I had to stop taking probiotics a while ago cause they give me pain in my colon. The pain pretty well starts within half an hour when I take it. Starts in the right side to middle. Then eventually works its way to left side. Then takes me days to get rid of colon spasms from that. I tried probiotics for babies by Natren, with the logic that if baby can handle it so can I LOL. And I have no reaction to them. They make me feel good (although not all my problems are gone). But then I got the idea I would graduate to the adult Natren probiotics, and instant pain. So now I'm back to the baby ones again. I find it so frustrating. And there is no FOS or prebiotics in the Natren probiotics so I was hoping they would work for me. Anyone else have reactions to probiotics?