Melatonin is a neurohormone that is naturally released from the pineal gland and mostly known to regulate sleep.
Melatonin is a hormone produced in the pineal gland, located in the brain. Melatonin is involved in the natural sleep cycle, and is thought to play a role in the regulation of other hormones. Melatonin supplements are used to treat jet lag and insomnia. Melatonin may also have antioxidant activity, and may help protect cells from damage.