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Melatonin is a hormone secreted by the pineal gland of the brain, also known as pineal hormone, melatonin, melatonin, its synthesis is controlled by our nervous system, with an obvious circadian rhythm, that is, the secretion is suppressed during the day, and the secretion is active at night.link:https://www.tongzebio.com/active-pharmaceutical-ingredient/melatonin-raw-powder.html