Forgot to mention VSL#3 probiotics. My GI doctor recommended them to keep my SIBO (small intestinal bacterial overgrowth) in check. It's worked better than antibiotics and Costco pharmacy carries them for a little cheaper. Some people have GI issues subside with strong probiotics like VSL#3. Lower count probiotics, especially with prebiotics like FOS, MOS, INULIN, CHICORY, etc, can actually make some people worse off. If one is prone to SIBO, which I tested positive for and am prone to due to having slow motility, basic probiotics make it worse. They have to be strong enough and not contain prebiotics or they just feed my overgrowth instead of get rid of it. I took 2 capsules of VSL #3 for a month and now only one capsule daily or every other day. Taking only 1 capsule a day max makes the bottle last 2 months for me, which is only $24 a month. If you try a potent probiotic like VSL #3 or one similar, and it helps, you probably have an overgrowth like SIBO. It's a better a option than repeated antibiotics to treat SIBO. Mine kept coming back either way because of my motility disorder, which is blamed on my connective tissue disease EDS. So my GI doc just put me on VSL#3 instead and it works well. They don't require a prescription. Natural food stores also carry potent refrigerated probiotics. You just want to look for at least 50 billion count, preferably 100 billion count, with more than a few strains of bacteria (8-10 strains of bacteria is really good).