Gastrointestinal Support* With Co-Factor Nutrients Melatonin is a potent free radical scavenger naturally produced in the pineal gland.* It is involved in many of the regulatory processes of the body, including regulation 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 it is essential for the maintenance of a healthy gastrointestinal lining.* Natural color variation may occur in this product.