is melatonin safe
Last updated September 6, 2026.
For most healthy adults, melatonin at a low dose for a short period is considered safe, but it is not a long-term fix for ongoing sleep problems. Melatonin is a hormone your body makes in the evening, and the supplement version mainly shifts the timing of your sleep signal rather than sedating you. The usual approach is 0.5 to 5 mg taken 30 to 60 minutes before your target bedtime, and higher doses do not work better. In the United States melatonin is sold as a dietary supplement, so it is not reviewed by the FDA for strength or purity before sale and the amount in a product can differ from what the label says. Side effects are usually mild and include headache, dizziness, nausea, and grogginess the next morning. If you have trouble sleeping most nights for three months or more, structured behavioral treatment for insomnia works better and lasts longer than any supplement.
What to do
- Start low: Begin at 0.5 to 1 mg about an hour before bed and only increase if a low dose does nothing, since more is not stronger.
- Use it for timing: Melatonin helps most with jet lag or a sleep schedule that has drifted late, not with waking up at 3 a.m. or stress-related insomnia.
- Check for a USP or NSF seal: Third-party verification on the label is your best signal that the bottle contains what it claims.
- Review your medicine list: Ask a pharmacist or clinician before combining melatonin with blood thinners, seizure medicines, sedatives, or diabetes and blood pressure drugs.
- Keep it away from kids: Gummies look like candy, so store them capped and out of reach, and ask a pediatrician before giving melatonin to a child.
- Fix the basics first: A consistent wake time, morning light, and no screens or alcohol close to bed often do more than any supplement.
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