What is a colon cleanse?

You don't need it: Your colon keeps itself clean naturally. If someone tells you that you may feel sick because of "toxic bowel settlement" or something similar and that you need a fancy laxative or bizarre enema, ignore that person. Please be careful. If you buy into the idea of needing to do weird things to "cleanse" yourself, you'll never feel well again. Find an evidence-based holist instead. Best wishes.