Linus Pauling, Nobel prize winner in chemistry touted that vitamin C was a cure-all for everything from preventing colds to curing cancer. He died of cancer in 1994. In spite of some other outrageous claims, vitamin C is still good for you, it just doesn't cure everything. Also, don't take the chewable kind, because it is ascorbic acid and will rot your teeth if you chew too much of it.