The toxins that come out of the liver and gallbladder from a Liver Flush procedure can be so toxic, that you really need to be able to defacate fully without obstruction and not have lots of feces blocking your bowel. Some people literally cannot shit they are so blocked up. This is why a Bowel Cleanse is suggested before attempting liver flushing. Its all here on the site, the order in which to do cleanses.