Rivalus Steam BCAA helps you tran longer and harder, and supports faster recovery with a Powerful combination of BCAAs (2:1:1 ratio). Plus it adds Glutamine, Citrulline, Electrolytes, and Vitamin B6. About a third of skeletal muscle, the type of muscle that flexes and gets stronger when you workout, is made up of branched chain amino acids or BCAAs. For this reason athletes requirements for leucine, isoleucine, and valine are higher. Supplementing with these key amino acids have been scientifically demonstrated to improve performance.