Melatonin is a hormone primarily responsible for regulating the sleep-wake cycle. It is widely used in health supplements and pharmaceutical products to promote restful sleep and alleviate sleep disorders like insomnia and jet lag.

Melatonin can improve the function of the endocrine system, improve immunity, improve anti-stress and antioxidant functions, improve sleep, slow down the aging speed of the human body, and slow down the degeneration of sexual organs.

Melatonin is an amine hormone mainly produced by the pineal gland of mammals and humans. Human pineal gland is a bean granular tissue attached to the posterior wall of the third ventricle. It has also been reported that the retina and accessory lacrimal glands of mammals can also produce a small amount of melatonin; Melatonin can also be synthesized in the eyes, brain and skin of some thermophilic animals (such as frogs) and some algae.