L Lysine amino acid

L-Lysine is an amino acid available as a supplement

Lysine and herpes simplex

At this point, it appears that some studies show lysine to be helpful in herpes treatment or prevention, but several more studies are needed to confirm or refute these findings before we can make any firm recommendations for the use of lysine in herpes treatment. My overall impression thus far is that if lysine does help a herpes infection or if lysine prevents a herpes infection, its effects are most likely mild. Although the role of lysine in herpes has been studied off an on for quite a number of years, no firm conclusions can yet be made. I have listed some of the L lysine and herpes studies at the bottom of the page. The ideal dosage of lysine for herpes prevention is not known at this time and the long term side effects of lysine, if any, are also not known. Thus far no significant l lysine side effects have been reported in the medical literature.

L-Lysine supplement questions
Q. Is it safe to continue taking L-Lysine for cold sore prevention during pregnancy?
   A. We have not seen any studies evaluating L-Lysine during pregnancy, so it would not be proper for us to say it is safe, but we have no evidence to say that it is not safe. Most herbs, amino acids, and supplements have not been tested for safety in pregnant women.