I think it was the shot type: maybe 50 ml or so. I think it's a Swedish brand. I had the whole shot. Maybe that was too much. It's so tiring this whole thing with IBS, you just want it to work and yet everything you try has to be by tiny amounts so everything takes forever to try.
My fiancé has had some problems with probiotics too. He doesn't have IBS as far as we know, but his bowels act up every now and then too. He got better from probiotics for a few days then worse again so he stopped drinking it then too.