BCAA Xpress Sugar-free Gluten free Lactose-free Contains a 2:1:1 ratio of branched-chain amino acids 5g pure BCAAs per serving Leucine, isoleucine, and valine are part of the branched-chain amino acid (BCAA) family. BCAAs are essential amino acids for humans that the body cannot produce, so it is important to obtain them through diet or supplements. They represent approximately 35% of the essential amino acids in muscle proteins. The right amount and type of amino acids are crucial for growing and maintaining muscle mass. BCAA Xpress contains branched chain amino acids in a 2:1:1 ratio, as they are naturally found in the body. It offers a convenient way to supplement these amino acids. It is also flavored for a more pleasant taste experience.