These are the products that I keep on hand during flu season:
I use these only when I am sick. They are not for daily supplementation. I do not use all of them at the same time. I *do* use them the moment I start to feel sick. I can usually avoid getting sick, if I eat well, rest, and take some supplements as soon as I start to feel ill.
Colloidal Silver - the size of the particles and the strength is important. ACS is the best brand I have found so far. Use frequently and liberally.