I'm curious too about which IBS this is for. I read the long thread SIBO, but in some cases it sounded like it was mainly for IBS-C, not D (or possibly it was for C and A).I have D. It's something I am going to bring up with my doc. Makes sense to me since I get the bloating, gas, etc. Haven't been on AB for a LONG time. But I do remember some relief and a good "cleanout" a couple days after starting to take it.