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Taken from https://www.webmd.com/vitamins/ai/ingredientmono-940/melatonin
Melatonin is a hormone found naturally in the body. Melatonin used as medicine is usually made synthetically in a laboratory. It is most commonly available in pill form, but Melatonin is also available in forms that can be placed in the cheek or under the tongue. This allows the Melatonin to be absorbed directly into the body.
Some people take Melatonin by mouth to adjust the body’s internal clock. Melatonin is most commonly used for insomnia and improving sleep in different conditions. For example, it is used for jet lag, for adjusting sleep-wake cycles in people whose daily work schedule changes (shift-work disorder), and for helping people establish a day and night cycle.
How does it work?
Melatonin’s main job in the body is to regulate night and day cycles or sleep-wake cycles. Darkness causes the body to produce more Melatonin, which signals the body to prepare for sleep. Light decreases Melatonin production and signals the body to prepare for being awake. Some people who have trouble sleeping have low levels of Melatonin. It is thought that adding Melatonin from supplements might help them sleep.