"I'm sure others will disagree, but I don't think probiotics do that much good anyway....just my opinion!" - Hellth.
I agree. They are supposed to get into the intestines and take up residence in the same places that are frequented by the bad bacteria. What are the bad bacteria supposed to do? Commit suicide? Nay. Are they strong enough to fight the bad bacteria? Maybe, if there are enough to overwhelm them.
If you are eating fermented products, such as yogurt or sour kraut, you should get plenty of good bacteria. If you still have your appendix, this should be an ample amount.