| http://www.w3.org/ns/prov#value | - Sleep, Dreams, Youth, and Melatonin Tuesday, 02 October 2007 10:10 TweetMelatonin is not a vitamin, it is a hormone particularly active in the hypothalamus and pituitary gland, and its major function is to coordinate some of the internal systems of the body, especially brain, immune and reproductive systems, in relation to the light-dark cycles of the day and the changes in length of day and night
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