What Does the Science Say About Closed-System Colonics?
If you are sceptical, welcome. The research base for modern closed-system colon hydrotherapy is still developing—but it is not empty. Here we bring together the direct research, relevant bowel-irrigation studies, thousands of years of historical context and more than two decades of Bottoms Up clinical experience, with each form of evidence clearly identified.
Begin with the question you actually have
This page brings together the articles we have written for clients, sceptical readers and health professionals. Each one examines a different question, explains the study behind it and states clearly what the research cannot prove.
What a New Scientific Review Says About Colon Hydrotherapy
Our foundational article examines the 2026 peer-reviewed review of transanal irrigation and colon hydrotherapy in chronic constipation. It explains why the review is noteworthy while keeping its narrative design, proposed “bio-integrated medicine” framework and need for stronger clinical trials in view.
Why start here? It gives you the broad research landscape before you move into the individual human studies below.
Read the scientific review article →Why Is Colon Hydrotherapy Research So Limited?
Why are there fewer trials than people expect—and what do funding, regulation, patents and academic infrastructure have to do with it?
What Happened When Colon Hydrotherapy Was Put to the Test?
A 2026 randomised controlled trial compared practitioner-operated hydrotherapy with another two litres of PEG after routine colonoscopy preparation had failed.
Does Bowel Irrigation Wash Away Good Gut Bacteria?
A 2021 study followed 11 children and adolescents with spina bifida using transanal irrigation every second day for three months.
What Happens to the Gut Microbiome When We Irrigate the Colon?
A 2022 human study followed 12 women with multiple sclerosis and neurogenic bowel dysfunction through four weeks of regular transanal irrigation.
What Happens When People Irrigate Their Bowel for Up to Two Years?
A 2026 multicentre Italian study enrolled 216 adults with functional constipation; 175 were prescribed transanal irrigation.
Is Colon Hydrotherapy Safe? Why Training and Screening Matter
Suzy responds to broad safety criticism by examining recognised risks, contraindications, practitioner competence and the role of referral.
The research base is still developing—but what we already know matters
Modern professional colon hydrotherapy has not been studied as extensively as many medical treatments. That is an important limitation, but it is not the same as saying that no evidence exists.
Recent research includes a 2026 randomised controlled trial of practitioner-operated colon hydrotherapy in a specific hospital setting, along with a growing body of related research on transanal irrigation. Across selected clinical populations, studies have reported encouraging findings involving bowel emptying, constipation-related quality of life, bowel preparation and microbial composition.
These studies do not prove every claim ever made about colonics, and related irrigation research is not a direct trial of the complete Rojas Technique. They do, however, give us meaningful findings, better questions and a stronger foundation for future treatment-specific research.
“Colonics” is not one single procedure
Enemas, open colonics, gravity-fed systems, medical lavage, transanal irrigation and professional closed-system colon hydrotherapy may all involve water and bowel emptying, but they are not interchangeable. The equipment, purpose, water delivery, practitioner involvement and treatment setting can be very different.
Enema
A smaller-volume introduction of fluid, generally intended to act mainly in the rectum and lower bowel. It may be self-administered or given in a care setting.
Colema board
A home-style gravity method using a board and fluid container. It is generally self-managed and is not the practitioner-operated treatment delivered by Bottoms Up.
Open-system colonic
The client usually inserts a small rectal nozzle and releases into an open basin. Practitioner involvement and equipment design differ from a closed-system session.
Gravity-fed irrigation
Water is delivered from an elevated reservoir using gravity. The exact format, flow controls, equipment and level of supervision depend on the system used.
Closed-system Rojas Colon Hydrotherapy®
The method used at Bottoms Up Colonics. A trained and certified therapist remains with the client, using professional closed-system equipment and a slow, gentle fill-and-release technique. The practitioner monitors water flow, temperature and the client’s comfort and response throughout the treatment.
The Bottoms Up approachMedical colon lavage
A clinical bowel-cleansing procedure performed for a defined medical purpose, using protocols and equipment determined by the treating medical service.
