Melatonin tablets have the effect of regulating sleep, immune regulation, anti-aging, etc. Side effects include creating dependence, dizziness and nausea. The main components of melatonin tablets are melatonin and vitamin B6, which can improve the immunity of the body. For people with sleep disorders, melatonin can improve the quality of sleep, maintain the level of melatonin in the body at a youthful state, and improve the functional state of the body. Melatonin can also scavenge free radicals in the body, antioxidant and inhibit peroxidation reaction, thus protecting cells, avoiding DNA damage and slowing down aging; Melatonin can reduce the generation of DNA-adding substances induced by the chemical carcinogen safrole and protect DNA. Melatonin tablets, if used in excess, may make the body dependent on it, some people may experience dizziness, nausea and other discomforts after taking it, if intolerance is required to follow the doctor’s advice to stop taking it or seek medical advice in time. Caution is advised for pregnant and lactating women, children and the elderly. Melatonin tablets need to be taken under the guidance of a doctor, can not be taken arbitrarily, the process of taking any discomfort, need to stop the drug and seek medical attention.