BCAAs are especially important for bodybuilders since they comprise a large percentage of the amino acid composition of muscle. BCAAs are also the only aminos that are directly metabolized in the muscle as opposed to the liver. Provided dual benefits since BCAAs can be used to build protein or broken down in muscle to supply a direct source of energy. BCAAs provide muscle nitrogen support for a variety of metabolic functions, which can be especially important during heavy training. Sustained release formula allows you to maintain BCAA concentrations in the body-take servings six hours apart to optimize BCAA levels.