Melatonin is produced by the pineal gland. It is believed to play a role in anti aging, as well as helping with jet lag and insomnia. But caution is well advised with using melatonin as a supplement, given how powerful its effects are.

One of the problems with melatonin is that most of the studies were done on animals, like rats and not humans. Animal studies are used by the scientific community to indicate whether a substance has promise, and can yield valuable results even though they are ethically reprehensible and other alternatives exist. One such study was done at the University of Texas Health Science Center.
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