Melatonin is an indole heterocyclic compound—chemically known as N-acetyl-5-methoxytryptamine—that primarily functions to regulate the sleep-wake cycle. It boosts the levels of two key neurotransmitters in the brain—gamma-aminobutyric acid (GABA) and serotonin—and is commonly used to alleviate jet lag and sleep disturbances caused by irregular sleep schedules.

Regulating Circadian Rhythms and Promoting Sleep: Melatonin helps shorten the time it takes to fall asleep and adjusts rhythm disruptions caused by jet lag or shift work.
Antioxidant and Anti-aging Effects: Melatonin is a potent free-radical scavenger—with antioxidant capabilities surpassing even those of vitamins C and E—that helps protect cells from oxidative damage and may delay aging by influencing telomerase activity.
Regulating Cardiovascular Rhythms: It helps lower nighttime blood pressure, provides cardiovascular protection, and may maintain a stable heart rate by regulating the autonomic nervous system.
Immune Regulation and Anti-inflammatory Effects: Melatonin possesses immunomodulatory functions, helping to alleviate chronic inflammatory responses in the body and playing a positive role in maintaining immune system homeostasis.