As for formula, wasn't aware there were different formulas, thought the psyllium/parasite/tea one was all they had. I will have to get back to the Colonix site when I have some free time (hardly ever) and look into it further. At any rate, I'm having such a terribly tough financial time right now that it will be a while before I can afford to shell out a measly $70, even on something so important as my health. Keep me posted on what it does to you. It is always better to hear these things from a real person than just through testamonials that you're never quite sure are all real, know what I mean? :)