Bentonite is a volcanic ash and also referred to as 'clay' in some cleanses. Liquid Bentonite is the best to use internally. Bentonite is not absorbed into the body, but is known as an aDsorber that attracts toxins to it so that they are expelled from the body. It is particularly effective when taken with psyllium to remove mucoid plaque accumulations in the intestines. The structure of the bentonite particles gives it an amazing surface area. Do a search for Yerba Prima and click on their info about Great Plaines Detox liquid bentonite...it gives you all sorts of facts about bentonite.