Serotonin is a neurotransmitter and hormone influencing mood, digestion, sleep, and healing. Produced mostly in the gut from tryptophan, it helps stabilize emotions, regulate bowel movements, and ...

This feel-good hormone plays a key role in everything from sleep and digestion to happiness and contentment—here's how to keep it flowin'. Serotonin is a “feel-good” hormone, or neurotransmitter, that ...