Doctor's Best BCAA Powder, Instantized contains a blend of L-Leucine, L-Isoleucine and L-Valine, which are essential amino acids that the body cannot synthesize on its own and therefore must get through dietary sources. BCAAs, unlike most other amino acids, are metabolized within muscle tissue, allowing them to be used as energy by muscle cells to produce cellular energy in the form of ATP.* Doctor's Best BCAA Powder is unflavored and gluten free.