Melatonin dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
A 2013 meta-analysis found a small effect on primary sleep disorders. There is no blood test that sets the dose. Label accuracy is the product story. Not a longevity hormone you can panel into place.
- People given it
- 0
- Human studies
- 0
- Found nothing
- 0
Dose
No human dose established
No published study on this page has given this compound to people and reported a result.
no study of any kind on record
No first-hand reports gathered yet. That is a gap in what we have collected, not a finding that nothing has been reported.
What it has been measured to do
Nothing indexed yet
The 1 citation on this page do not report a result for any of the 36 goals indexed here. Registry entries, pharmacokinetics, safety reporting and regulatory records are not outcome evidence, and most of what sits here is one of those.
When this earns a spot
It matters as a sleep-timing conversation, not as a blood-marker supplement. A 2013 meta-analysis of melatonin for primary sleep disorders found a small effect. Label accuracy is the product story: doses on bottles often do not match the powder inside. It does not matter as a longevity hormone you can blood-test into place.
Bloodwork that belongs beside the bottle
No baseline blood marker. If you are on other sedating medicines, that is a clinician conversation.
No required blood marker on this compound. That is stated on purpose.
Default retest window: 90 days. If the named marker did not move, stop.
- There is no useful consumer melatonin blood test for dose-finding.
- Morning grogginess is a product and timing signal, not a lab.
Reading the number
If sleep did not change in a few weeks, stop. More milligrams is not a smarter experiment when the label may already be wrong.
What people typically order
Nothing on a blood panel. Read /supplements/quality. Buy less milligrams than the bottle brags about if you buy it at all.
Show full evidence
Overview
Melatonin is the pineal night signal sold as a sleep capsule. A 2013 meta-analysis of primary sleep disorders reported a statistically significant but small effect on sleep. That is the human file this stub will lead with.
What it will not do is pretend there is a blood test that tells you your milligram dose, or that more milligrams are a smarter experiment. Bottle labels in this aisle are a quality problem. If the powder does not match the label, you did not buy the meta-analysis.
It is not on the owner's floor. It is not a substitute for looking at alcohol, light, apnea, or a medicine that already sedates you. Those are clinician and habit conversations.
Mechanism of action
Melatonin receptors in the suprachiasmatic nucleus help time circadian sleep propensity. Exogenous melatonin is a timing cue and, at higher doses, a sedating signal. Timing cue and knockout dose are different uses. This stub will not print a jet-lag protocol as if it were longevity medicine.
Human evidence
Small sleep-effect evidence exists. A longevity or anti-cancer file is not on this stub, and a blood-marker file does not exist in the consumer sense.
- 2013 PLOS ONE meta-analysis: small effect on primary sleep disorders.
- No consumer melatonin blood test is treated here as a start/stop gate.
What this does not tell you: Primary sleep disorders are not shift-work, not apnea, and not peri-menopausal insomnia. Those need their own files. Label accuracy is the unwritten second half and lives on /supplements/quality until a later pass cites specific product surveys.
The evidence, charted
Fig. 1a · evidence scale
0people have taken this in any study cited here
0 participants · 0 human studies
What this page cites instead is 1 review. None of it involved giving the compound to a person.
Counted from the citation list on this page. A figure is drawn here only when a human study is cited; an empty one is the finding, not a gap in the page.
Fig. 1b · evidence mix
None of the 1 citation here is human work.
- Review · summarises other work1100%
Counted from the citation list on this page, typed as this page types it. It understates any literature larger than the sources we cite, and a review counts once however many studies it covers.
Fig. 2 · evidence over time
Every citation here was published in 2013.
Too few distinct publication years on this page to plot as a timeline. The newest citation on file is from 2013, more than five years ago; the published record may have gone quiet.
Fig. 3 · legal status at a glance
US
Not approved
UK
Not approved
AU
Not approved
CA
Not approved
Not approved in any of the four jurisdictions shown. A jurisdiction's classification is a regulatory fact, not a verdict on the science; see Legal status below for the full text and any notes.
Fig. 4 · dose response
No human dose response curve exists
We draw this figure where the data supports it. For this compound in humans it does not, so the panel stays empty rather than borrowing an animal curve and implying it transfers.
Fig. 5 · molecular identity
- Modality
- Supplement
- Molecular weight
- Not on file
- Half-life
- None on file
- Sequence length
- None on file
No amino acid sequence is on file for Melatonin, which is expected: a supplement is not built from residues.
Key studies & citations
- Review2013Meta-analysis: melatonin for the treatment of primary sleep disorders.
Meta-analysis of melatonin in primary sleep disorders. Reported a significant but small effect. Not a longevity endpoint and not a dose-finding blood test.
Frequently asked questions
Has Melatonin been tested in people?
A 2013 meta-analysis found a small effect on primary sleep disorders. There is no blood test that sets the dose. Label accuracy is the product story. Not a longevity hormone you can panel into place. no study of any kind on record. 0 people given it across 0 completed trials. 0 found nothing.
What is the Melatonin dosage?
No human dose established. No published study on this page has given this compound to people and reported a result. no study of any kind on record
Is Melatonin FDA-approved?
Sold as a dietary supplement in the United States. Not approved as a hypnotic drug. Prescription melatonin-receptor agonists are separate medicines.
What blood test tells me my melatonin dose?
None that this site will use. If sleep did not change, stop. More milligrams is not the next experiment when the label may already be wrong.
Is this on the floor list?
No. The floor is omega-3, vitamin D, magnesium, and creatine.