Natural Remedies for IBS: What Research Actually Supports

Around 12% of people in the UK have IBS, and roughly half of them have never been formally diagnosed. If you’re one of them, you’ve probably been told to “manage stress” and “eat more fibre” without much detail on what that actually looks like.

The reality is that IBS responds to specific, evidence-based strategies, not vague lifestyle advice. This guide covers the natural remedies for IBS that have genuine research behind them, where the hype outpaces the evidence, and how to relieve IBS symptoms naturally based on what’s worth trying first.

What Actually Drives IBS Symptoms

IBS isn’t a single problem with a single fix. It’s a functional gut disorder driven by a combination of factors that vary from person to person.

The most common triggers include visceral hypersensitivity (your gut nerves overreacting to normal stimuli), disrupted communication along the gut-brain axis, altered gut motility, and changes to your gut microbiome composition.

This is why no single remedy works for everyone. The most effective approach combines dietary changes, targeted supplements, and stress management based on your specific symptom pattern, whether that’s IBS-D (diarrhoea-dominant), IBS-C (constipation-dominant), or IBS-M (mixed).

Here’s how the main evidence-based natural remedies compare at a glance:

The Low-FODMAP Approach: First-Line Dietary Strategy

If you haven’t tried a low-FODMAP diet yet, this is probably where to start. FODMAPs are short-chain carbohydrates that ferment rapidly in the gut, drawing in water and producing gas. For people with IBS, this process triggers bloating, cramping, and altered bowel habits.

A 2014 randomised crossover trial in Gastroenterology (Halmos et al.) tested a low-FODMAP diet against a typical Australian diet in 30 IBS patients. The low-FODMAP group saw symptom scores drop by roughly 50%, with significant reductions in bloating and abdominal pain.

NICE currently recommends dietary modification as a first-line approach for IBS management. The low-FODMAP protocol works in three phases.

Phase 1 (Elimination, 2-6 weeks): Remove high-FODMAP foods including wheat, onions, garlic, certain fruits, lactose, and legumes.

Phase 2 (Reintroduction, 6-8 weeks): Systematically reintroduce one FODMAP group at a time to identify your specific triggers. Most people react to only one or two groups, not all of them.

Phase 3 (Personalisation, ongoing): Eat as broadly as possible while avoiding only your confirmed triggers.

The critical point most people miss: low-FODMAP is not meant to be permanent. Staying on strict elimination long-term can reduce gut bacterial diversity, which may worsen symptoms over time. Work with a registered dietitian if possible, particularly for the reintroduction phase.

Fermented Foods and IBS: A Nuanced Picture

The relationship between IBS and fermented foods is more complicated than “fermented foods are good for your gut, so eat more of them.”

Some fermented foods are high-FODMAP. Kombucha can be high in fructose, and kefir contains lactose.

Sauerkraut and kimchi are generally better tolerated because the fermentation process breaks down much of the fermentable carbohydrate content.

A 2021 Stanford study in Cell (Wastyk et al.) found that a high-fermented-food diet increased microbiome diversity and reduced inflammatory markers over ten weeks. While this study wasn’t IBS-specific, the mechanism is relevant: greater microbial diversity is consistently associated with better gut function.

For IBS, the approach that tends to work is starting with small amounts of low-FODMAP fermented foods and building up gradually. For a deeper look at what the evidence says about specific fermented foods, see our full guide to fermented foods and gut health.

Good starting options if you have IBS:

• Sauerkraut (unpasteurised, 1-2 tablespoons with meals)
• Kimchi (small portions, check for garlic content)
• 24-hour fermented yoghurt (most lactose broken down)
• Naturally fermented supplements that deliver live cultures within a fermented matrix rather than isolated strains in a capsule

If dairy is a trigger, there are dairy-free probiotic options worth considering.

Peppermint Oil: The Strongest Herbal Evidence

Of all the herbal remedies for IBS, peppermint oil has by far the most robust clinical evidence.

A 2019 meta-analysis in BMC Complementary Medicine and Therapies (Alammar et al.) pooled data from 12 randomised controlled trials covering 835 patients. Peppermint oil was more than twice as effective as placebo for global IBS symptom improvement (RR 2.39) and significantly better for abdominal pain specifically.

Peppermint oil works by relaxing smooth muscle in the intestinal wall, which reduces the spasms that cause cramping and discomfort. For IBS pain relief, natural options don’t come much stronger than this. It also has mild antimicrobial and anti-inflammatory properties.

A few practical points worth knowing:

Enteric-coated capsules are essential. Uncoated peppermint oil can cause heartburn by relaxing the lower oesophageal sphincter.

