What is 5-HTP? The Griffonia Extract is rich in 5-HydroxyTryptophan (5-HTP), which comes from an African vegetable, the Griffonia simplicifolia seed, and contains 30% 5–HTP. 5-HTP is an amino acid that is a direct precursor of serotonin, an important neurotransmitter having pain soothing and relaxing effects. 5-HTP is not present in significant amounts in a […]