NOW Amino Complete contains a balanced blend of the following essential and non-essential amino acids: L-Alanine, L-Arginine, L-Aspartic Acid, L-Cysteine, L-Glutamic Acid, L-Glycine, L-Histidine, L-Isoleucine, L-Leucine, L-Lysine, L-Methionine, L-Ornithine, L-Phenylalanine, L-Proline, L-Serine, L-Threonine, L-Tryptophan, L-Tyrosine and L-Valine.