Essential Amino Acids

Essential Amino Acids are amino acids that your body does not have the ability to synthesize. Hundreds of different amino acids exist in nature, and about two dozen of them are important to human nutrition. Nine of these histidine, isoleucine, leucine, lysine, methionine, phenylalanine, theronine, tryptophan, and valine?are considered essential, since they must be supplied by your diet.