I have used the Garden of Life cleanse a couple of times with virtually no discomfort. The products create a very natural and thorough elimination without cramping. The man who helped get the Garden of Life products on the shelf is Justin Rubin. He wrote the book called: The Maker's Diet. He had such a bad case of Crohn's disease, he almost died. At one time he weighed about 90 pounds. Now he's well and back to a healthy 180.