BCAAs are the only aminos that are directly metabolized in the muscle as opposed to the liver. BCAAs also provide muscle nitrogen support for a variety of metabolic funtions, which can be especially important during heavy training. Met-RX BCAA utilizes the best of BCAA as the Met-RX labs process the ingredients to enhance the capability in normal way. Hence, Met-RX BCAA is one of the best BCAA supplements available in the market.