Not only does colon cleansing provide no benefit, it can be downright dangerous. Contrary to popular belief, the inside of the colon the end of the large intestine isn't dirty and does not need to be cleaned out. Mother Nature does that on her own by making sure that waste passes through and out of your body, taking impurities with it. Colon cleansing is a procedure that involves having an enema or using a laxative that completely evacuates the intestine. It has been touted as everything from a toxin remover to a cure for cancer.
Some spas even offer the treatment.
Use of enemas particularly scares me because it may involve unskilled personnel performing a procedure that could be harmful. The risk of damaging the rectum, and even perforating the bowel, is a real one. There is no medical reason whatsoever for having a cleansing enema. So if anyone other than your doctor suggests an enema, just say no. If you want to flush out impurities from your body, have another glass of water instead.