Standard amino acids Alanine Arginine Aspartic acid (aspartate) Asparagine Cystine Glutamic acid (glutamate) Glutamine Glycine Histidine Isoleucine (branched chain amino acid) Leucine (branched chain amino acid) Lysine Methionine Phenylalanine Proline Serine Threonine Tryptophan Tyrosine Valine (branched chain amino acid) Other amino acids Theanine