oregano oil and NAC you can get easily and will make a big difference!
I go with the horrible taking super strong oregano oil extract which is prob what you want. its expensive too, it should be, think to spend like 30-40 bucks for tiny dropper btl.
works great on mouth infection too, like put it on and is gone in a day or two.
natural antibacterial/antiviral
should be part of the supplement first aide kit! lol