I've done the epsom cleanse (Dr. Clark's) six times since October. I chose this cleanse because it seemed the simplest and Dr. Clark speaks so confidently of it in her book: The Cure For All Diseases . There are no ill side effects, that I know of, from using the epsom as prescribed in the cleanse. It is recommended that you don't do them closer than at two week intervals, which is what I did for the first 5 cleanses. Then I waited 1 month between the 5th and 6th cleanse.
I had done a parasite/bowel/ kidney cleanse within about 6 months prior to doing the liver cleanse. Dr. Clark recommends you do them first. However, many on the gallstone group list ( you might like to join!) have done the liver cleanse without having done the other cleanses first, and have been fine too. Dr. Clark says that you will be more successful if you do them first, and that you might feel quite ill(queesy/nauseous) during the liver cleanse if you haven't done them first. That's all I know about it though.