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Proteins, Page 4

Essential and Non-Essential Amino Acids

Essential amino acids are those that our body cannot synthesize and must be acquired through our diet.

These eight essential amino acids are: 

  • isoleucine
  • leucine
  • lysine
  • methionine
  • phenylalanine
  • threonine
  • tryptophan
  • valine

There are twelve primary non-essential amino acids (plus another eight minor non-essential which we will not discuss in this section). These non-essential amino acids can be manufactured by the body and/or obtained through the diet.

Table of Amino Acids

*These are not found in body tissue structure, but contribute to human metabolism.