Serotonin deficiency causes depression, mood disorders
A serotonin deficiency can cause depression and mood disorders. Serotonin is a chemical naturally found in the body that carries signals between nerves. It is produced in the brain and the intestines; in fact, about 80 to 90 percent of it can be found in the gastrointestinal tract. Serotonin has long been thought to be ...click here to read more