BCAAs are ideal for preserving lean muscle mass and preventing muscle catabolism. Protein provides the building blocks necessary to rebuild and repair muscle tissue after exercise. These proteins are subsequently deconstructed and broken down into amino acids. Each of the 22 amino acids in the body has a specific function. In addition, there are nine essential amino acids that the body cannot synthesize and must be obtained through food or supplements (supplied by BCAAs). Due to the fact that BCAAs are digested within the muscle, they can be used for both muscular growth and energy during exercise.