Melatonin dosage guide: how much to take in 2026

Melatonin works only at the right dose in the right form. This guide covers the effective range, timing, best forms, and interactions to know.

US RDA

N/A

Effective dose

0.3 to 1 mg for most people (much lower than typical OTC 5 to 10 mg)

Upper limit

No established upper limit but higher doses cause paradoxical effects

Timing

30 to 60 minutes before desired sleep time

With food

Empty stomach

Bioavailability

Sublingual > tablets. Timed-release forms exist for sleep maintenance.

Best forms to buy

0.3 to 1 mg sublingual

Effective dose for most

3 to 5 mg

Standard OTC, often too much

Timed-release

For sleep maintenance issues

Signs of deficiency

· Not applicable

Drug interactions

· Sedatives
· Blood thinners
· Immunosuppressants
· Reduce blood pressure medications

Toxicity

Grogginess next day (usually from too-high dose). Not for daily long-term use in most cases.

FAQ

Common questions

How much Melatonin should I take?

0.3 to 1 mg for most people (much lower than typical OTC 5 to 10 mg)

When should I take Melatonin?

30 to 60 minutes before desired sleep time

Can I take too much Melatonin?

Grogginess next day (usually from too-high dose). Not for daily long-term use in most cases.

This article is for informational purposes only and does not constitute medical advice. Consult a licensed healthcare provider before starting new treatments, supplements, or procedures. Links to products may be affiliate links. Smart Milky may earn a commission at no additional cost to you.