Lysine is an essential amino acid which means that the body cannot create it so it must be obtained from an outside source. Lysine plays an important role not only in muscle building but also in calcium absorption, recovering from surgery or injuries, and the production of enzymes, hormones, and antibodies. Lysine is one of the most widely used amino acids in the world as it is essential not only for human health but is used in animal feed as it is vital to the immune system.
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