Colonoscopy prep has been historically challenging with a very nasty liquid that clears the colon for good visualization of the surface. There is no natural cleanse that I know of that creates that squeaky clean they are needing to do an effective diagnostic scan. This is one of those times I recommend just doing it by the book. Western medicine is definitely at their best in diagnostics and this is not something we do that often. Take heart, they now have the peg 3350 product in capsule form, you can always request it if it is not offered.