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Serotonin is a major regulator of mood and depression risk. These are important, vital roles, to be sure. Your mood describes how you experience and interpret the world. If it\u2019s consistently bad, you\u2019regoing to have a rough time. Yet, serotonin is much more than\xa0the \u201cfeel-good hormone.\u201d It also influences\xa0sexual desire and helps us remember. It\u2019s the precursor to melatonin, the neurotransmitter that allows us to sleep.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)