Melatonin is a hormone secreted by the mammalian and human pineal gland,which has various biological functions,including improving sleep quality,anti-aging,and protecting blood vessels.Specifically,melatonin has the effect of promoting sleep,shortening the time to fall asleep,improving sleep quality,reducing the number of nighttime awakenings,and extending deep sleep time.In addition,melatonin is also a very strong antioxidant,which can remove free radicals in the body,delay aging,and have the effect of beauty and beauty.Melatonin also has a protective effect on blood vessels.