Essential amino acids cannot be made by the body.

Essential amino acids cannot be made by the body itself. As a result, they must come from food. The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine,phenylalanine, threonine, tryptophan, and valine.

The essential amino acids are arginine (required for the young, but not for adults),histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

People must obtain nine of these amino acids, called the essential amino acids, through food. Good dietary sources include meat, eggs, tofu, soy, buckwheat, quinoa, and dairy. Amino acids are compounds that combine to make proteins.

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