5-Hydroxytryptophan (5-HTP) is an amino acid extracted from the Griffonia seed, as well a natural occurring substance in the human body. It is the step between the conversion of tryptophan to serotonin, an important brain chemical. Serotonin is also known as the “feel good hormone” and is responsible for good mood and preventing excessive appetite. 5-HTP is non-addictive. When 5-HTP is combined with vitamin B6, brain serotonin levels are raised 60% more effectively than alone.