Colon Cleanse: The Complete Guide

What is a colon cleanse?

A colon cleanse is any method meant to flush stool and supposed “toxins” out of the large intestine, usually with laxative pills or teas, an enema, water pumped through the rectum (colonic hydrotherapy) or a juice “detox” program. Doctors use bowel cleansing before a colonoscopy, but Mayo Clinic says there is no evidence that cleansing removes toxins or improves general health.

That gap between the marketing and the medicine is the whole story of colon cleansing. This guide covers what each type involves, what the research shows, the documented risks, and what supports regular bowel movements instead. It is general information, not medical advice.

The main types of colon cleanse

“Colon cleanse” is a marketing label, not a medical term. It covers several very different practices, and the risks differ between them.

Oral laxative and herbal kits

These are capsules, powders or teas taken by mouth, often sold as a 7-day or 14-day “cleanse.” Many contain stimulant or osmotic laxatives, fiber, or herbs such as senna. The National Center for Complementary and Integrative Health (NCCIH) notes that detox programs may include laxatives, which can cause diarrhea, and that acute diarrhea can lead to dehydration.

Enemas

An enema puts a small amount of liquid into the rectum, which is held briefly and then expelled. Mayo Clinic notes that medical cleanses use water, while detox versions sometimes use herbal solutions, coffee or coffee grounds.

Colonic hydrotherapy (colonics)

A colonic, also called colonic irrigation, sends a large volume of water through a tube in the rectum to flush the colon, usually at a spa or wellness clinic. Cleveland Clinic points out that the “colonic hygienists” who perform it are typically not medical doctors.

Juice and “detox” programs

These programs replace meals with juices, teas or shakes for a few days, sometimes paired with supplements. They are sold as a way to “reset” or clean out the gut. NCCIH groups them with other detox and cleanse programs and notes that unpasteurized juices can make people sick.

The “toxin buildup” idea vs how your body works

Most cleanse marketing rests on one idea: waste sticks to the colon wall, rots, and releases toxins that cause fatigue, headaches, bloating or weight gain. Cleveland Clinic says there is no scientific evidence for the theory that the body poisons itself this way. Mayo Clinic adds that research does not show that toxins build up in the body from a normal diet or activity.

The digestive system already has a cleanup process. According to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), the large intestine absorbs water and turns liquid waste into stool, and its bacteria help break down remaining nutrients and make vitamin K. Stool then leaves the body on its own schedule.

The liver does most of what people imagine a cleanse does. Cleveland Clinic describes filtering harmful substances and waste from the blood as the liver’s biggest job, breaking down toxins so they leave the body in urine and stool. Flushing the colon from below does not speed up that work.

Cleansing can also interfere with normal colon function. Cleveland Clinic notes that the colon absorbs water and stores stool, and disrupting either job can upset the body’s fluid balance.

Do colon cleanses work? What the research shows

The short answer is that there is no good evidence that colon cleansing improves general health, removes toxins, or prevents disease. The research that exists is thin, and most of it describes harms rather than benefits.

Systematic reviews

A 2009 systematic review in the American Journal of Gastroenterology searched both mainstream and alternative medicine literature. The authors found no methodologically rigorous controlled trials supporting colon cleansing for general health, but multiple case reports and case series of adverse effects. They concluded the practice “cannot be recommended.”

A 2011 review in The Journal of Family Practice by Georgetown University physicians reached the same conclusion. It found no scientifically robust studies supporting cleansing, and it listed reported harms ranging from cramping and vomiting to electrolyte imbalance, kidney failure and rectal perforation.

Detox diets and weight

NCCIH summarizes two reviews. A 2015 review found no compelling research to support detox diets for weight management. A 2017 review found that juice and detox diets cause early weight loss because people eat so few calories, but the weight often comes back once normal eating resumes. No long-term studies exist.

One small 2017 UCLA study put 20 healthy adults on a juice-only diet for 3 days, followed by 14 days of their usual diet. Weight dropped and gut bacteria shifted, and the bacterial changes were partly reversed by day 17. The study was small and short and did not measure any “toxin” removal.

Colonic irrigation trials

Controlled trials of colonics for general health are essentially absent. The closest is a 2016 pilot study from Taiwan in 18 people with irritable bowel syndrome, using a self-administered irrigation device twice a day, six days a week, for 1 to 4 weeks. Pain and bowel habits improved, but there was no sham or placebo group, and the authors said larger studies, including on placebo effects, are needed. It was a test of a treatment for a diagnosed condition, not a detox.

Coffee enemas

A 2020 systematic review of self-administered coffee enemas found nine case reports of harm, seven of them describing colitis (inflamed colon), and no study showing the practice works. Mayo Clinic states that coffee enemas have been linked to many deaths.

