Walk into any U.S. pharmacy, and you'll find a multicolored range of melatonin supplements marketed as sleep aids for adults and children alike.
The body-made hormone melatonin streams through our systems every evening, preparing us for rest. But while melatonin supplements claim to mimic this natural process, experts say bottles stamped with claims like "100% drug free" may be misleading.
Get the world’s most fascinating discoveries delivered straight to your inbox.
