L-Lysine is one of the Essential Amino Acids, the amino acids that our bodies need but can't make. NOW L-Lysine (1000mg) provides a huge dose of pure L-Lysine in a vegetarian friendly tablet. What does L-Lysine do for you? It's a vital component of all proteins in our bodies, and is especially important in building muscle protein. L-Lysine also aids calcium absorption as well as recovery from sports injuries and surgery. Enzymes, antibodies and hormones all depend on L-Lysine for their production. To get the L-Lysine your body needs every day, you'd be hard pressed to find a better source than NOW L-Lysine.