| A recent analysis of national survey data shows that the use of melatonin dietary supplements more than tripled between 2009–2010 and 2017–2018. The analysis also showed that an increasing number of people are taking high doses (more than 5 mg/day) of melatonin. Melatonin is a hormone produced by the brain in response to darkness. It plays a role in the body's 24-hour internal clock and may also have other effects. People often use melatonin for insomnia, but there isn't strong evidence that it works for this purpose. Another type of treatment for insomnia—cognitive behavioral therapy—has better evidence of effectiveness. Although short-term use of low doses of melatonin appears to be safe, information on long-term safety is lacking. There's also little information about possible side effects when melatonin is taken at doses higher than what the body normally produces. An additional concern is that the amounts of melatonin in dietary supplements may not match what's listed on the label. Therefore, it's difficult for people to know how much melatonin they're actually taking. | 
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