Melatonin

The body's natural melatonin production (which declines with age) is responsible for setting the internal "clock" that governs the timing of neuroendocrine functions and other physiological processes. Melatonin has been shown to regulate circadian rhythms and clinically has been used to facilitate adjustment to changing time zones, stabilize mood during seasonal variations in sunlight availability, and to support sleep.*

Not appropriate for pregnant or lactating women.