I've actually used L-lysine when I feel like I'm getting a cold sore, and they've also used L-lysine with the FIV+ cats at the shelter. There was also an Immune Support herbal capsule that we would take apart and mix in their canned food. I used that with Bear because his immune system was so weak. Viruses are nasty little things to deal with, because they go away when they feel like, unlike the bacterial infections that will clear up with antibiotics.
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