Melatonin

The primary sleep hormone, studied for circadian regulation and sleep onset.

In the literature, Melatonin appears most often in work focused on sleep and circadian rhythm. Studies in this area tend to look at mechanisms and observed effects in laboratory and preclinical settings rather than outcomes in people, so the picture is best read as a map of where researchers have been curious — not as evidence of any benefit.

Melatonin is catalogued here under tablets. Coverage of this compound varies in quality and depth, and much of it remains early-stage. Reading the underlying research directly is the only way to judge how strong any particular finding is.