Lysine is an amino acid not produced by the body, but essential to the growth of protein molecules in the body. It is necessary for tissue repair and growth, and for producing antibodies, enzymes, and hormones. Lysine is found in other protein sources, such as red meats, chicken, and turkey. Most individuals have an adequate intake of lysine but lysine levels may be low in vegetarians and low-fat dieters. Without enough lysine or any other of the eight essential amino acids the body cannot build protein to sustain muscle tissue.
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