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It must be obtained through the diet or by supplementation. Lysine is one of the most well known amino acids and is an essential component of all proteins. The function of Lysine is to ensure adequate absorption of calcium, and to form collagen. Promotes growth, tissue repair and production of antibodies. One new discovery for Lysine is that it may inhibit the virus that causes cold sores, or fever blisters. Some deficiencies of lysine are fatique, loss of energy, inability to concentrate, irritability, hair loss, and anemia. 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