L-leucine, l-isoleucine and l-valine are commonly grouped together and referred to as branched chain amino acids or bcaas, because of their unique branched chemical structure. Bcaas account for 33 percent of all muscle protein. Bcaas are essential, which means that they must be consumed through diet, since the human body cannot synthesize them in any other way. Bcaas have long been used by both, strength and endurance athletes to help activate muscle protein synthesis and reduce muscle breakdown. Proburst bcaas are made using high quality instantized grade bcaas and help deliver a premium quality supplement to its users.