The Best Supplements for Gut Health (and the Ones to Skip)

The supplement aisle is full of gut health products promising to fix bloating, heal your microbiome and transform your digestion. Some have decent evidence behind them. Many don't. Here's an honest guide to the supplements that may be worth considering, and the ones that largely aren't.

The honest disclaimer first

Food, habits and lifestyle should always come first. No supplement can replicate the effect of a varied, plant-rich diet, fermented foods, adequate sleep, regular movement and managed stress. See the best foods for gut health for where to start.

Supplements with reasonable evidence

Probiotic supplements

Probiotics can help restore beneficial gut bacteria after antibiotics, and certain strains have evidence for specific conditions like IBS or traveller's diarrhoea. Strain matters enormously — look for a specific, named strain with published evidence for your concern. See probiotics vs prebiotics for the food-first approach.

Fibre supplements (psyllium husk)

Psyllium husk is a well-researched, soluble fibre supplement that helps with both constipation and diarrhoea-type symptoms. Start with a small amount, increase gradually, and drink plenty of water. See our guide on constipation and bloating.

Digestive enzymes

These can help people with reduced enzyme production. Lactase supplements are the most evidence-based, specifically for lactose intolerance. For people with normal enzyme function, they're unlikely to make much difference.

Vitamin D

Vitamin D deficiency is widespread and associated with increased gut inflammation. Correcting a confirmed deficiency (via a blood test) can have broad benefits. Worth checking with your doctor.

Supplements with limited evidence (but heavily marketed)

Collagen powders for “leaky gut”

Widely promoted, but the evidence is very limited, and the popular “leaky gut” narrative significantly outpaces the science.

Detox and cleanse supplements

Covered in our guide to gut reset vs detox — largely unsupported and sometimes counterproductive.

Expensive greens powders

The doses are often too small to have meaningful effects. You'd get more benefit from eating the actual vegetables.

Before you buy anything

For gut-specific issues, see a doctor or registered dietitian before spending money on supplements. Start with the free 7-day anti-bloat plan or the 30-Day Gut Reset first.

Speak to a doctor or pharmacist before starting supplements, especially if you take medication or have a health condition.

Frequently asked questions

What is the number one supplement for gut health?

There's no single best supplement. Probiotics (the right strain for your concern) and psyllium husk have the most general support. Food-based approaches consistently outperform supplementation for most people.

Do gut health supplements work?

Some do, for specific purposes and the right people. Many are overhyped. Quality, strain specificity and dosage all matter enormously.

Should I take a probiotic every day?

If you've identified a specific probiotic with evidence for your concern, daily use is generally safe. Food-based probiotics — yoghurt, kefir, kimchi — are a consistent, well-supported daily alternative.