Oil

    Peppermint Oil

    Mentha piperita oil

    TL;DR

    Enteric-coated peppermint oil is one of the best-evidenced treatments for irritable bowel syndrome, with meta-analyses showing it outperforms placebo for global symptoms and abdominal pain. The enteric coating is the entire point.

    Ideal For

    • IBS with pain, cramping and bloating
    • Post-infectious IBS
    • Functional abdominal pain
    • Reducing spasm before colonoscopy or barium studies

    Avoid If

    • Gastro-oesophageal reflux disease or hiatus hernia
    • Achlorhydria, where enteric coatings may dissolve early
    • Gallstones or bile duct obstruction
    • Infants and young children — menthol can cause laryngospasm

    Frequently Asked Questions

    Overview

    Peppermint oil is the supplement most likely to be recommended by a gastroenterologist, and with good reason. Meta-analyses of randomised trials in irritable bowel syndrome consistently find it superior to placebo for global symptom improvement and for abdominal pain, with numbers needed to treat in the range of three to five — better than most pharmaceutical options for the same condition. The American College of Gastroenterology includes it in its IBS guidance. The mechanism is straightforward smooth muscle relaxation: menthol blocks calcium influx into intestinal smooth muscle cells, an antispasmodic action comparable in kind to hyoscine but delivered locally. Formulation is what separates a working product from an unpleasant one. Uncoated peppermint oil is released in the stomach, where it relaxes the lower oesophageal sphincter and causes heartburn — the most common reason people abandon it — while enteric-coated capsules survive gastric acid and release in the small intestine where the antispasmodic action is wanted. Some newer formulations target the ileocolonic region specifically. Peppermint oil is also used, with weaker evidence, for functional dyspepsia in combination with caraway, and topically for tension headache.

    How It Works

    • Menthol blocks L-type calcium channels, relaxing intestinal smooth muscle
    • TRPM8 activity may reduce visceral pain sensitivity
    • Antimicrobial activity relevant to bacterial overgrowth
    • Enteric coating is required to bypass the stomach and prevent reflux

    Quick Facts

    • Number needed to treat of roughly 3-5 in IBS meta-analyses
    • Included in American College of Gastroenterology IBS guidance
    • Must be enteric-coated or it causes heartburn
    • Take before meals, never with antacids

    Benefits & Outcomes

    Gas Reduction

    Digestive
    Likely effective
    Strong Evidence
    Effectiveness 4/5

    Strong evidence for symptom relief; use the enteric-coated form.

    Bloating Reduction

    Digestive
    Strong yes
    Strong Evidence

    Enteric-coated peppermint oil is among the best-evidenced treatments for functional bloating.

    Intestinal Motility

    Digestive
    Mixed evidence
    Moderate Evidence

    Enteric-coated peppermint oil relieves IBS pain and bloating but relaxes rather than accelerates motility.

    SIBO Prevention

    Digestive
    Likely effective
    Moderate Evidence

    Enteric-coated peppermint oil is well evidenced for the bloating and pain, though not for preventing overgrowth itself.

    Gut-Brain Axis Support

    Digestive
    Likely effective
    Moderate Evidence
    Effectiveness 4/5

    One of the better-evidenced options for IBS symptoms specifically.

    Health Concerns Addressed

    IBS (Irritable Bowel Syndrome)

    condition
    Strong yes
    Strong Evidence
    Effectiveness 4/5

    The best-evidenced supplement for IBS, and recognised in gastroenterology guidance. Just make sure it is enteric-coated and taken before meals.

    Abdominal Cramping

    symptom
    Likely effective
    Strong Evidence
    Effectiveness 4/5

    Strong trial support for IBS-type cramping; the NNT for global symptom improvement is around 3–4, comparable to pharmaceutical antispasmodics with fewer side effects.

    Food Sensitivities

    symptom
    Likely effective
    Moderate Evidence
    Effectiveness 3/5

    One of the better-evidenced options for post-meal cramping, provided the capsule is enteric-coated.

    Stomach Pain

    symptom
    Likely effective
    Moderate Evidence
    Effectiveness 4/5

    Enteric-coated peppermint oil has the best trial evidence of any supplement for functional abdominal pain, but only once IBS is the confirmed diagnosis.

    Bloating & Gas

    symptom
    Likely effective
    Moderate Evidence
    Effectiveness 3/5

    Meta-analyses support benefit for IBS-type bloating and cramping; it moves gas rather than reducing its production.

    Supporting Research
    16 studies

    Peppermint oil for irritable bowel syndrome: a systematic review and meta-analysis

    Score: 7/10
    2019
    meta_analysis
    n=835

    Alammar N, Wang L, Saberi B +4 more

    Peppermint oil significantly improved global IBS symptoms and abdominal pain versus placebo

    View source

    Systematic review and meta-analysis: efficacy of peppermint oil in irritable bowel syndrome

    Score: 8/10
    2022
    meta_analysis
    n=1030

    Ingrosso MR, Ianiro G, Nee J +1 more

    Peppermint oil was more efficacious than placebo for global IBS symptoms (RR of not improving = 0.65; 95% CI 0.43-0.98

    View source

    Efficacy and Safety of Peppermint Oil in a Randomized, Double-Blind Trial of Patients With Irritable Bowel Syndrome (PERSUADE)

    Score: 9/10
    2020
    rct
    n=190

    Weerts ZZRM, Masclee AAM, Witteman BJM +13 more

    Neither peppermint oil formulation met the primary endpoint of abdominal pain response versus placebo, although secondary endpoints improved with small-intestinal release

    View source

    Peppermint oil in the acute treatment of tension-type headache

    Score: 5/10
    2016
    systematic_review

    Göbel H, et al

    The local topical treatment with peppermint oil (oleum menthae piperitae) has proven to be significantly more effective than placebo in controlled studies.

