5-HTP, the intermediate metabolite between the amino acid L-tryptophan & serotonin, is extracted from the bean of an African plant (Griffonia simplicifolia). If you are currently taking antidepressant medications please consult a physician prior to use. May cause drowsiness. As a dietary supplement, take 1 Vcap® daily, preferably on an empty stomach at bedtime. Consider taking this product in combination with NOW® Valerian Root, Relora® & Pantothenic Acid. Rice flour and Cellulose (capsule).