Healthy Sleep Cycle Two Stage Release With Co-Factor Nutrients Non-GMO A Dietary Supplement Vegetarian -Vegan General Health Family Owned Since 1968 GMP Quality AssuredMelatonin is a potent free radical scavenger naturally produced in the pineal gland. It is involved in many of the regulatory of glandular secretory functions related to the maintenance of normal sleep/wake cycles and aspects of immune system function. Melatonin is also produced in the GI tract, where is it essential for the maintenance of a health gastrointestinal lining.