ECHINACEA is a known cure all for many acute immune system illnesses.

It comes in many forms like extract, capsules or root powder (for making your own remedies). Stay away from the cheap store brands, which contain extra unnecessary junk. Gaia Herbs, Futurebiotics and Herb Pharm are all good brands. I buy the dried herbs myself and make my own capsules and tinctures. It's a LOT cheaper and easy to do.