The purpose of the recent study was to re-visit the early research done on cat cells. This research group corrected some of the technical flaws in the original research and then analyzed the effect of increased dosage levels of L-lysine on herpes virus reproduction. They found that increasing amounts of L-lysine in the cell cultures had little effect on suppressing herpes virus reproduction. These laboratory findings are consistent with the research performed in cats with herpes virus. Contrary to popular veterinary belief, these researchers found the results of their study, as well as the studies in cats, offer little scientific justification for the use of L-lysine in the treatment of feline herpesvirus 1 in cats.