What cleansing does to gut bacteria

A 2015 study in Gut gave 23 healthy volunteers a standard colonoscopy bowel prep. Their total gut bacteria dropped about 31-fold right after the cleanse, and the bacterial communities had mostly recovered within 14 days. A medical prep is worth that disruption when a doctor needs to see the colon. As a routine wellness habit, flushing the colon may set back the gut bacteria people are trying to support.

Colon cleanse claims: evidence at a glance

Claim	Evidence strength	Source
Cleansing removes built-up toxins	None. No evidence toxins accumulate from a normal diet	Mayo Clinic; Cleveland Clinic
Cleansing improves general health or energy	None. No rigorous controlled trials	Acosta and Cash, 2009
Juice or detox cleanses cause lasting weight loss	Weak. Early loss from low calories, often regained	NCCIH
Colonics ease IBS symptoms	Very limited. One uncontrolled pilot study in 18 people	Hsu et al., 2016
Coffee enemas help health	None. Only case reports of harm	Son et al., 2020
Bowel prep empties the colon before a colonoscopy	Strong. Standard medical use under supervision	NIDDK
Fiber, fluids and activity support regular bowel movements	Good. Recommended by NIDDK	NIDDK
Cleansing can cause serious harm	Documented in case reports and FDA safety warnings	Mishori et al., 2011; FDA

Colon cleanse side effects and risks

Most people who try a cleanse get through it with nothing worse than cramps. But the risks are real, and they are higher for some people. Mayo Clinic lists common side effects as cramping, bloating, diarrhea, upset stomach and vomiting.

Dehydration and electrolyte problems

Mayo Clinic lists dehydration and electrolyte imbalance among the risks, and notes that electrolyte imbalance is especially dangerous for people with kidney or heart disease. NCCIH warns that drinking large amounts of water or herbal tea while avoiding food for days could lead to dangerous electrolyte imbalances.

Kidney injury

In 2014 the FDA warned that taking more than the labeled dose of over-the-counter sodium phosphate laxatives can cause severe dehydration and shifts in blood electrolytes that can seriously harm the kidneys and heart, and in some cases has been fatal. Most serious cases involved a single dose larger than the label allows, or more than one dose in a day. A 2011 case report describes a 64-year-old woman who developed acute kidney injury, ending in stage 4 chronic kidney disease, after drinking a sodium phosphate solution to prepare for a colonoscopy.

Bowel perforation

Mayo Clinic lists rectal perforation from the tube as a risk of colonics and enemas. Cleveland Clinic says colon perforation is rare but possible, with a higher risk when the procedure is done by untrained people.

Infection

Shared equipment can spread infection. In a well-documented outbreak reported in the New England Journal of Medicine, at least 36 people who had colonic irrigation at one clinic in western Colorado between 1978 and 1980 developed amebiasis, a parasitic infection, and 10 needed part of the colon removed. Testing found the machine heavily contaminated with fecal bacteria after routine cleaning. Mayo Clinic advises that colon cleansing equipment should be used once and thrown out.

Herbal additives and hidden ingredients

Cleveland Clinic notes that some herbal preparations used in cleanses have been linked to aplastic anemia (a failure of the bone marrow) and liver toxicity. NCCIH says the FDA and FTC have acted against detox products that contained hidden ingredients or made false disease claims.

One example: in 2019 the FDA sent a warning letter about “Golean Detox,” sold as a dietary supplement with a label claiming it would clear excess waste and move toxins through the digestive system. FDA testing found undeclared sibutramine and phenolphthalein, and the agency said the product was dangerous to health when used as labeled.

Drug interactions

Cleanses can change how your body handles medicines and fluids. The FDA sodium phosphate warning says the risk of harm is higher in people taking diuretics, ACE inhibitors, angiotensin receptor blockers (ARBs) or NSAIDs. Mayo Clinic advises checking with your main healthcare professional before any cleanse, especially if you take medicines.

Who should be most careful

Between them, NCCIH and Cleveland Clinic say the risk of harm is higher for people with:

• Digestive disease such as Crohn’s disease, ulcerative colitis or diverticulitis
• Previous colon surgery
• Severe hemorrhoids
• Kidney disease, including people on dialysis
• Heart disease or heart failure

Cleveland Clinic adds that a cleanse can mask the cause of constipation. Constipation can come from conditions such as an underactive thyroid, which a cleanse will not address.

What the FDA says about colonic machines

Under federal rules (21 CFR 876.5220), a colonic irrigation system is a Class II device only when it is used for medically indicated cleansing, such as before an X-ray or endoscopic exam. Any other use, including routine colon cleansing for general well-being, puts it in Class III, which requires FDA premarket approval before it can be sold for that purpose.

