Lysine is an essential amino acid, meaning it is necessary for human health, but the body cannot make it.
Lysine appears to help the body absorb calcium, and it plays an important role in the formation of collagen, a substance important for bones and connective tissues including skin, tendons, and cartilage.
It may help reduce anxiety, prevent cold sores, improve calcium absorption, and promote wound healing.
Not enough lysine may cause:
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fatigue
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poor concentration
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irritability
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nausea
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red eyes
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hair loss
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inhibited growth
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anemia
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problems with the reproductive system