Lysine may help to slow down or prevent the growth of the herpes simplex virus type 1 (HSV-1), which is responsible for cold sores. HSV-1 requires arginine, which is another amino acid, to grow. Lysine helps prevent the body from absorbing arginine, making it difficult for HSV-1 to grow and reproduce.

How effective is lysine for herpes?

88% considered lysine effective for herpes. 60% of subjects with cold sores without medical therapy said their symptoms were severe before taking lysine versus 4% with lysine.

How much lysine should you take to prevent herpes?

These studies have claimed that lysine helps in healing and preventing cold sores. The recommended daily dose for prevention is between 1500-3000mg. If you feel an outbreak coming on, you will want to increase your dosage to 3000 mg. Continue this dosage until scabbing occurs.