FDA’s device database lists a separate product code for “colonic irrigation system, general well being”, and its product page shows no premarket approvals under that code. In practical terms, no colonic machine has FDA approval for general wellness or “detox” use. The 2011 Journal of Family Practice review reached the same conclusion, noting that the FDA had never approved any system for general nonmedical purposes.

That does not mean every spa machine is illegal. A device cleared for medical bowel cleansing can still be used in a wellness setting. It does mean that wellness claims for colonics have not gone through FDA review.

The legitimate use: bowel prep before a colonoscopy

There is one situation where clearing out the colon is the right call: preparing for a colonoscopy or certain other procedures. According to NIDDK, stool inside the large intestine can keep the doctor from clearly seeing its lining, so you need a complete bowel prep that leaves you passing clear, liquid stool.

This is done under medical supervision. A health care professional gives you written instructions, you may follow a clear-liquid diet for a day or more, and the prep uses a specific combination of laxative pills, liquids or powders. A doctor then performs the colonoscopy in a hospital or outpatient center.

Even medical preps carry risk, which is why the dose and timing are chosen for each person. The kidney-injury case above happened during a supervised colonoscopy prep, and the FDA warning applies to the same type of laxative. Follow the instructions you are given and do not add your own cleanse on top.

Colorectal cancer screening: the real way to check colon health

Many people try a cleanse because they are worried about their colon. If that worry is cancer, a cleanse does nothing to find or prevent it. Screening does.

The U.S. Preventive Services Task Force recommends colorectal cancer screening for all adults aged 50 to 75 and for adults aged 45 to 49. For people 76 to 85, the decision is made case by case. Recommended options include:

• A stool test (FIT or high-sensitivity guaiac test) every year
• A stool DNA-FIT test every 1 to 3 years
• CT colonography every 5 years
• Flexible sigmoidoscopy every 5 years, or every 10 years with a yearly FIT
• Colonoscopy every 10 years

These are different from the gut microbiome kits sold for wellness, which are not on the Task Force list. Our guide to gut health tests explains what those kits can and cannot tell you. If you have a family history of colorectal cancer, ask your doctor whether you should start screening earlier.

A natural colon cleanse that actually works: regular bowel movements

If the goal is to feel lighter and less bloated, the colon already clears itself when it gets what it needs. The “natural colon cleanse” with the best support is the everyday advice from NIDDK for keeping bowel movements regular.

Eat more fiber, gradually

NIDDK says adults should get 22 to 34 grams of fiber a day, depending on age and sex, from foods such as whole grains, oatmeal, beans, fruits, vegetables and nuts. Mayo Clinic explains that fiber increases the weight and size of stool and softens it, and advises adding it slowly over a few weeks to limit gas and bloating.

Some specific foods have trial data. In a 4-week randomized trial in 120 healthy adults with low fiber intake, eating 80 to 120 grams of prunes a day increased stool weight and frequency compared with water alone, though it also increased gas. A smaller US trial in 79 adults with chronic constipation found that two green kiwifruit a day, prunes, and psyllium fiber all increased bowel movements over 4 weeks, with kiwifruit causing the fewest side effects.

Food is the first choice. Mayo Clinic notes that whole foods are generally better than fiber supplements, though a supplement can help when diet changes are not enough. A 2023 AGA-ACG guideline on chronic constipation made a conditional recommendation for fiber. See our fiber supplement guide and our list of the best foods for gut health for practical options.

Drink enough fluids

Fiber works best when it absorbs water. NIDDK advises drinking plenty of water and other liquids, especially when you add fiber, and asking a health care professional how much is right for you.

Move and keep good bathroom habits

NIDDK says regular physical activity may help relieve constipation. It also suggests going as soon as you feel the urge, giving yourself enough time, and trying a set time each day. After breakfast often works because eating stimulates the colon.

Consider fermented foods

Fermented foods are not a cleanse, but they may support a varied gut microbiome. In a 17-week Stanford study with 18 people per group, a diet high in fermented foods such as yogurt, kefir and kimchi increased gut microbiome diversity and lowered some inflammatory markers. It was small and did not test constipation. Our guide to fermented foods for gut health covers the options, and the gut health diet plan puts the pieces together into a week of meals.

Use laxatives only as directed

NIDDK says a health care professional may recommend a laxative for a short time, and that stimulant laxatives are for severe constipation or when other treatments have not worked. If you have relied on laxatives for a long time, ask your doctor how to taper off gradually.

If you still want to try a cleanse

Some people will try one anyway. If you do, Mayo Clinic suggests a few steps to lower the risk:

• Talk with your main healthcare professional first, especially if you take medicines or have a health condition.
• Ask for a full list of ingredients and amounts in any herbal product.
• Choose an experienced practitioner and check their training, licensing and certifications.
• Make sure the equipment is single-use and thrown out after each session.

