bentonite. i played with it and i liked it but i didnt want to clog up my drain with it and internally i didnt want to clog my bowels. i found the most important thing was to feed the good flora and fauna in your gut what they like. my body is teaming with life. life comes from life. good bugs will volunteer if the medium in which they must grow is suitable. this is what makes probiotics a scam, even though i enjoy a good kombucha and yogurt.