I was using that brand & didn't have any problems with gas (at least not more than I ususally do!). I'm currently taking PB8 since it was recommended by someone here on the boards & the vitamin store told me it was more potent. The only problem I had with the Jarros was that it had to be refrigerated so I couldn't keep it in my bag. As a result, I kept forgetting to take it. I still don't know if the probiotics even do anything for me but I guess they can't hurt. good luck with them.