Experts have sounded the alarm about sleep supplement melatonin as use skyrockets in the US and led to a spike of overdoses in children.Melatonin, an over-the-counter sleep supplement, has surged in popularity over the past few years. Estimates suggest adult use has increased four-fold, and more than . The vitamin pills - available for $10 per bottle of 30 pills - are said to mimic the effect of natural melatonin, a hormone produced by the body in response to darkness.
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