Ultra micronized max bioavailability. Nitric oxide performance. Enhances blood flow to muscle. Increases endurance. Decreases recovery time. 5-HTP supports healthy serotonin levels & mood. 5-Hydroxytryptophan (5-HTP) is a chemical that the body makes from tryptophan (an essential amino acid that you get from the diet). After tryptophan is converted into 5-htp, the chemical is then changed into another chemical called serotonin, a neurotransmitter, which relays signals between brain cells. 5-HTP dietary supplements help raise serotonin levels in the brain. Serotonin helps regulate mood and behavior meaning 5-HTP may have a positive effect on sleep, mood, anxiety, appetite, and pain sensation. Some doctors consider 5-HTP to be the best natural appetite suppressant.