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Available forms

Melatonin is also available as an over-the-counter dietary supplement in many countries. It is available in both immediate-release and less commonly prolonged-release forms. The compound is available in supplements at doses ranging from 0.3 mg to 10 mg or more. It is also possible to buy raw melatonin powder by weight. Immediate-release formulations of melatonin cause blood levels of melatonin to reach their peak in about an hour. The hormone may be administered orally, as capsules, gummies, tablets, oral films, or as a liquid. It is also available for use sublingually, or as transdermal patches. Several inhalation-based melatonin products with a wide range of doses are available but their safety remains to be evaluated.