Transanal irrigation
A medical bowel-management therapy using a purpose-made device, commonly self-administered after clinical instruction. It provides relevant adjacent research, but it is not Rojas Colon Hydrotherapy®.
What the study posts show as a whole
Our articles label research as direct when it tested practitioner-operated colon hydrotherapy and related when it tested transanal irrigation. Neither label tells you whether a result was positive; it tells you how closely the intervention matches the question.
How the evidence has developed
This timeline shows the major publications discussed here. It represents chronology—not a score of study quality.
Colon hydrotherapy after inadequate colonoscopy preparation
Adults whose standard PEG bowel preparation had not cleaned the bowel adequately were randomised to same-day practitioner-operated colon hydrotherapy or another two litres of PEG. The hydrotherapy group had a higher median bowel-cleanliness score and more participants achieved “excellent” preparation.
Long-term irrigation for functional constipation
Across 13 Italian gastroenterology centres, 175 adults were prescribed transanal irrigation. Satisfaction, constipation severity, symptom count and bowel-related quality of life improved during follow-up of up to 24 months. No serious adverse events were reported.
Four weeks of irrigation and the gut microbiome
After alternate-day transanal irrigation, two measures of within-sample microbial diversity increased. The microbiome’s overall community structure did not shift significantly, while several bowel-function and bowel-related quality-of-life scores improved.
Three months of irrigation in children with spina bifida
After transanal irrigation every second day, researchers found microbial-composition changes rather than simple depletion. Relative abundance of Roseburia and Bacteroides increased, while measured bowel-function outcomes improved.
Where does the broader review literature sit?
A 2009 systematic review concluded that evidence was insufficient to recommend colonic cleansing for general health promotion. A 2026 narrative review discussed both transanal irrigation and colon hydrotherapy as areas with possible clinical utility, particularly in constipation, while also calling for standardised protocols and stronger research. These reviews ask different questions and use different bodies of evidence. Neither validates every form of “colon cleansing”, and neither directly evaluates the Rojas protocol.
Why has bowel irrigation kept returning for thousands of years?
Forms of bowel irrigation appear in documented medical history across very different eras. The equipment, explanations and standards have changed enormously, so these practices should not be treated as identical to modern closed-system colon hydrotherapy. What the historical record does show is a persistent human interest in bowel health and water-assisted evacuation.
Ancient Egypt
Historical and archaeological accounts describe enemas used for medical purposes in ancient Egypt, sometimes with water and other preparations. Later Egyptian medical texts show sustained attention to gastrointestinal and rectal health.
Classical Greece
Hippocratic medicine placed diet, digestion and bowel function within a broader view of health. Its explanations belong to the medicine of the period, but its attention to digestive wellbeing proved enduring.
Roman medicine
Roman-era physicians, including Galen, wrote about bowel habits and the therapeutic use of enemas. These practices reflected the medical theories and tools available at the time.
The Middle Ages
Enemas remained part of European and Middle Eastern medical practice, alongside local traditions and herbal preparations intended to support bowel evacuation.
The Enlightenment
European interest in anatomy, physiology and more systematic approaches to health reshaped how clinicians understood digestion and bowel care.
Equipment evolves
Medical instruments for enemas and bowel cleansing became more sophisticated and more widely used within clinical practice. This period helped lay the mechanical foundations for later irrigation systems.
Colonics enter wellness culture
Colonics became more visible within alternative-health and wellness movements. At the same time, medical debate about proposed benefits, mechanisms and risks intensified.
Renewed public awareness
Growing interest in self-care, natural health and detoxification brought bowel-cleansing products and services to a wider public audience.
More clinics, more scrutiny
Colon hydrotherapy became more widely available through clinics and wellness centres. Its increasing visibility also brought continued criticism, professional debate and calls for stronger safety standards and research.
Bottoms Up begins
Suzy Wilson began Bottoms Up Colonics in a small community north of Mackay, on a 55-acre property, while exploring supportive approaches to her own health and wellbeing.
