An example is carcinoid syndrome, a disease in which carcinoid tumors produce excessive serotonin.

He believes that "the drawing process produces serotonin and endorphins in certain individuals. . . . There must be some physical reward for some people.

Tryptophan is needed for the body to produce serotonin.

It contains tryptophan, which helps the body produce serotonin, a natural feel-good chemical that may play a role in sexual arousal.

Isolating the lower spine, Dr. Privat said, had killed the nerve cells producing serotonin.

This was partly corrected in those with transplants that produced serotonin.

(Carbohydrates tend to shoot messages to the brain to produce serotonin, which induces sleep.)

In this case, the greater aggregation of platelets produce ADP, serotonin, and thromboxane A2.

Carbohydrates also cause production of tryptophan, an amino acid needed to produce serotonin.

Without carbs, your brain actually can't produce serotonin.