TRIBULEX Xtreme contains four of the highest quality testosterone stimulating herbal extracts known to man. I kid you not when I say we have gone to great extremes in order to obtain these raw materials. Quality raw materials are essential for the function of a quality product. In summary, TRIBULEX Xtreme - the Natural Testosterone Igniter - is pure raw testosterone power. This product is designed to stimulate gonadal function thus causing a super charged release of total and active testosterone. This increase in testosterone may promote muscle mass, strength, endurance, and recovery.