Learning with Luis Rojas
Suzy travelled to the United States to spend time with Luis Rojas and explore a different approach to closed-system colonics: cooler water, comfortable holding and careful attention to the nervous system.
Experience keeps evolving
After cancer became part of Suzy’s own health story, recovery created a new pathway for sharing her work. Bottoms Up continues to develop its training, screening and practitioner-supported Rojas approach as new knowledge emerges.
Let’s face it: if a therapy involving a tube in your bottom offered no perceived value at all, it is difficult to imagine people returning to versions of it across so many eras.
Keeping the distinction clear: longevity is not clinical proof, and ancient practices are not the Rojas Technique. History belongs beside—not in place of—modern research. Explore the documented history of bowel care →
More than two decades of real-world experience
Bottoms Up Colonics was established more than 20 years ago. Since then, our clinics have helped tens of thousands of people and performed hundreds of thousands of treatments, giving our practitioners an extensive body of real-world experience working with people and their bowel health.
We have heard clients describe meaningful changes in how they feel, their bowel habits, their comfort and their relationship with their body. We have seen people arrive nervous or defeated and leave feeling heard, supported and hopeful.
These experiences are not clinical trials, and we do not present them as proof of cause and effect. But neither do we believe that decades of practitioner observation, tens of thousands of people helped and hundreds of thousands of treatments should be invisible simply because treatment-specific research is still catching up.
More than “cleaning out”
Suzy describes Rojas Colon Hydrotherapy® through the wider idea of cellular hydration and whole-person wellbeing. Her clinical framework considers five interconnected areas rather than viewing the bowel in isolation.
care Nervous Microbial Emotional
Read 100 Reasons Why
Published studies answer one kind of question. Client stories answer another: what did the experience mean to the person who lived it?
100 Reasons Why brings together real-life stories and practitioner case studies shared across the Bottoms Up Colonics community. These accounts are anecdotal and should not be read as clinical proof or a promise that another person will experience the same result. They are included because informed decisions can make room for both published research and the human experiences that help shape future research questions.
Read your free e-book Free PDF · 64 pages · Opens in a new tabSafety is built into every treatment
At Bottoms Up Colonics, client safety and comfort are at the centre of how we practise.
Our approach to colon hydrotherapy has been developed over more than two decades of clinical experience and hundreds of thousands of treatments. Every session is performed by a trained and certified therapist using professional closed-system equipment and the Rojas Technique®—a slow, gentle, practitioner-led approach focused on working with the body rather than forcing it.
Before treatment, we take the time to understand your health history, identify any contraindications and determine whether colon hydrotherapy is appropriate for you. Your therapist remains with you throughout the session, continuously monitoring your comfort and response and adjusting the treatment when needed.
As with any procedure involving the rectum or bowel, colon hydrotherapy is not completely without risk. Temporary effects such as cramping, fullness, bloating, nausea, dizziness or soreness can occur, and extremely rare complications have been reported in the medical literature.
We believe this is important context. How colon hydrotherapy is performed matters. Appropriate screening, professional equipment, practitioner training, gentle technique, hygiene protocols and continuous therapist supervision all form part of our approach to client safety.
Our approach to your safety
What you may experience
Temporary sensations
Some people may temporarily experience fullness, cramping, bloating, nausea, dizziness or rectal soreness. If anything during your treatment does not feel right, your therapist is there with you and can modify or stop the treatment.
Rare but important risks
More serious complications associated with bowel irrigation have been reported in external medical literature and are considered extremely uncommon. The precise incidence for professional colon hydrotherapy is not well established, which is why screening, technique and supervision matter.
Colon hydrotherapy is not appropriate for everyone. Seek medical advice for persistent or concerning bowel symptoms, and discuss relevant health conditions with your practitioner before treatment.
Read our detailed safety positionDEBUNKING THE MYTHS
There’s no shortage of opinions about colon hydrotherapy online. So, let’s separate some of the most common myths from what we actually know.
