It can be used to keep viruses in check in cats. For example, it is estimated that up to 95% of household cats in the UK have the Herpes virus, and many also have the Chlamydia virus. The use of L-Lysine can help the cats body to keep the virus in check. It is one of the 12 essential amino acids (found in protein - especially in raw food diets) that needs to be supplied through the cats diet (as opposed to the other 12 amino acids, which the cats body can produce itself).
