PART USED:BarkSPECIFICATION: Yohimbine 1%--98% Test By HPLC INDICATIONS: Yohimbe has been one of the most popular supplements for men and women for years. When ingested, the body converts it to yohimbine and assimilates it into the bloodstream. Yohimbe comes from the bark of a tree that grows primarily in West Africa. Yohimbine, an alkaloid, is the primary active ingredient of yohimbe.