Melatonin is a hormone that is naturally occurring in the body that plays a role in sleep. The production and release of melatonin in the brain is connected to the time of day, increasing when it's dark and decreasing when it's light. Research suggests that melatonin supplements may reduce the time it takes to fall asleep, can improve jet lag symptoms, such as alertness and daytime sleepiness, and help regulate night and day cycles or sleep-wake cycles.* Made with the cleanest possible ingredients and free of gluten or other major allergens (eggs, tree nuts, peanuts). This product also contains no soy, wheat, dairy, yeast, shellfish, or fish.