Like many other products, I think VSL helps the smell if you have a problem with flatulence. As a test at home, I fart on purpose as a kind of test and notice only mild to no odor. But I still have the leaky kind of gas odor, and it's not much different at all, even taking VSL 2X/ day. The odor might not be as strong as before but its still there and still recognizable as gas. I don't know how these supplements improve the odor to farts, which is not my problem, but the leaky gas is hardly improved at all. What is the source? I'm still guessing that the odor emanates somewhere in the small bowel and as long as Any bacteria is present in the small bowel, it causes the odor. If my problem were farting, the smell is almost nil. Anyway, I don't think VSL is a big help, at least for me, but I bought 6 boxes so I'll keep taking, but probably won't reorder. $150.00 is too expensive for so little improvement.