5-HTP 50 mg, 180 Capsules, NOW FoodsNOW Foods 5 HTP 50 mg Neurotransmitter Support. Natural Source. Supports Positive Mood. 5 HTP, the intermediate metabolite between the amino acid L tryptophan and serotonin, is extracted from the bean of an African plant (Griffonia simpicifolia). Supplement Facts Serving Size 1 Capsule Amount Per Serving % Daily Value 5 HTP (5 hydroxytryptophan) (Griffonia simplicifolia) (Seed) 50 mg Other Ingredients: Rice Flour and Gelatin (capsule). Contains no: