Melatonin LiquidNutritionally augments the natural functioning of the pineal gland supporting the body's natural sleep cycle* Melatonin is a hormone produced by the pineal gland, which regulates the body's sleep wake cycle. Melatonin's primary role is regulation of the body's circadian rhythm, endocrine secretions, and sleep patterns. Studies indicate that it facilitates the onset of sleep, as well as sleep efficiency.* 2. 5 mg of micronized melatonin per 1 ml