The average pancreas of an adult, I believe is loaded with rock hard stones and a fist full of worms. Dr. Christopher states that the herbs in the pancreas formula eventually cures the problems with the pancreas, so I theorize the herbs dissolve the satones and kills the worms, but it may take some time and be slow acting. The mop up can not dissolve the stones, so it may kill the worms but they still can't get out.