An important distinction: when we talk about colon hydrotherapy at Bottoms Up Colonics, we are talking specifically about professional closed-system colon hydrotherapy using the Rojas Technique®, performed by a trained and certified practitioner following appropriate screening, hygiene and treatment protocols.
That matters. Not every type of bowel irrigation is the same, and not every treatment called a “colonic” is performed using the same equipment, technique, practitioner involvement or safety protocols.
“Your bowel becomes dependent on colonics.”
This is one of the most common concerns we hear.
There is no good evidence establishing that appropriately performed colon hydrotherapy causes a healthy bowel to “forget” how to function or become physiologically dependent on colonics.
In fact, related medical bowel-management techniques, such as transanal irrigation, are used repeatedly in selected patients, including as part of long-term bowel-management programs.
However, this does not mean colon hydrotherapy should replace appropriate investigation of persistent constipation or changes in bowel function. If someone feels they cannot have a bowel movement without ongoing intervention, that deserves further investigation—and this is an important part of the care we provide at Bottoms Up Colonics.
Our trained and certified therapists look beyond the treatment itself. We encourage clients to explore the factors contributing to their symptoms and provide education and support to help them make informed, empowered choices about their bowel health and overall wellbeing.
Forms of bowel irrigation have been practised for thousands of years, and across more than two decades of clinical experience at Bottoms Up Colonics, working with tens of thousands of people, we have not observed evidence that professionally delivered colon hydrotherapy creates a “lazy bowel”. This is a practice observation rather than controlled clinical proof, and treatment-specific research is still needed.
“Colonics wash away all your good bacteria.”
Your gut microbiome is considerably more complex than a layer of bacteria sitting inside the colon waiting to be washed away.
Microorganisms exist within an intricate intestinal ecosystem, including communities associated with the mucus layer and intestinal lining. The human research examining bowel irrigation and the microbiome does not support the simplistic claim that irrigation simply strips the colon of all its beneficial bacteria.
Some small studies of transanal irrigation have observed changes in microbial composition and increases in microbial diversity—challenging the popular misconception that introducing water into the bowel automatically “washes away all the good bacteria”. Greater diversity does not automatically mean a healthier microbiome, and these studies did not examine the complete Rojas Technique®.
The evidence currently available does not support the claim that a colonic simply flushes out all beneficial bacteria. Nor does that claim reflect what we have observed clinically across more than 20 years of working directly with clients.
We believe people deserve more than fear-based claims or sweeping statements. They deserve context, evolving evidence and the information they need to make informed, empowered choices about their own health.
“Colonics can perforate your bowel.”
It is understandable that people may have concerns about perforation, particularly if they imagine colon hydrotherapy involves inserting tubing deep into the colon or forcing large amounts of water into the bowel.
That is not how a Rojas Colon Hydrotherapy® treatment is performed.
We are not winding tubes through the colon. We are not blasting water into the bowel. And we are not leaving clients unattended to perform the treatment themselves.
A small, single-use speculum is gently inserted into the rectum only. We use professional devices and tubing that meet applicable Australian requirements, and every treatment is performed and continuously monitored by a trained and certified therapist who pays close attention to water flow, pressure and, most importantly, the client’s comfort and response throughout the session.
Central to this is the Rojas Technique®—a slow and gentle fill-and-release method focused on flow, hydration and working with the body’s natural responses rather than force.
As with any procedure involving the rectum or bowel, perforation is a recognised potential complication, and rare cases associated with bowel cleansing and irrigation have been reported. It would therefore be misleading to suggest the risk does not exist. But it is equally important to put that risk into context.
According to Bottoms Up Colonics’ internal clinical records, no known incidence of bowel perforation has been recorded in association with a treatment performed in our clinics across more than 20 years and hundreds of thousands of treatments.
We do not share this to suggest that risk should be dismissed. We share it because how colon hydrotherapy is performed matters.
Appropriate client screening, contraindication protocols, professional equipment, practitioner training and technique all play an important role in safety. At Bottoms Up Colonics, clients are screened before treatment, contraindications are taken seriously, and our therapists are trained to recognise when a treatment may not be appropriate or when a session should be modified or stopped.
