It is agreed upon that it should be taken before bedtime. Melatonin is a new discovery. It has yet to go through the extensive studies which most hormones and other dietary supplements go through. It seems to have many positive effects on the body. Distributors of the drug are making all kinds of unproved claims.
Caution is recommended when taking melatonin.
These tablets are not pure. People should not take melatonin for the time being except under controlled research conditions. Melatonin is a substance that could be very useful in many treatments once the right research has been done. Many manufacturers are making a lot of money off of people who do not know what they are taking. Melatonin is at a very experimental stage right now.