Kaolin clay is the kao which was once used in the over-the-counter medication "Kaopectate". I know that "Kaopectate" is not as good as it once was but did not know why until a doctor explained it to my wife. The doctor was a pain specialist and mentioned to her that she might want to get some kaolin clay to take as part of a regimen to counter the adverse effects of some of the medication she was taking. My wife was told that the FDA was urged by the Kaopectate company's competing pharmaceutical firms to pressure them into removing the kaolin clay from Kaopectate. The doc said that kaolin clay has healing and regenerative qualities and he takes 1/2 teaspoon mixed with juice daily as part of his own regimen. We do have some which we bought on line and use it on occasion. Has anyone else out there ever heard of it or tried it? BTW it comes in powder form.