There is no FDA-established maximum melatonin dose for adults, but research indicates that 0.5 mg to 5 mg is the optimal safe and effective range.
Melatonin is a natural hormone that helps regulate your sleepwake cycle (circadian rhythm). It is also widely available in the United States as an over-the-counter (OTC) dietary supplement used to support sleep, especially for issues like jet lag, disrupted sleep timing or insomnia.
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Dosage and strength. Melatonin usually comes as 2mg, slow release tablets. These release melatonin gradually into your body during the night. For short-term sleep problems (insomnia) in adults. The usual dose is one 2mg slow release tablet taken 1 to 2 hours before bedtime.
