prolonged-release melatonin produced modest improvements in subjective and objective sleep-onset latency and objective sleep efficiency.	PubMed →
Efficacy of melatonin for chronic insomnia: Systematic reviews and meta-analyses Background	Systematic review Uses a predefined method to find and evaluate relevant studies, but may or may not pool their results statistically.	—	—	—	—	—	In adults with non-comorbid chronic insomnia, melatonin did not clearly improve sleep latency, total sleep time, or sleep efficiency.	PubMed →

Show 4 more studies

Wound ballistics of firearm-related injuries--part 2: mechanisms of skeletal injury and characteristics of maxillofacial ballistic trauma PubMed · Int J Oral Maxillofac Surg · 2015 Background	Narrative review Summarizes selected literature without the full prespecified search and selection methods of a systematic review.	—	—	—	—	—	—	PubMed →
Exogenous Melatonin and Sleep Quality: A Scoping Review of Systematic Reviews Background	Narrative review Summarizes selected literature without the full prespecified search and selection methods of a systematic review.	—	—	—	—	—	Most meta-analyses versus inactive comparators favored melatonin, but only a small fraction of reviews met all predefined rigor criteria. \| Among 215 meta-analyses comparing melatonin with an inactive comparator, 80.9% favored melatonin, 7.9% favored the comparator, and 11.2% were unclear.	PubMed →
Biopsychosocial determinants of physical and mental fatigue in patients with spondyloarthropathy PubMed · Rheumatol Int · 2011 Background	Other / unclear The study design is not yet classified clearly enough to infer its place in the evidence hierarchy.	—	—	—	—	—	—	PubMed →
A putative novel nuclear-encoded subunit of the cytochrome c oxidase complex in trypanosomatids PubMed · Mol Biochem Parasitol · 2002 Background	Other / unclear The study design is not yet classified clearly enough to infer its place in the evidence hierarchy.	—	—	—	—	—	—	PubMed →

How Melatonin Works

Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.

Mechanism Pathway — How Melatonin Works

CompoundTarget / ReceptorMechanismEffect / Outcome

Dosing

Dose guidance: Dose response meta analysis suggested sleep effects peaking around 4 mg/day and timing about 3 hours before desired bedtime in that analysis; common practice varies. | Oral melatonin; immediate vs prolonged release and timing should be separated.

Mechanisms & biological pathways

Preclinical mechanism details from scientific profiles; these represent plausible pathways but do not guarantee clinical efficacy in humans.

Immune Signaling Modulation
Hormonal Signaling Context
Circadian Rhythm Modulation
Melatonin Receptor Agonism

Guides that use Melatonin

Goal guides

sleep

Condition guides

Continue exploring

Related research paths

Related Compounds

Compounds connected by the same goals, effects, or research topics.

Related Herbs

Botanicals connected by the same goals, effects, or research topics.

Related Guides

Deeper context, comparisons, and practical research paths.

Related Safety Pages

Safety checks and cautions relevant to this decision.

Deeper context, comparisons, and practical research paths.

Best Supplements For SleepShared topic: Sleep

Compare & Sourcing

Compare side-by-side tradeoffs or verify active marker guidelines.

Related alternatives

Ashwagandha Ashwagandha KSM 66 Extract Astragalus Astragalus Membranaceus

Herbs for similar conditions

Valerian Ashwagandha Withania somnifera Tribulus Tribulus terrestris Valeriana officinalis

Tradeoffs

Free safety checklist

Get the Melatonin evidence notes

Occasional research updates, safety context, and product-quality checks for supplement decisions.

We use your email to send the checklist and occasional evidence-first supplement updates. Unsubscribe anytime. Privacy policy.

Sourcing options

Melatonin product picks

Recommendation status

Product recommendations are not shown for this profile because the current site safety and monetization policy does not permit them.

Product form & quality guidelines

When sourcing Melatonin, verify the label for:

Standardized Extract: Confirm active content percentages on the supplement facts panel (e.g. standardized to specific marker compounds) rather than simple raw herb weights.
Third-Party Testing: Look for independent purity labels (USP, NSF, ConsumerLab, or Eurofins) to ensure the product is free from heavy metals, solvents, and contaminants.
Form Bioavailability: Ensure the form matches evidence-supported configurations (e.g. chelated bisglycinate/glycinate for magnesium, micronized monohydrate for creatine) for optimal onset and digestion tolerance.

Safety first · Harm reduction

This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.

Learn how we evaluate confidence, safety, and intensity on the methodology page.

Editorial Review

Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.

Editorial Standards →

Help improve this profile

Was this useful for your research?

These controls record only the page and the structured choice you make when analytics consent is enabled. Please don’t include personal medical information in research requests.

Was this evidence summary clear?

Did you find what you were researching?

Suggest an ingredient, comparison, or study →

← Back to compounds library Safety checker →

Compound profile context

How to interpret Melatonin

Melatonin compound profile with evidence context, key research topics, source notes, safety context, and references presented in an evidence-first format. Use this compound profile to understand mechanism, evidence quality, and practical safety context before comparing products or building a stack. A biochemical pathway connection can be useful for discovery, but it is not the same as proven benefit in humans.

When reviewing Melatonin, separate the active molecule from the product category around it. Dose form, absorption, extract standardization, medication interactions, and individual sensitivity can change the real-world risk-benefit picture.

For supplement planning, avoid combining multiple compounds with overlapping sedating, stimulating, serotonergic, blood-pressure, anticoagulant, or liver-metabolism effects unless a qualified clinician has reviewed the context.