Colonic infusions: what the evidence shows

An infusion adds a solution to the water used during a colonic irrigation session. Four are offered at Brunswick Health: probiotic, organic coffee, turmeric and alkalising greens.

They are popular, and the evidence for them is thinner than the marketing across this industry suggests. What follows is an honest account, because you are better served deciding with accurate information than being sold on a claim that does not hold.

Probiotic infusion

What it is. A solution containing live bacterial cultures, introduced towards the end of a session.

The reasoning. Irrigation clears the bowel contents, including some of the resident bacteria. A probiotic infusion is intended to reintroduce beneficial organisms.

What the evidence shows. Oral probiotics have a reasonable and growing evidence base for specific indications — antibiotic-associated diarrhoea, some irritable bowel symptoms, with effects that are strain-specific rather than general.

Rectal administration of probiotics has been studied far less. The area where evidence is genuinely strong is faecal microbiota transplantation for recurrent Clostridioides difficile infection, which is a different intervention entirely: a full microbial community, delivered under medical supervision, for a specific diagnosed infection.

Whether a probiotic infusion during a colonic meaningfully or durably changes the gut microbiome has not been established. It is plausible; it is not demonstrated.

Honest position. Reasonable rationale, limited direct evidence. If gut microbiome support is the goal, oral probiotics and dietary fibre have far more research behind them and cost considerably less.

Coffee infusion

What it is. Cooled, filtered organic coffee introduced during the session.

The reasoning. Historically based on claims about stimulating bile flow and liver detoxification pathways.

What the evidence shows. Very little. The liver detoxification claims are not supported by clinical evidence in this context. Caffeine is absorbed through the bowel wall, so some systemic effect occurs, but the specific claims made for coffee infusions are not established.

Safety notes worth stating. Case reports in the medical literature describe serious adverse events associated with coffee enemas, including electrolyte disturbance, colitis and, rarely, deaths. Those reports generally involve frequent, unsupervised home use at high volume rather than an occasional supervised clinical session — but they are the reason this one carries a caution the others do not, and the reason frequency matters.

Honest position. The most popular of the four and the one with the weakest supporting evidence and the most documented risk. If you want it, occasional and supervised is a materially different proposition from a home routine.

Turmeric infusion

What it is. A turmeric solution added to the session.

The reasoning. Curcumin, turmeric’s principal active compound, has anti-inflammatory properties studied in laboratory and some clinical settings.

What the evidence shows. Oral curcumin has a moderate evidence base, including some trials in ulcerative colitis. The persistent difficulty is bioavailability — curcumin is poorly absorbed, which is why oral preparations combine it with piperine or use specialised formulations.

Whether rectal administration during irrigation delivers a meaningful dose to the tissue has not been studied.

Honest position. Plausible mechanism, no direct evidence for this route.

Alkalising greens infusion

What it is. A solution of green plant material.

The reasoning. Drawn from “alkalising” theory — the idea that diet and treatments can shift the body’s pH toward alkalinity with health benefits.

What the evidence shows. The underlying premise does not hold. Blood pH is tightly regulated between 7.35 and 7.45 by respiratory and renal mechanisms, and nothing introduced into the bowel changes it. A body whose blood pH has meaningfully shifted is a medical emergency, not a wellness outcome.

Eating more vegetables is good for you for reasons that have nothing to do with pH.

Honest position. The theoretical basis does not stand up. Any benefit is unlikely to be from alkalisation.

The overall position

Infusions are an optional addition to a session, and none of them is necessary. The evidence for all four in this specific route is limited to absent, and we would rather say so.

If your goal is gut health, the interventions with the strongest evidence are unglamorous and cheap: dietary fibre, a varied plant intake, adequate sleep, regular movement, and — where indicated — a specific oral probiotic strain chosen for a specific problem. A naturopathy consultation is a more evidence-aligned way to work on that than an infusion is.

If you would like an infusion anyway, having read the above, that is a reasonable informed choice and the therapists here will provide one.

Before any of this

Persistent changes in bowel habit, blood in the stool, unexplained weight loss or new abdominal pain need diagnosing first. Those symptoms have causes that no colonic or infusion substitutes for. Tell us when you enquire and we will refer you rather than book you in.