For more than two decades, our approach has remained grounded in the same principles: screen carefully, proceed slowly and gently, never force, continuously monitor, and put the client’s safety and comfort first.
“All colonics are the same.”
No, not all colonics are the same.
When it comes to colon hydrotherapy, context matters. The type of system, equipment, technique, training and experience of the therapist, appropriate client screening and the protocols surrounding treatment can all significantly shape the experience.
At Bottoms Up Colonics, when we talk about colon hydrotherapy, we are specifically referring to professional, closed-system colon hydrotherapy using the Rojas Technique®, performed by trained and certified therapists within established screening, hygiene and treatment protocols.
Our approach is slow, gentle and practitioner-led. The therapist remains with the client throughout treatment, carefully monitoring the flow of water, the client’s comfort and how their body is responding. The emphasis is on working with the body—never forcing it.
This distinction is particularly important when researching colon hydrotherapy online. The terms colonic, colon cleanse, enema, transanal irrigation and colon hydrotherapy are sometimes discussed as though they are interchangeable, when they can involve very different equipment, techniques, purposes and levels of practitioner involvement.
So when you read research, reviews or claims about “colonics”, one of the most important questions to ask is: what type of treatment are they actually talking about?
Because when it comes to colon hydrotherapy, how the treatment is performed matters.
References
- Acosta RD, Cash BD. Clinical effects of colonic cleansing for general health promotion: a systematic review. American Journal of Gastroenterology. 2009;104(11):2830–2836.
- Zhang D, et al. Efficacy and safety of remedial hydrotherapy enema for inadequate bowel preparation in colonoscopy: a prospective randomised controlled trial. European Journal of Medical Research. 2026;31:1059.
- Falletto E, Martellucci J, Rossitti P, et al. Transanal Irrigation in Functional Constipation: Long-term Results From an Italian National Study. Diseases of the Colon & Rectum. 2026;69(7):1901–1910.
- Ascanelli S, Bombardini C, Chimisso L, et al. Trans-anal irrigation in patients with multiple sclerosis: efficacy in treating disease-related bowel dysfunctions and impact on the gut microbiota. Multiple Sclerosis Journal—Experimental, Translational and Clinical. 2022;8(3).
- Furuta A, Suzuki Y, Takahashi R, et al. Effects of Transanal Irrigation on Gut Microbiota in Pediatric Patients with Spina Bifida. Journal of Clinical Medicine. 2021;10(2):224.
- Emmanuel A. Review of the efficacy and safety of transanal irrigation for neurogenic bowel dysfunction. Spinal Cord. 2010;48(9):664–673.
- Preziosi G, Gosling J, Raeburn A, Storrie J, Panicker J, Emmanuel A. Transanal irrigation for bowel symptoms in patients with multiple sclerosis. Diseases of the Colon & Rectum. 2012;55(10):1066–1073.
- Simillis C, et al. Usefulness of Transanal Irrigation and Colon Hydrotherapy in the Treatment of Chronic Constipation and Beyond. Gastrointestinal Disorders. 2026;8(1):6.
- Cleveland Clinic: Why You Should Avoid Colon Cleansing. Updated June 2025.
- Australian Government: National Bowel Cancer Screening Program.
- Fischer H. “Pharaoh’s proctologist: The Shepherd of the Rectum.” Hektoen International: A Journal of Medical Humanities. Summer 2023.
- Maksimović J, Maksimović M. “From history of proctology.” Archive of Oncology. 2013;21(1):28–33.
- Kellogg JH. “Should the Colon Be Sacrificed or May It Be Reformed?” JAMA. 1917;68(26):1957–1959.
Curious? Bring us your questions.
Speak with one of our trained practitioners, understand exactly what a professional closed-system Rojas Colon Hydrotherapy® treatment involves and explore whether it may be appropriate for you. You will be met with clear information, careful screening and no judgement or pressure.