Alpha Yohimbine HCL 90% is a fat-loss and performance-enhancing supplement used by athletes and bodybuilders. It is a more potent form of Yohimbine HCL, known as Rauwolscine, and works by blocking alpha-2 adrenergic receptors on fat cells. This action promotes the breakdown of fat and increases the release of norepinephrine, a hormone that boosts energy and metabolism.