Colonic, the cleansing procedure supposed to detoxify colon and rectum, is an enema. There is no scientific support for colonics. Colon naturally reabsorb water, sodium, potassium, and vitamins produced by bacteria, carry waste out of the body, prevents toxic material from entering the body, and is home for a large population of vitamin producing bacteria. Colonics could alter the balance of bacteria. More and more studies show the importance of colonic bacteria in the health of the entire body. Good nutrition and exercise keep the body healthy.