A scientific blend of the 9 essential amino acids (EAAs) that your body (including muscle) needs: leucine, lysine, valine, isoleucine, threonine, phenylalanine, methionine, histidine and tryptophan. (Leucine, valine and isoleucine are collectively known as the branched-chain amino acids, or BCAAs). The EAAs in Amino Synergy come from fermented, non-GMO vegetable material, not animal sources such as feathers or hair.