Melatonin is a hormone secreted by mammals and the pineal gland of the human brain, and it has a variety of biological roles, including regulating sleep and wake cycles, antioxidant, anti-inflammatory, and neuroprotective. The main role of melatonin is to induce sleep, remind people that it is time to sleep, and shorten the time to fall asleep and improve sleep quality. In addition, it also has a powerful antioxidant effect, which can remove free radicals in the body and protect cells from oxidative damage. At the same time, melatonin also has anti-inflammatory effects, can reduce inflammation, relieve pain and swelling and other symptoms, and has a certain effect on the treatment of arthritis, gout and chronic pain.