Klean Athlete BCAA + Peak ATP PowderKlean Athlete BCAA + Peak ATP Powder Whether youre looking to improve lean muscle mass, support post workout recovery*, or simply get stronger Klean BCAA + Peak ATP is the BCAA for you! Amino acids are known as the building blocks of proteins in the body. They aid in the growth of tissues, organs, and most importantly for athletes muscles! Branched chain amino acids consist of leucine, isoleucine, and valine, which work together to stimulate muscle