Plant Source: African Plants Yohimbine� s bark Main Ingredient: Yohimbine hydrochloride Specification: 8% , 98% ( HPLC) Molecular formula: C21H26N2O3HCL Molecular Weight: 390.91 Appearance: 8% is black brown powder, and 98% is white powder Function: It can increase muscle tension, has a noninvasive effect on suppression of urine, accelerate body energy metabolism, and increase energy supply.