Serotonin Starts in the Stomach Did you know that about 95% of the body’s serotonin is actually found in the gut? Serotonin is often called the “feel-good” neurotransmitter because it helps regulate mood, emotions, and even digestion. When our gut is in balance, our emotional world often feels steadier too. If you enjoy reading, The Mind-Gut Connection by Dr. Emeran