Of the hundreds of different amino acids, only 20 are used by our body to synthesize proteins. These are further classified as essential and non-essential amino acids. Essential amino acids cannot be synthesized by the human body and must be obtained from dietary sources. They include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. ... https://www.coherentmarketinsights.com/market-insight/amino-acid-market-5757