BCAA Xpress Sugar-free Gluten free Lactose-free Contains a 2:1:1 ratio of branched-chain amino acids 5g of pure BCAAs per serving Leucine, isoleucine, and valine are branched-chain amino acids (BCAAs), which are essential for the human body. BCAAs account for approximately 35% of the essential amino acids in muscle proteins. Proper amino acid intake is important for the growth and maintenance of muscle mass. BCAA Xpress provides branched chain amino acids in a 2:1:1 ratio, as they are naturally found in the body. It is a convenient option for supplementing these amino acids, being flavored and providing a pleasant taste experience.