L-Lysine for URI?

[onster]

Poor Bunduk has a kitty cold again, the little guy is looking quite sorry for himself, sniffling and sneezing.

This is kind of normal for Bunduk as he had an upper respiratory infection when we adopted him and it took him several months to shake it off. Since it was probably the herpes virus he's going to have deal with this all his life. I dont plan on taking him to the vet unless it goes beyond whats normal for him.

Anyway, when I put him in boarding he got his usual cold along with coughing and they gave him L-Lysine to boost the immune system. I was wondering if it really works to shorten the duration/severity of the cold?

So far Ive made him some chicken soup (my vet told me about that when he was a kitten) and gave him some extra cuddles