Re: Melatonin
Information about reported side effects do not have to be listed on the product's packaging. Yet worsened fatigue and depression, constriction of the arteries to the heart (which could increase the risk of heart attack), and possible effects on fertility have been reported.
from:
http://www.sleepfoundation.org/publi...thefact.html#2
But then again... if people don't have sleeping disorders, they're out of business.