N-acetyl-5-methoxytryptamine or melatonin is a hormone secreted by the pineal gland in the brain. It helps regulate other hormones and maintains the body’s circadian rhythm. Melatonin used as medicine is usually made synthetically in a laboratory. It is used for Insomnia (sleeping problems), Benzodiazepine Withdrawal, Breast Cancer, Prostate Cancer, Jet lag etc. If you are considering using melatonin supplements (available as tablets, capsules, cream, and lozenges), please talk to your doctor first.