Colon Hydrotherapy (Colonics): What to Know Before You Book

Colon hydrotherapy, also called colonic irrigation or colonics, flushes the large intestine with water through a tube in the rectum. It’s sold at spas, wellness centers and naturopathic clinics, often in packages, with promises to remove toxins, ease bloating or help with weight loss.¹ Here is what federal health researchers say.

What the evidence shows

The National Center for Complementary and Integrative Health (NCCIH)¹, part of the National Institutes of Health, reviewed detoxes and cleanses, including colonics.¹

• Few studies exist, and most are low quality.¹
• There’s limited clinical evidence supporting colonic irrigation, and insufficient evidence for the uses it’s promoted for.¹
• A 2015 review found no compelling research that detox programs remove toxins or help with weight management.¹

Your liver, kidneys and gut already clear waste. The idea that a stored buildup of “toxins” in the colon needs to be washed out isn’t supported by this research.

Safety concerns

NCCIH says colon cleansing can have side effects, some of them serious.¹ It also notes that the FDA and FTC have taken action against companies whose colon-cleansing devices were marketed for unapproved uses.¹

Harm is more likely if you have:¹

• a history of digestive disease or colon surgery
• severe hemorrhoids
• kidney disease
• heart disease

Cleanse programs that add laxatives can cause diarrhea and dehydration, and long stretches of drinking only water or tea can upset your electrolytes.¹ Colon-cleansing products can cause problems too. One 2021 case report described inflammation of the colon with bloody diarrhea after a person used a cleansing product for constipation.² Our detox tea label check covers laxative teas.

If bloating or constipation is the reason

Ongoing bloating, constipation or a change in bowel habits deserves a look from a clinician, not a spa package. Proven options include fiber, fluids and over-the-counter laxatives. Our guides to psyllium fiber and choosing a laxative explain them. If you’re due for colon cancer screening, colonics don’t count. See our article on at-home colon cancer tests.

Questions to ask before you book

1. What exactly do you claim this will do, and what’s the evidence?
2. What training or license does the person running it have?
3. How is the equipment cleaned, and are tubes single-use?
4. Should I skip this because of my heart, kidney or bowel history?

Try: “I’ve been bloated for months and a spa recommended colonics. Should we check for a cause first, and is it safe for me?”

Bloated by Dinner includes a Belly Clock log and a Test-It list with a visit script. Use them to track symptoms and what you’ve tried, so your clinician can find the cause. See the book.