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

The supplement aisle for gut health is enormous — probiotics, prebiotics, digestive enzymes, L-glutamine, collagen, activated charcoal and dozens more. Some have real evidence. Many are marketing, sold with claims that outrun the science. Here's an honest breakdown of what's worth considering and what to prioritise instead.

Food first, always

The honest starting point: for most healthy people, food does this better. Fermented foods, fibre-rich plants and a varied diet cover what most gut supplements try to replicate, usually more effectively and at a fraction of the cost. Supplements make most sense when it's genuinely hard to get something from food, or when you have a specific need. That said, here's what the evidence supports.

Supplements worth considering

Probiotic supplements

Probiotics have the most research behind them in this category. Specific strains have evidence for particular uses — some Lactobacillus and Bifidobacterium strains for IBS symptoms, for example, or during and after a course of antibiotics. The catch: strain matters (not all probiotics are the same), and quality varies enormously between brands. See our guide on probiotics vs prebiotics for the basics.

Prebiotic fibre supplements (psyllium, inulin)

Psyllium husk has solid evidence for improving bowel regularity and is widely used. Inulin-based prebiotics can feed good bacteria but may also cause gas in sensitive people — start with a small amount and increase gradually.

Peppermint oil (enteric-coated)

Enteric-coated peppermint oil capsules have reasonable evidence for reducing IBS symptoms including bloating, cramping and gas. They need to be enteric-coated so they reach the intestine rather than dissolving in the stomach.

Digestive enzymes

Can help specific issues — lactase supplements for lactose intolerance are the best example. Broad digestive enzyme blends have less clear evidence for general everyday use.

Supplements with limited evidence for most people

L-glutamine: Popular in gut health content, but evidence in otherwise healthy adults is limited. More relevant in clinical settings.

Collagen peptides: Popular, but evidence for meaningful gut health benefits is preliminary.

Activated charcoal: Sometimes marketed for bloating, with limited evidence; can interfere with medications and nutrient absorption. Not recommended as a regular supplement.

Before buying anything

Check whether a specific product has research behind it (not just the category), buy from reputable brands with third-party testing, and speak to your doctor or a dietitian first if you're managing a health condition. For most people, the money is better spent on a more varied, plant-rich diet. The 30-Day Gut Reset builds that diet into a structured plan, or start with the free 7-day anti-bloat guide.

This article is general information and not medical advice. Discuss supplement use with a healthcare professional if you have a health condition.

Frequently asked questions

What is the best supplement for gut health?

For general gut health, a quality probiotic with evidence-backed strains and psyllium husk for regularity have the most support. But fermented foods and fibre-rich plants are generally more effective than supplements.

Do I need gut health supplements?

Most healthy people don't, if they're eating a varied, plant-rich diet with fermented foods. Supplements have a role in specific situations but aren't essential for healthy everyday gut maintenance.

Are probiotic supplements safe?

For most healthy adults, yes. Check with your doctor if you're immunocompromised or have a serious illness, as some probiotics aren't appropriate in those situations.