Are there any good colon cleansers available?

Colon cleanse: The colon does not require "cleansing." The process of having a bowel movement takes care of that nicely. There is no buildup of toxins or other materials in the colon. Just eat a lot of fiber, drink plenty of liquids, and if constipated, consider an actual fiber supplement. See your gastroenterologist at age 50, or sooner if you're having problems. Those are the keys to good colon health.