My thinking: Stomach acid (ideally) should kill any bacteria that comes through. Obviously that doesn't work 100% of the time because food poisoning/travelers diarrhea is a thing. But, is that controllable? Like, how could you force probiotics through the stomach unharmed? Maybe by taking them first thing in the morning in a liquid solution that will pass through the stomach quickly. But, does doing it that way leave you open to SIBO since you're basically pumping your upper GI full of live bugs in large quantities? If SIBO is a risk from oral probiotics, is a probiotic enema the better delivery method? With enema it seems hard to deliver the bacteria to all parts of the large bowel. Just thinking through these things. Any input would be welcome. I know the GAPS diet book suggests probiotic enema. But it also suggests fermented foods, which are way more packed with bugs than a capsule.