lol love the liberal sarcasm. Dr Ardis said actually all you need is vitamin C about 5000 units per day. But you can also use vitamin C and zinc, these should be good enough to combat it. Also note that if you are taking 5000 units of vitamin C a day and get the runs then cut it back some that is an indication you are taking more than you need. Dont know about keeping you from getting sick but it will keep you from being hospitalized and will shorten the amount of time you would have had it.