So finally, athletes & bodybuilders have a natural alternative to steroids & untested prohormones to boost their testosterone levels, which of course would be expected to enhance muscular recovery from exercise, increase strength & accelerate the muscle-building process. As with all PVL Essentials products, their D-Aspartic Acid is certified, researched, tested & athlete-approved. • Shown to increase testosterone in humans by 42%• Natural, not a steroid or prohormone• Increased testosterone can enhance recovery, muscle mass & strength