Standard dosing in the trials was 0.2-0.4ml of oil per capsule, taken 30 minutes before meals. This is the format with the strongest evidence for IBS pain relief.

Peppermint tea is a different proposition. The concentration of menthol in tea is far lower than in capsules, and no controlled trial has demonstrated the same effect. Herbal teas for IBS, including peppermint, chamomile, and fennel, may help with mild symptoms but the evidence is anecdotal rather than clinical.

Getting Fibre Right (It’s Not as Simple as “Eat More”)

The generic advice to “eat more fibre” for IBS is incomplete and can actively make things worse if you get the type wrong.

There are two categories that matter here: soluble fibre (dissolves in water, forms a gel) and insoluble fibre (doesn’t dissolve, adds bulk). For IBS, soluble fibre helps. Insoluble fibre, particularly wheat bran, can worsen bloating and pain.

A randomised trial (Bijkerk et al., published in the BMJ, 2009) compared psyllium husk, wheat bran, and placebo in 275 IBS patients over 12 weeks. Psyllium significantly outperformed both bran and placebo.

After three months, psyllium reduced symptom severity by 90 points compared to 49 for placebo. Bran showed no significant benefit and more participants dropped out due to worsening symptoms.

Good soluble fibre sources for IBS:

• Psyllium husk (start with half a teaspoon daily and increase slowly)
• Oats
• Flaxseed (ground)
• Carrots, parsnips, sweet potato

Increase fibre gradually over two to three weeks. A sudden jump in intake, even soluble fibre, will cause bloating. Drink extra water alongside it.

Probiotics for IBS: What the Evidence Actually Shows

Probiotics are one of the most researched natural interventions for IBS, but the results are only meaningful if you pay attention to strains rather than brand names or CFU counts.

A major 2018 meta-analysis in Alimentary Pharmacology & Therapeutics (Ford et al.) reviewed 53 randomised controlled trials covering over 5,500 IBS patients. Probiotics as a group showed a modest benefit for global symptoms and abdominal pain, but the effect varied enormously depending on the specific strain used. Generic multi-strain products with 10 or more species performed no better than single well-studied strains.

The strains with the most consistent evidence include Lactobacillus plantarum 299v (shown to reduce bloating and pain in multiple trials), Lactobacillus rhamnosus GG, and Bifidobacterium infantis 35624. For IBS-D specifically, Saccharomyces boulardii is worth highlighting separately. It’s technically a yeast rather than a bacterium, which means it isn’t disrupted by antibiotics and has a different mechanism of action to bacterial strains. A 2015 systematic review found it effective for reducing diarrhoea frequency and urgency in IBS-D patients, making it a useful option for those whose primary complaint is loose stools and urgency rather than bloating or constipation.

The delivery format also matters. A naturally fermented supplement delivers live cultures alongside postbiotic compounds and organic acids produced during fermentation. This more closely resembles how fermented foods interact with the gut than isolated freeze-dried strains in a capsule. For a detailed breakdown of which strains are best for specific IBS subtypes, see our guide to the best probiotics for IBS in the UK.

Other Supplements That Show Promise

L-glutamine

A 2019 randomised trial in Gut (Zhou et al.) found that L-glutamine supplementation significantly reduced IBS-D symptom severity and intestinal permeability. This is a relatively new area of research and more trials are needed, but the mechanism is plausible: glutamine is the primary fuel source for intestinal epithelial cells and may help restore gut barrier integrity.

Digestive enzymes

There is limited but growing evidence that digestive enzyme supplements may help with specific IBS triggers, particularly lactose and fructan intolerance. These are not a blanket solution, but may be useful alongside FODMAP reintroduction to identify and manage specific sensitivities.

Stress, the Gut-Brain Axis, and Why It Matters

If you’ve noticed that your IBS flares during stressful periods, that’s not coincidental. The gut and brain communicate constantly through the vagus nerve, and stress directly affects gut motility, sensitivity, and microbiome composition.

Gut-directed hypnotherapy has some of the strongest evidence of any psychological intervention for IBS. Clinical trials have shown response rates of around 70% for IBS symptoms, comparable to the low-FODMAP diet. In the UK, the NHS does fund gut-directed hypnotherapy in some areas, though availability varies.

Other approaches with supporting evidence include cognitive behavioural therapy (CBT) adapted for IBS, regular moderate exercise (shown to reduce IBS symptom severity in a 2011 RCT in the American Journal of Gastroenterology), and mindfulness-based stress reduction.

The practical takeaway: if you want to treat IBS naturally, you need to address the brain side as well as the gut side. If stress is a clear trigger for you, a psychological approach may be as effective as any dietary change. For more on how this connection works, see our guide to the gut-brain axis.

