I've worked with dialysis patients for years and bentonite clay has come up many times. It destroys your kidneys over a few years. The clay sticks to the inside of your nephrons. As the kidney disease advances (slowly) the nephrologist will ask you to allow them to perform a kidney biopsy, it is at this time that it is discovered that clay, acual clay, is stuck inside the millions of tiny nephrons in each kidney. Although you may see positive results, kidney disease, and evenually dialysis, is the end result.