L-Leucine L-Isoleucine and L-Valine are commonly grouped together and referred as Branched Chain Amino Acids or BCAAs because of their unique branched chain chemical structure. BCAA and L-Glutamine are essential amino acids the BCAA make 40 percent of the daily requirement of all nine essential amino acids and makeup to 35 percent of all muscle tissue. BCAA with L-Glutamine supports muscle development minimizes muscle tissue loss during exercise and speed up recovery.