L-Lysine is an essential amino acid, which means the body requires it but cannot produce it on its own. It is a key player in the production of various enzymes, hormones and disease-fighting antibodies.
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L-Lysine is also responsible for producing collagen, which helps repair torn tendons, muscles, ligaments and skin. It helps the body absorb calcium and prevents bone loss associated with osteoporosis. Perhaps most notably, L-Lysine prevents recurrences and reduces the severity and healing time of cold sores, also known as fever blisters, and oral herpes.