We've been using Evivo for about 2 weeks now, so it may be a little soon to tell how things are going, but just anecdotally, our little guy seems to be doing better. Still grunting and squirming around as he passes gas, but seems to be much less of an issue. More comfortable appearing. This is, of course, the brilliance behind a product that claims to provide many health benefits but there's no concrete way of testing (nobody has the means to culture the stool to determine the predominant strain of bacteria). It's pricey for what it is, so I'm just hoping that there are long lasting benefits to this product!