People shopping for gut health supplements usually look at probiotics, prebiotic fibre and digestive enzymes. We explain what each contains, what the evidence says and where it's limited, and how to compare the cost per day. Fibre, fluids and a varied diet matter more than any capsule, so we start there.
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What are the best supplements for gut health?
There isn't a single best gut health supplement, and for most people diet matters more: the NHS advises aiming for 30g of fibre a day and to keep drinking, especially water. Probiotics have the most research, but results depend on the specific strain and the reason you're taking one.
This collection includes probiotics, prebiotic fibres such as inulin, digestive enzymes such as bromelain, glutamine and sodium butyrate. The table summarises what each is and what the evidence shows. You can also browse all vitamins & supplements.
| Product type | What it is | What the evidence says |
|---|---|---|
| Probiotics | Live bacteria or yeasts, counted in CFU (colony-forming units) | Some evidence in some cases. Effects depend on the strain. |
| Prebiotic fibre | Fibres such as inulin that feed gut bacteria | Counts towards your fibre intake. The BDA says more research is needed. |
| Digestive enzymes | Enzymes such as bromelain, or betaine HCl with pepsin | Only lactase has an authorised claim, at 4,500 FCC units per dose. |
| Glutamine and butyrate | An amino acid, and a salt of a short-chain fatty acid | No authorised gut health claims. We make no claims for them. |
How much fibre do you need for gut health?
Adults should aim for 30g of fibre a day, but the NHS says most adults only eat an average of about 20g a day. Wholegrains, potatoes with their skins on, beans, lentils, chickpeas, fruit and vegetables are the main sources.
Fibre supplements and prebiotic powders can top up your intake, but they don't replace the range of fibres in whole foods. Browse fibre and digestive enzymes.
Do probiotics work?
Some probiotics may help some people, but the evidence is mixed. The NHS says there's some evidence that probiotics may be helpful in some cases, and because they're classed as food rather than medicine, you can't always be sure a product contains the bacteria stated, in a large enough amount, or that they survive to reach the gut.
The British Dietetic Association says many of the studies so far have been small and inconclusive. If you try one, the NHS suggests taking it every day for at least 4 weeks to see if it works for you. Browse probiotics.
"Where evidence is limited or inconclusive, we should say so openly," says Andy Arshad, who runs SupplementHQ.
What are prebiotics?
Prebiotics are fibres that feed the bacteria already in your gut, rather than adding new ones. The BDA describes them as like fertiliser for our gut microbes and says more research on them is needed.
Inulin, often made from chicory root, is a common prebiotic fibre. Some products combine a probiotic with a prebiotic, so check the label for the amount of each.
Do digestive enzyme supplements work?
Only one digestive enzyme has an authorised health claim: "Lactase enzyme improves lactose digestion in individuals who have difficulty digesting lactose". The GB register of authorised health claims allows it only for supplements giving at least 4,500 FCC units (a standard measure of enzyme activity) with each lactose-containing meal.
The enzyme products in this collection, such as bromelain and betaine HCl with pepsin, don't carry that claim, so we don't make digestive claims for them. If you have ongoing digestive symptoms, speak to your GP before trying enzymes.
Are there supplements for bloating?
No supplement has an authorised claim for bloating, and the NHS says the most common reason for bloating is having a lot of gas in your gut. It suggests eating smaller, more frequent meals, drinking enough water, and cutting down on fizzy drinks, alcohol and caffeine.
The NHS advises seeing a GP if you feel very bloated, you're often bloated or it does not go away, or if you have bloating and unintentional weight loss. Bloating can be linked to constipation, food intolerance, coeliac disease or IBS, which need a proper diagnosis.
Are gut health supplements safe?
For most people, probiotics appear to be safe, but the NHS says if you have an existing health condition or a weakened immune system, you should talk to a doctor before taking them. The BDA gives similar advice.
Supplements for children, including kids' probiotic gummies, should be discussed with a GP or pharmacist first. If you're pregnant, breastfeeding or take medication, check with your GP or pharmacist too.
How do you compare gut health supplements?
Compare the strains named on the label, the amount per daily dose and the cost per day, not the headline CFU number alone. A label that names each strain lets you check it against the research.
"Adding more ingredients doesn't automatically make a product more effective. Each ingredient needs a clear purpose, an appropriate dose and evidence supporting its intended use," says Andy.
How to compare value (example figures, not real products): a £15 pot of 30 capsules, one a day, costs 50p a day. A £24 pot of 60 capsules, one a day, costs 40p a day. A £12 bag of 250g inulin powder, used at 5g a day, lasts 50 days, about 24p a day. Our guide to reading a supplement label explains what to look for.
We sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is general information for adults, not personalised medical advice. Food supplements should not replace a varied, balanced diet.
Written by Andy Arshad, SupplementHQ. Last reviewed 11 October 2026.