Colonics have been hawked as everything from a toxin remover to a cancer cure. But they only do what your intestinal system does already. Enemas, laxatives, or passing a rubber tube through your rectum and pumping water in and out can be expensive and dangerous. “There’s no evidence that colon cleansing is necessary,” Siegel says. And experts say long-term cleansing can cause anemia, malnutrition, infection, intestinal damage, and even heart failure.

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