Hey Amy,
I can say from my experience that Lysine does not do anything fr cold sores! I've been taking it regularly now for 1.5 months and have a brutal split lip that isn't going away. The dry weather always does this to me, but Lysine isn't helping one bit. I did hear that helps to reduce or control hemoptosis and possibly (I'm hoping) reduces inflammation. I'm still looking into that. I don't think it'll do anything like that in a major way though.
I've taken it for years every so often at night to relax my muscles so I can go to sleep more easily. That, it does do well.
Someone a while back mentioned MedImmune Plus, but I never really understood the full picture on it. If you find anything, please let me know. Thanks!!
Have a good day!