    View source

    Peppermint oil improves the manometric findings in diffuse esophageal spasm

    Score: 4/10
    2001
    crossover
    n=8

    Pimentel M, et al.

    This data demonstrates that peppermint oil improves the manometric features of DES.

    View source

    Efficacy and safety of peppermint oil for functional dyspepsia: a meta-analysis

    Score: 7/10
    2019
    meta_analysis

    Li J, Lv L, Zhang J +1 more

    Peppermint oil combined with caraway oil significantly improved symptoms of functional dyspepsia compared with placebo.

    View source

    Nutritional Interventions in Adult Patients With Irritable Bowel Syndrome: An Umbrella Review of Systematic Reviews and Meta-analyses of Randomized Clinical Trials

    Score: 8/10
    2025
    systematic_review

    Zeraattalab-Motlagh S, Ranjbar M, Mohammadi H +1 more

    soluble fiber, peppermint oil, and aloe vera improved IBS symptoms, and vitamin D3 and curcumin improved IBS symptom severity

    View source

    Impact of peppermint therapy on dysphagia and non-cardiac chest pain: a pilot study

    Score: 5/10
    2019
    observational
    n=38

    Khalaf MHG, et al.

    PO appears to provide symptomatic relief in some patients with dysphagia and CP.

    View source

    Systematic review and meta-analysis: efficacy of peppermint oil in irritable bowel syndrome

    Score: 8/10
    2022
    meta_analysis
    n=1241

    Ingrosso MR, Ianiro G, Nee J +4 more

    Peppermint oil was more effective than placebo for global IBS symptoms and abdominal pain, though the quality of evidence was rated low

    View source

    The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis of the pooled clinical data

    Score: 8/10
    2019
    meta_analysis
    n=835

    Alammar N, Wang L, Saberi B +4 more

    Peppermint oil significantly improved global IBS symptoms and abdominal pain compared with placebo

    View source

    Herbal therapy is equivalent to rifaximin for the treatment of small intestinal bacterial overgrowth

    Score: 5/10
    2014
    observational
    n=104

    Chedid V, Dhalla S, Clarke JO +1 more

    Of the 37 patients who received herbal therapy, 17 (46%) had a negative follow-up LBT compared to 23/67 (34%) of rifaximin users (P=.24).

    View source

    Peppermint oil for the treatment of irritable bowel syndrome: a systematic review and meta-analysis

    Score: 8/10
    2014
    meta_analysis
    n=726

    Khanna R, MacDonald JK, Levesque BG

    Peppermint oil was superior to placebo for global improvement of IBS symptoms and abdominal pain, with heartburn the most common adverse event

    View source

    Effect of fibre, antispasmodics, and peppermint oil in the treatment of irritable bowel syndrome: systematic review and meta-analysis

    Score: 8/10
    2008
    meta_analysis
    n=392

    Ford AC, Talley NJ, Spiegel BMR +4 more

    Peppermint oil produced the largest treatment effect of the three interventions, with a number needed to treat of 2.5

    View source

    The effect of enteric-coated, delayed-release peppermint oil on irritable bowel syndrome

    Score: 7/10
    2010
    rct
    n=90

    Merat S, Khalili S, Mostajabi P +3 more

    Abdominal pain was absent in 14 of 35 peppermint oil patients versus 6 of 36 placebo patients after 8 weeks

    View source

    A Novel Delivery System of Peppermint Oil Is an Effective Therapy for Irritable Bowel Syndrome Symptoms

    Score: 6/10
    2016
    rct
    n=72

    Cash BD, Epstein MS, Shah SM

    Peppermint oil reduced total IBS symptom scores significantly more than placebo as early as 24 hours

    View source

    Efficacy of soluble fibre, antispasmodic drugs, and gut-brain neuromodulators in irritable bowel syndrome: a systematic review and network meta-analysis

    Score: 9/10
    2020
    meta_analysis
    n=4644

    Black CJ, Yuan Y, Selinger CP +4 more

    Peppermint oil ranked first for global IBS symptoms and abdominal pain relief among antispasmodics, though evidence quality was low.

    View source

    Safety Information

    Potential Side Effects

    Heartburn is the main one and usually indicates the coating has failed or the timing is wrong. Also perianal burning, nausea and a peppermint taste on belching. Rare allergic reactions.

    Contraindications

    Significant reflux disease, hiatus hernia, gallstones and bile duct obstruction. Avoid oral menthol preparations in infants and young children.

    Drug Interactions

    • Antacids and proton pump inhibitors — raising gastric pH can dissolve enteric coating early; separate by two hours
    • Ciclosporin — case reports of increased levels
    • CYP3A4 substrates — modest inhibition reported in vitro

    Pregnancy & Breastfeeding

    Pregnancy: insufficient_data

    Breastfeeding: insufficient_data

    Dosage Guidelines

    Dosage Used in Studies

    180-750 mg

    Best Time to Take

    One capsule three times daily, 30-60 minutes before meals

    Best Form

    Enteric-coated capsules, 180-200 mg each

    Bioavailability

    Menthol is absorbed in the small intestine, glucuronidated in the liver and excreted renally; enteric coating determines where release occurs, which is what matters clinically.

    Forms Compared

    Enteric-coated capsules

    Ileocolonic-release capsules

    Uncoated oil

    Peppermint tea

    Food & Timing

    Before meals, not with them — food can compromise the enteric coating and trigger early release.

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.