If you are wondering whether colonic irrigation is safe, you are asking exactly the right question before booking. It is the question I hear most often from new clients — and it deserves a thorough, honest answer.
I am Marijke Vogel, an ARCH-accredited colon hydrotherapist and naturopath with over 25 years of clinical experience at Phenomenal Colonics in Belsize Park, North London. In this article I will walk you through what the evidence says, who colonic irrigation is suitable for, who should avoid it, and what to look for in a therapist.
What Is Colonic Irrigation and How Does It Work?
Colonic irrigation — also known as colon hydrotherapy — uses warm, filtered water introduced gently into the colon to soften and loosen waste material, which then flows out through a tube. A session typically lasts 45 to 60 minutes.
What many people do not realise is that there are different methods of delivery, and they are not all the same.
Closed or pressure systems use larger volumes of water delivered electronically. Your therapist supervises the session and controls the pressure throughout.
Open systems — sometimes called the Angel of Water or Libbe system — are self-administered. The client sits on a basin-style unit and the therapist is not always present in the room.
The method I use is manual, gravity-controlled colon hydrotherapy. Water flows slowly and gently in and out, particularly at the start of the session when we are focused on releasing gas. Working this way allows us to move calmly around the large intestine without causing discomfort or cramping. I am present and attentive throughout — adjusting the flow, checking your comfort, and guiding the session as it progresses. I find it the most responsive and client-centred approach.
Is Colonic Irrigation Safe? What the Evidence Shows
For most healthy adults, colonic irrigation performed by a qualified practitioner carries a low risk of serious adverse effects. The key phrase is qualified practitioner — the safety of the procedure is directly tied to the competence of the person performing it.
Risks associated with poorly performed colonics — electrolyte imbalance, bowel perforation, infection — are very rare in proper clinical practice but rise in unregulated settings. This is why professional accreditation matters so much.
The NHS advises that colonic irrigation is not suitable for everyone and recommends consulting your GP if you have any existing health conditions. I fully support this.
Who Is Colonic Irrigation Suitable For?
Colonic irrigation may be appropriate for healthy adults experiencing digestive discomfort, bloating, or constipation, or those taking a supported approach to cleansing and gut health. Many of my clients come as part of a broader naturopathic programme rather than as a one-off treatment.
You are likely a suitable candidate if you:
- Are in generally good health with no active bowel disease
- Have spoken to your GP if you have any pre-existing conditions
- Are not currently pregnant
- Have not had bowel surgery in the past six months
- Are not experiencing acute gastrointestinal symptoms such as active bleeding
I review each client’s health questionnaire carefully before we begin. Individual assessment always matters more than any general checklist.
Who Should Avoid Colonic Irrigation?
Colonic irrigation is not suitable for everyone. You should not undergo a colonic without specific clearance from your doctor if you have any of the following:
- Crohn’s disease or ulcerative colitis (active flare)
- Diverticulitis (during an acute episode)
- Colorectal cancer
- Severe haemorrhoids or rectal bleeding
- Recent abdominal or bowel surgery
- Kidney disease
- Congestive heart failure
- Severe anaemia
- Pregnancy
If you are unsure, please speak to your GP first. I would always rather help you make the right decision for your health than carry out a procedure that is not appropriate for you.
How to Know Whether a Therapist Is Qualified
This is the most important safety consideration of all. Not everyone offering colonic irrigation in the UK is trained to the same standard.
ARCH accreditation. The Association and Register of Colon Hydrotherapists sets the standards for training, equipment, hygiene, and professional conduct in the UK. You can verify a therapist’s membership via the ARCH website.
CNHC registration. The Complementary and Natural Healthcare Council is the government-backed regulator for complementary health practitioners. My registration number is CNHC04200.
Single-use equipment. A qualified therapist uses sterile, single-use tubing for every client without exception. Always ask if it is not volunteered.
A pre-session health questionnaire. Before your session begins, you will complete a detailed five-page health questionnaire. I read this carefully before we start and will briefly discuss anything relevant — and if you have already messaged me on WhatsApp with questions beforehand, we will often have covered the essentials already. The real conversation happens during the session itself, where I can respond to what I am actually observing and address your specific concerns properly. By the end I will give you tailored recommendations — supplements, dietary adjustments, lifestyle changes — and often a sample product chosen specifically for you.
You can read more about what to expect on the Colonic Irrigation FAQs page.
What Does a Session Feel Like?
Most clients are surprised by how comfortable it is. With a gravity-controlled approach the sensation is gentle — a mild fullness and release, working gradually rather than all at once. There is no pain in a well-conducted session, and I talk you through each stage as it happens.
After the session many clients feel lighter and less bloated. Some feel a little tired and benefit from a quieter afternoon. I advise drinking plenty of water, eating lightly, and avoiding alcohol on the day.
The Benefits When Done Well
When performed safely by a qualified practitioner, colonic irrigation can be a meaningful part of a gut health programme — supporting relief from bloating and constipation and providing a useful reset point for dietary and lifestyle changes. Explore more on the colonic health benefits page.
Ready to Book?
If you would like to discuss whether colonic irrigation is right for you, I warmly invite you to get in touch. Every new client begins with a thorough questionnaire and I am happy to answer questions on WhatsApp before you commit to booking.
Phenomenal Colonics Balance On The Lane, 16 England’s Lane, Belsize Park, London NW3 4TG
📞 +44 (0)7982 831239 | WhatsApp available
About the Author
Marijke Vogel is an ARCH-accredited colon hydrotherapist and naturopath with over 25 years of clinical experience. She practises at Balance On The Lane in Belsize Park, North London, and holds professional memberships with ARCH, CNHC (CNHC04200), MGNI, IFA, IAIM, URHP, and MHA.
This content is for informational purposes only and does not constitute medical advice. Colonic irrigation is not suitable for everyone. Always consult your GP or a qualified healthcare professional before undergoing any new treatment, particularly if you have an existing health condition.
