This is what Anthony William says about apples from his "Liver Rescue" book.
But an interesting experiment might be to stop eating apples, and only take pectin as a separate supplement, and see if there continues to be benefits that have been noted from eating just apples. Might pinpoint just how much of a factor the pectin is. -- Almond butter on 1-2 large apples (usually Fuji) is one of my daily staples.