Amino acids, commonly referred to as the "building blocks of protein”, promote a variety of metabolic processes including digestion, tissue repair and aiding muscle growth. There are 3 types of Amino Acids, Essential Amino Acids (EAA): There are 9 total EAA's (histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine) that cannot be synthesized by the human body and must be supplied from diet. Branched Chain Amio Acids (BCAA): Branched chain refers to the chemical structure of these amino acids (leucine, isoleucine, and valine). BCAAs stimulate the muscle protein synthesis and possibly reduce muscle breakdown. BCAAs stimulate lean muscle protein synthesis, and the recovery process is accelerated when paired with EAAs. Non-Essential Amino Acids (NEAA): NEAA can be synthesized by the human body.