Frankly, the ones you buy in the store often have very few species in them. The advice I found (from a doctor) when I did my search was to get as many different species as you could and not worry about the colony forming units. That is how I ended up at Swanson Foods (online) to see what they had. The best at that time was Epic Pro with 25 species. A friend (also a MD) sent the individual research on the bugs and they all had good things to say about them. Fast foreward several years and Swansons' has a new one which I know nothing about so I stick with Epic Pro. Bare in mind- we are all snow flakes and the biome is one place we really differ. No two alike. Start slow and let your body judge.

Just bought it.. hope it works have gurd very very bad ... for hours of pain uper stomach.. berta hihanal hurna.. it's not cool..