noun Download 🔗Share A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep/wake and reproductive cycles in mammals Examples : "Many people take melatonin supplements to help them fall asleep more easily at night. " physiology biochemistry medicine biology substance body organ Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share Any material similar in its chemistry and effect to the natural hormone. Examples : "Taking a low dose of melatonin before bed can help some people fall asleep easier. " medicine physiology biochemistry body substance chemistry Chat with AIVocabulary GamePractice Reading