L-lysine is an essential amino acid, which must be obtained from food or supplements because your body cannot manufacture it. L-lysine is a building block for collagen and elastin, proteins that are used to make the connective tissue found in tendons, ligaments, and blood vessel walls. L-lysine also encourages immune system and bone health.

Note: Individuals with kidney or liver disease should consult a physician before taking l-lysine.

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