When to see a doctor

Bowel changes that last or come with other symptoms need a medical check, not a cleanse. NIDDK advises getting care right away if constipation comes with any of these:

• Bleeding from the rectum or blood in the stool
• Constant pain in the abdomen
• Being unable to pass gas
• Vomiting
• Fever
• Lower back pain
• Losing weight without trying

The NHS also lists changes in bowel habits that are unusual for you, a persistent urge to go even after using the toilet, a lump in the tummy, and tiredness or breathlessness as possible signs of bowel cancer that should be checked. These symptoms often have other causes, but they still need to be seen. See a doctor too if constipation does not improve with self-care, or if you have a family history of colorectal cancer.

This article is general information and is not medical advice. Talk with a health care professional about your own symptoms before starting any cleanse, laxative or supplement.

Frequently asked questions

Related topics

• Best Foods for Gut Health: the fiber-rich and fermented foods worth eating most often.
• Fiber Supplement: how psyllium, inulin and other fibers compare.
• Gut Health Diet Plan: a practical week of meals built around fiber and fermented foods.
• Fermented Foods for Gut Health: what the research says about yogurt, kefir, kimchi and more.
• Gut Health Test: what at-home microbiome kits measure and their limits.
• Worst Foods for Gut Health: low-fiber habits that make constipation more likely.

Sources

• “Detoxes” and “Cleanses”: What You Need To Know (National Center for Complementary and Integrative Health)
• Colon cleansing: Is it helpful or harmful? (Mayo Clinic, 2024)
• Why You Should Avoid Colon Cleansing (Cleveland Clinic)
• Your Digestive System & How It Works (National Institute of Diabetes and Digestive and Kidney Diseases)
• Liver: Function and Anatomy (Cleveland Clinic)
• 21 CFR 876.5220, Colonic irrigation system (Code of Federal Regulations, via Legal Information Institute, Cornell Law School)
• Product Classification: Colonic irrigation system, general well being (U.S. Food and Drug Administration)
• Total Product Life Cycle: Colonic irrigation system, general well being (U.S. Food and Drug Administration)
• FDA Drug Safety Communication: Possible harm from exceeding recommended dose of over-the-counter sodium phosphate products to treat constipation (U.S. Food and Drug Administration, 2014)
• Warning Letter: GoLean Detox US (U.S. Food and Drug Administration, 2019)
• Colonoscopy (National Institute of Diabetes and Digestive and Kidney Diseases)
• Colorectal Cancer: Screening (U.S. Preventive Services Task Force, 2021)
• Treatment for Constipation (National Institute of Diabetes and Digestive and Kidney Diseases)
• Eating, Diet, & Nutrition for Constipation (National Institute of Diabetes and Digestive and Kidney Diseases)
• Symptoms & Causes of Constipation (National Institute of Diabetes and Digestive and Kidney Diseases)
• Dietary fiber: Essential for a healthy diet (Mayo Clinic)
• Symptoms of bowel cancer (NHS)
• Acosta RD, Cash BD. Clinical effects of colonic cleansing for general health promotion: a systematic review (American Journal of Gastroenterology, 2009)
• Mishori R, et al. The dangers of colon cleansing (Journal of Family Practice, 2011)
• Istre GR, et al. An outbreak of amebiasis spread by colonic irrigation at a chiropractic clinic (New England Journal of Medicine, 1982)
• Hsu HH, et al. Treatment of irritable bowel syndrome with a novel colonic irrigation system: a pilot study (Techniques in Coloproctology, 2016)
• Henning SM, et al. Health benefit of vegetable/fruit juice-based diet: role of microbiome (Scientific Reports, 2017)
• Son H, et al. The safety and effectiveness of self-administered coffee enema: a systematic review of case reports (Medicine, 2020)
• Jalanka J, et al. Effects of bowel cleansing on the intestinal microbiota (Gut, 2015)
• Jacobs W, et al. Acute kidney injury after use of oral Fleet Phospho Soda as bowel preparation for colonoscopy (Acta Gastro-Enterologica Belgica, 2011)
• Lever E, et al. The effect of prunes on stool output, gut transit time and gastrointestinal microbiota: a randomised controlled trial (Clinical Nutrition, 2019)
• Chey SW, et al. Exploratory comparative effectiveness trial of green kiwifruit, psyllium, or prunes in US patients with chronic constipation (American Journal of Gastroenterology, 2021)
• Chang L, et al. AGA-ACG clinical practice guideline: pharmacological management of chronic idiopathic constipation (American Journal of Gastroenterology, 2023)
• Wastyk HC, et al. Gut-microbiota-targeted diets modulate human immune status (Cell, 2021)

This article is for general information and is not medical advice. Talk to your doctor or a registered dietitian before changing your diet, supplements or medication, especially if you have a health condition.