Send any friend a storyA team of researchers analyzed 25 melatonin gummy products from different brands and found that 22 contained different amounts of melatonin than what was listed on their labels; one contained only 74 percent of the advertised amount of melatonin, while another had 347 percent of the labeled amount. An accurately labeled three-milligram gummy contains roughly a thousand times as much melatonin as the amount our brains naturally produce, said Philip Gehrman, an associate psychiatry professor at the Perelman School of Medicine of the University of Pennsylvania. Even with a supplement as seemingly innocuous as melatonin, you should talk with a physician before trying it, experts say