Amino acids are the principal building blocks of proteins and enzymes. Amino acids are also required in a precise proportion or ratio for eachbody protein. Nine amino acids are generally regarded as essential for humans: phenylalanine, valine, threonine, tryptophan, isoleucine, methionine, histidine, leucine, and lysine. Essential amino acids are those that can't be produced in the body, so you get these from foods or supplements.
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