Melatonin is a hormone secreted by the pineal gland, an endocrine gland buried deep in the brain that regulates sleep.* It is responsible for regulating biological rhythms in humans.* Melatonin is a powerful antioxidant and free radical scavenger.* There is evidence that Melatonin acts to support the immune system.* As we age, the natural production of Melatonin tapers off.*