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Gut supplements: work out what you have first

Bloating is a description, not a diagnosis. The same word covers at least four different situations, and the one you are in decides whether a given product helps or makes things worse.

Last reviewed October 2026 · all guides

The cheapest diagnostic you will ever run

Before buying anything, keep a plain record for a fortnight: what you ate, when symptoms arrived relative to eating, and what form they took. That is it. The value is in the timing, because timing separates the main possibilities more reliably than the symptoms themselves do. Discomfort within half an hour points upward, toward the stomach and bile. A build-up two or three hours later points at fermentation further down. Pain relieved by opening the bowels points at the colon. Symptoms unrelated to meals at all point somewhere else entirely, and that is worth knowing before you spend.

What the timing suggests, and what it rules in or out.
When it happensSuggestsHelped byMade worse by
Within 30 minutesStomach emptying, bile response Bitters, enzymes, smaller portionsLarge fatty meals
1–3 hours afterFermentation in the small bowel Lower-fermentation eatingInulin and chicory-root fibre
Relieved by passing stoolColon, often IBS pattern Soluble fibre, peppermint oilSudden large fibre increases
Unrelated to mealsSomething else AssessmentGuesswork

Test before you eliminate

One sequencing point matters more than anything else on this page. Coeliac testing only works while you are still eating gluten. Cut it out first and the test returns a false negative, and the only way back is to eat gluten again for weeks before retesting, which nobody enjoys. Coeliac disease is common, frequently mistaken for ordinary bloating for years, and has a specific treatment. If you are contemplating any elimination diet, get the blood test booked before you change what you eat, not after.

Then, if you want to eliminate

A structured low-fermentation trial run properly is a diagnostic rather than a diet: restrict for a few weeks, then reintroduce groups one at a time to find which actually matter. Done without the reintroduction phase it just becomes a permanently narrower diet, which is worse for the gut rather than better. Doing it with a dietitian is genuinely worth the cost if that is available to you.

Assessment rather than a purchase: bleeding, visible or as black tarry stools; weight dropping without trying; trouble swallowing; vomiting that keeps returning; low iron on a blood test; anything that wakes you from sleep; and a bowel habit that changes and stays changed after fifty. Inflammatory bowel disease and coeliac disease both hide behind ordinary bloating for years, and both have treatments worth getting to.

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Questions people ask

What should I record in a symptom diary?

Three columns are enough: what you ate, the gap before symptoms started, and what the symptoms were. Two weeks of that is more informative than any single product trial, because the timing pattern narrows the possibilities in a way the symptom description alone cannot.

Should I cut out gluten to see if it helps?

Not before being tested. Coeliac screening only works while gluten is still in your diet, so cutting first produces a false negative and forces you to reintroduce it for weeks to test properly. Book the blood test first, keep eating normally until it is done, then experiment.

Why would fibre make things worse?

Because fermentable fibres such as inulin and chicory root are deliberately food for your gut bacteria, and gas is what that feeding produces. If distension one to three hours after eating is your main complaint, a fermentable-fibre product is adding to the problem rather than addressing it.

How long should I give a gut supplement?

It depends entirely on the mechanism. Enzymes and bitters act on the meal in front of you, so a week tells you something. Bacterial products need four to twelve weeks. Starting several at once makes any outcome unattributable, which is the commonest self-inflicted problem here.

Is a low-FODMAP diet something to try alone?

The restriction phase is straightforward; the reintroduction phase is where the value is, and it is the part people skip. Left permanently restricted you end up with a narrower diet and a less diverse gut, which is the opposite of the goal. A dietitian is worth it if you can access one.

Can a probiotic fix IBS?

Some strains have evidence for some symptoms, and the results are strain-specific rather than general, which means a product naming its strains in full is more evaluable than one naming species. Peppermint oil has reasonable evidence for IBS pain specifically and is often overlooked.

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