Melatonin is a potent free radical scavenger naturally produced in the pineal gland and the GI tract.* 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, maintenance of GI health, and aspects of immune system function.* Supplemental melatonin has been shown to support healthy sleep patterns especially when travelling across time zones or for shift workers.* This Maximum Strength Melatonin 20 mg has twice the Melatonin as in our Extra Strength 10 mg product.