What to Cut Back On

What you remove can matter as much as what you add. Several common dietary factors are consistently associated with worsening IBS symptoms.

Alcohol irritates the gut lining and affects motility. Caffeine stimulates colonic contractions, which can be problematic for IBS-D.

Artificial sweeteners (particularly sorbitol and mannitol) are FODMAPs and directly trigger symptoms. Ultra-processed foods tend to be high in emulsifiers and additives that may disrupt the gut barrier.

For a detailed breakdown of specific foods and the evidence behind them, see our post on the worst foods for gut health.

Supporting Your Gut with Biome Bliss

If you’re looking for a naturally fermented supplement to support your gut alongside these dietary and lifestyle changes, Biome Bliss is designed for exactly this purpose. It contains six research-supported strains, including Lactobacillus plantarum, Lactobacillus rhamnosus, and Saccharomyces boulardii, fermented in organic honey and apple juice with 25 organic herbs.

Unlike standard capsule formats, Biome Bliss delivers its cultures within a naturally fermented matrix, more closely replicating how fermented foods support the gut. This means you get live cultures alongside the organic acids and postbiotic compounds produced during fermentation.

Try Biome Bliss here →

Frequently Asked Questions

How can I relieve IBS symptoms naturally?

The most effective evidence-based approaches are a low-FODMAP diet, enteric-coated peppermint oil for pain, soluble fibre such as psyllium husk, strain-specific live cultures, and stress management through gut-directed hypnotherapy or CBT. Combining two or three of these strategies tends to produce better results than relying on one alone.

What is the best herbal remedy for IBS?

Peppermint oil has the strongest evidence of any herbal remedy for IBS. A 2019 meta-analysis of 12 trials found it more than twice as effective as placebo for global symptom improvement. Use enteric-coated capsules taken 30 minutes before meals for a therapeutic dose. Chamomile and fennel teas may offer mild relief but lack robust clinical evidence.

Are fermented foods good for IBS?

Fermented foods can support IBS management, but some are high-FODMAP and may worsen symptoms. Start with low-FODMAP options like unpasteurised sauerkraut or 24-hour fermented yoghurt in small amounts. A 2021 Stanford study found a high-fermented-food diet increased microbiome diversity and reduced inflammation.

Do live cultures help with IBS?

Research suggests certain strains may help with IBS, but results depend heavily on which strain is used. A 2018 meta-analysis of 53 trials found a modest overall benefit. The strongest IBS-specific evidence supports Lactobacillus plantarum 299v, Lactobacillus rhamnosus GG, Bifidobacterium infantis 35624, and Saccharomyces boulardii for IBS-D. Naturally fermented formats may outperform standard capsules.

What supplements are best for IBS?

The supplements with the strongest evidence are enteric-coated peppermint oil for pain, psyllium husk for bowel regularity, and strain-specific live cultures. L-glutamine shows promise for IBS-D specifically. Introduce one supplement at a time so you can identify what’s actually helping.

Can IBS be managed naturally without medication?

Many people manage IBS effectively without prescription medication. NICE guidelines recommend dietary and lifestyle changes as a first-line approach. A low-FODMAP diet, regular exercise, stress management, and targeted supplements may reduce symptom frequency significantly. Speak to your GP if symptoms are severe, as some cases benefit from medication alongside natural approaches.

References

• Halmos EP et al. A diet low in FODMAPs reduces symptoms of irritable bowel syndrome. Gastroenterology. 2014;146(1):67-75. PubMed
• Alammar N et al. The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis of the pooled clinical data. BMC Complementary Medicine and Therapies. 2019;19:21. PubMed
• Ford AC et al. Efficacy of prebiotics, probiotics, and synbiotics in irritable bowel syndrome and chronic idiopathic constipation: systematic review and meta-analysis. Alimentary Pharmacology & Therapeutics. 2018;48(10):1044-1060. PubMed
• Bijkerk CJ et al. Soluble or insoluble fibre in irritable bowel syndrome in primary care? Randomised placebo controlled trial. BMJ. 2009;339:b3154. PubMed
• Wastyk HC et al. Gut-microbiota-targeted diets modulate human immune status. Cell. 2021;184(16):4137-4153. PubMed
• Zhou Q et al. Randomised placebo-controlled trial of dietary glutamine supplements for postinfectious irritable bowel syndrome. Gut. 2019;68(6):996-1002. PubMed

This article is for informational purposes only and does not constitute medical advice. IBS symptoms can overlap with other conditions. If your symptoms are new, worsening, or accompanied by weight loss, rectal bleeding, or fever, see your GP for assessment. If you’re considering supplementation, speak to your GP or a registered dietitian first.