My 1.5 year old was getting sick every 1.5-2months ( sneezing, pink/red eyelids and eye discharge) since he was a kitten. Vet treated him always but didnt explain to me whats making him sick.. so because iwas worried about the frequency of symptoms i took him to another vet who told me he had feline herpes but didnt recommend anything. Now my boy has a flare up again and i was researching a little bit on this topic and found something about Lysine which helps flare ups, i did not find any in the vets store and pet stores. Only one i could find is in the human pharmacy, lysine capsules 500mg. Are they safe to use on my cat to try and prevent his flare ups?