How Much Melatonin is Too Much for an Adult?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
There is no single melatonin dose that is too much for every adult. Higher doses may increase side effects and generally should not be used without guidance from a healthcare professional. In the United States, melatonin is regulated as a dietary supplement rather than approved as a medication. Higher doses may increase side effects such as daytime drowsiness and headache, while evidence about hormonal effects in adults is limited. Some adults use a low dose, such as 0.5-3 mg, before bedtime. The best dose and timing depend on the sleep problem, and higher doses do not necessarily provide greater benefit. Taking melatonin at the wrong time may shift your sleep-wake rhythm in an unwanted direction. Evidence that typical use permanently reduces the body’s own melatonin production is lacking.
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