Tongkat Ali, also known as Long Jack, has been shown to support male hormonal balance (including testosterone availability), libido and performance, according to animal studies. Tongkat Ali is a Southeast Asian botantical used traditionally to enhance energy levels, endurance and stamina, and to reduce occasional mental fatigue.* * These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.