BCAA’s include leucine, isoleucine and valine. They are needed for the maintenance ofmuscle during physical stress and exercise. Research shows that supplementation withbranched-chain amino acids can prevent central fatigue by tightly regulating the influx oftryptophan to the brain. Supplementation before and during exercise has been proven toenhance performance. BCAAs function as anabolic agents and induce sparing, whichallows the body to burn fat and not muscle. Ultimate Nutrition used only the finest USPquality amino acids for this formula.