Anyone with C. Diff or even chronic diarrhea really must try Florastor. It is a yeast Saccharomyces boulardii (S. boulardii) and I've talked to two different people with Chrohn's disease who use. I used after I had to be on several different antibiotics and could not get rid of irritable bowel in which I had painful diarrhea which would empty me out once a week. Most doctors do not know about it. FLORASTOR!