Melatonin does not have a direct whitening effect, but after taking melatonin can improve human sleep and have a certain antioxidant effect, if the patient’s sleep quality becomes better, the skin may become glossy and feel whiter. Melatonin is one of the hormones secreted by the pineal gland of the brain, which has the effect of shortening the human body’s sleep time and reducing the number of sleep awakenings, thus improving the human body’s role in sleep; at the same time, melatonin is also a free radical scavenger to prevent cells from producing oxidative damage and slowing down the aging process, so it does not have its own whitening effect. But the quality of human sleep has improved, the skin can also get enough rest at night, so the skin will become glossy looks like whitening. It should also be noted that adolescents, pregnant and lactating women, patients with autoimmune diseases and psychiatric patients should not be taken, there is a lack of clinical safety indicators, so it is recommended that when you need to take it under the guidance of a doctor, so as not to cause damage to liver and kidney function.