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Does peppermint oil help irritable bowel syndrome?

Pooled trials suggest peppermint oil eases IBS symptoms and belly pain. Newer large trials were mixed, so the benefit is uncertain.

Published October 2026

Short answer

Pooled trials suggest peppermint oil eases IBS symptoms and belly pain more than placebo, but the evidence is limited and the newest large trials were mixed. Evidence grade C (Limited). Meta-analyses of 10 to 12 small trials favour peppermint oil; several newer trials found no clear benefit; downgraded for inconsistency, small samples and risk of bias.

Key takeaways

  • Pooled analyses of 10 trials (1,030 people) found peppermint oil more likely than placebo to improve global IBS symptoms and abdominal pain [1].
  • The newest large trials were mixed: an 8-week trial of 189 adults did not meet its main abdominal pain target [2], and a trial of 228 children found no clear benefit [3].
  • The evidence is of low quality, and one meta-analysis found more side effects with peppermint oil than with placebo [1].

The short version

Peppermint oil may help some people with irritable bowel syndrome (IBS). Pooled analyses of peppermint oil trials found it eased symptoms and belly pain more than placebo [1]. The newest large trials were mixed, so the benefit is uncertain [2].

What the studies show

A 2022 meta-analysis of 10 trials with 1,030 people found peppermint oil more likely than placebo to improve overall IBS symptoms and abdominal pain [1]. For global symptoms, about one extra person improved for every four treated, though the range was wide [1].

A 2019 meta-analysis of 12 trials with 835 people reached a similar conclusion [4]. A 2020 network analysis also ranked peppermint oil first for global symptoms, but only 13 of its 51 trials were judged to have a low risk of bias [5].

The newer trials were less positive. In an 8-week trial of 189 adults, neither capsule type met the main abdominal pain target [2]. A 6-week trial found peppermint oil and placebo both helped, with no significant difference between them [6]. Earlier, smaller trials were more positive, such as a 4-week trial of 72 people on a small-intestine-release capsule [7].

The nuances

Side effects were mild but more common on peppermint oil in the 2020 trial [2]. One meta-analysis found significantly more adverse events [1], while another found no significant difference [4]. One analysis also tracked reflux as a side effect [1].

The evidence quality is low. A 2022 analysis rated it very low [1]. A 2025 umbrella review of nutrition trials in IBS rated peppermint oil's effect as small, with low to very low certainty [8].

Formulation may matter. In the 2020 trial, the small-intestine version reduced pain, discomfort and symptom severity on secondary measures, but the colon-release version did not reach significance on its main measures [2]. Most trials ran for 4 to 12 weeks, so long-term effects are not known [5].

In a trial of 228 children, younger ones took the capsule twice a day and older ones three times a day, and treatment success was not significantly better than placebo [3].

Speak with a doctor first if you are pregnant, take other medicines, or have reflux, liver or kidney problems. The full safety list covers these in more detail.

What this means for you

Peppermint oil is a low-cost option that some people with IBS try, and pooled trials point to a possible benefit for symptoms and pain [1][9]. The newest large trials did not clearly confirm it, so the benefit is uncertain [2]. Talk with a doctor about IBS treatment options before starting any supplement.

Go deeper

  • Peppermint Oil — Pooled analyses of small trials find that enteric-coated peppermint oil eases IBS symptoms and belly pain more than placebo.

References

  1. Systematic review and meta-analysis: efficacy of peppermint oil in irritable bowel syndrome.. Aliment Pharmacol Ther, 2022.
  2. Efficacy and Safety of Peppermint Oil in a Randomized, Double-Blind Trial of Patients With Irritable Bowel Syndrome.. Gastroenterology, 2020.
  3. Peppermint Oil and Sweets in Pediatric Irritable Bowel Syndrome and Functional Abdominal Pain: A Randomized Trial.. Clin Gastroenterol Hepatol, 2026.
  4. The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis of the pooled clinical data.. BMC Complement Altern Med, 2019.
  5. Efficacy of soluble fibre, antispasmodic drugs, and gut-brain neuromodulators in irritable bowel syndrome: a systematic review and network meta-analysis.. Lancet Gastroenterol Hepatol, 2020.
  6. Peppermint Oil Treatment for Irritable Bowel Syndrome: A Randomized Placebo-Controlled Trial.. Am J Gastroenterol, 2021.
  7. A Novel Delivery System of Peppermint Oil Is an Effective Therapy for Irritable Bowel Syndrome Symptoms.. Dig Dis Sci, 2016.
  8. Nutritional Interventions in Adult Patients With Irritable Bowel Syndrome: An Umbrella Review of Systematic Reviews and Meta-analyses of Randomized Clinical Trials.. Nutr Rev, 2025.
  9. A trial-based economic evaluation of peppermint oil for the treatment of irritable bowel syndrome.. United European Gastroenterol J, 2021.