6Pak Nutrition BCAA Instant Pak 400 gAmino acids, including branched chain amino acids (BCAAs), are components of proteins, ie the main functional and building blocks of every cell in the human body. Branched chain amino acids are classified as exogenous amino acids and therefore need to be supplied through the diet as they are not synthesized by the body. The storehouse of branched chain amino acids is primarily muscle tissue, where BCAAs make up about 14 18% of its structure. Branched