Naturally occurring in almost all living things, melatonin is a sleep aid, powerful antioxidant - specifically helping the protection of nuclear and mitochondrial DNA. Vivitas Melatonin Capsules can be used to improve thyroid function, improve fertility in women, and prevent breast cancer. As a sleep aid, melatonin is an all natural alternative to prescription or over-the-counter sleep aids. It works by "resetting" your sleep cycle so you fall asleep when you are supposed to. Maybe you will even wake up before your alarm goes off!