Many people rely on melatonin gummies to help them get a good night's sleep. But a recent study finds that these over-the-counter supplements may not reliably contain the advertised amount of melatonin.

According to the National Institutes of Health, about 19% of adults in the U.S. don't get enough sleep, and some of those sleep-deprived people use melatonin supplements to help them catch some z's.

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