If you take the yeast-based probiotics, let your dr know if you get a
yeast infection (vaginal, mouth, skin, whatever), because the
yeast infection can team up with the probiotics and cause problems. Not often, but fyi. (It happened to me, but only after a very long time of taking them, and I also accidentally was taking too much of them. Quite rare for this to happen.) The advantage to the yeast-based probiotics is that they are supposed to be a strong defense against C.