Melatonin is an amine hormone produced by the pineal gland that regulates sleep quality, antioxidants, and immune regulation, also known as the pineal hormone. Melatonin can reduce sleep wake-up time and fall asleep time, thus ensuring adequate sleep time and sleep quality. Melatonin can also play a role in alleviating melanin deposition, antioxidant effect, can play a role in delaying skin aging. Melatonin also plays an important role in regulating the human immune system. Melatonin regulates the immune system and increases immunity by participating in the synthesis of immune cell components and regulating the movement of cytokines. When melatonin is used as a health food, it has the health function of improving sleep, and people often take melatonin for insomnia because of this, but it should not be used as a substitute for medication. Pregnant women and people with insufficient liver and kidney function should also avoid taking melatonin. It should also be noted that melatonin can not be taken together with aspirin. Consult your physician for specific treatment.