# Melatonin: The Right Dose Is Much Lower Than Most Supplements Provide Canonical: https://www.migaku.app/guides/melatonin-dosage-sleep-guide Category: dosage-guide Summary: Most melatonin supplements contain 5–10 mg, but research shows 0.5–1 mg is often equally effective with fewer next-day effects. This guide explains the evidence and how to use melatonin correctly. Last reviewed: 2026-05-09 Reviewed by: Migaku Editorial Team ## Quick Answer The effective dose of melatonin for sleep onset is 0.5–1 mg, not the 5–10 mg found in most over-the-counter products. Higher doses cause supraphysiological blood levels, can blunt the body's natural melatonin signal over time, and increase next-day grogginess. Melatonin works best for circadian timing issues (jet lag, shift work) rather than treating insomnia disorders. --- ## Why Dose Matters Disproportionately Here Melatonin is a hormone produced by the pineal gland that signals darkness to the body. Normal peak endogenous levels are approximately 70–150 pg/mL. A 10 mg supplement produces blood levels 10–30× above the physiological peak. The body has melatonin receptors (MT1, MT2) that operate like a dimmer switch, not an on/off button. Receptor saturation occurs at much lower doses than most supplements provide. --- ## Evidence for Low-Dose Melatonin A frequently cited 2001 study (Lewy et al., *Chronobiology International*) found 0.5 mg was as effective as 3 mg for phase-shifting circadian rhythms. A 2014 Cochrane-associated review concluded doses below 1 mg were effective for jet lag with a better side-effect profile than higher doses. The clinical dosing guidelines in most European countries cap melatonin at 2 mg for sleep disorders, reflecting this evidence. --- ## What Melatonin Is Good For | Use | Evidence Level | |---|---| | Jet lag | Consistent — reduces adaptation time | | Shift work circadian adjustment | Moderate | | Delayed sleep phase disorder | Moderate | | Sleep onset insomnia | Preliminary — modest effect | | Chronic insomnia disorder | Insufficient — not recommended as first-line treatment | Melatonin does not treat insomnia disorder (difficulty staying asleep, non-restorative sleep). For chronic insomnia, Cognitive Behavioural Therapy for Insomnia (CBT-I) has far stronger evidence. --- ## Timing Is Critical Melatonin's effect depends heavily on when you take it relative to your natural circadian phase: - **For sleep onset:** 30–60 minutes before target sleep time. - **For jet lag (eastward travel):** Take at destination bedtime, starting the day of travel. - **For jet lag (westward travel):** Lower impact; melatonin is less effective for westward adjustment. - **For phase advance (early sleep):** Take in the evening, 5–6 hours before natural sleep time. Taking melatonin at the wrong phase can worsen circadian misalignment. --- ## Dosage Reference | Use | Dose | Timing | |---|---|---| | Jet lag / shift work | 0.5–1 mg | At destination bedtime | | Sleep onset | 0.5–1 mg | 30–60 min before bed | | Children (short-term, under medical advice) | 0.5–1 mg | 30 min before bed | | Maximum studied dose | 5 mg | Limited added benefit over 1 mg | --- ## Safety Notes - Melatonin is generally regarded as safe for short-term use. - **Long-term use effects on endogenous melatonin production** are not fully characterised — most guidelines recommend using it intermittently rather than nightly indefinitely. - **Children:** Short-term use under medical advice appears safe. Long-term effects on pubertal timing are theoretically possible but unstudied adequately. - **Pregnancy:** Limited safety data; avoid unless under medical supervision. - **Drug interactions:** Additive effects with sedatives. May affect warfarin — check interactions. --- ## Practical Next Steps 1. Start with 0.5 mg — most pharmacies carry this dose or it can be achieved by cutting a 1 mg tablet. 2. Take 30–60 minutes before your target bedtime. 3. Use for jet lag or circadian adjustment, not nightly as a sleep aid. 4. For persistent insomnia, pursue CBT-I before relying on melatonin.