Reviewed guidance
Enteric-coated peppermint oil (a concentrated essential-oil preparation) has randomized controlled trial evidence and meta-analyses reporting benefit versus placebo for global symptoms and abdominal pain in adults with irritable bowel syndrome (IBS).
Enteric-coated peppermint oil capsules should be taken as directed. The standard adult dosage is 0.2 to 0.4 mL (180-400 mg) three times daily, typically 30 to 60 minutes before meals to ensure the capsule passes through the stomach while empty and releases in the intestines.
Peppermint oil contains constituents including menthol, menthone, pulegone and menthofuran; regulatory assessment reports (EMA) and professional safety reviews note toxicological concerns about pulegone/menthofuran and provide tolerability/limit considerations (e.g., TDI calculations and recommended limits in preparations). Independent professional safety assessments (e.g., Cosmetic Ingredient Review final report) recommend limits on pulegone concentration (e.g., ≤1% for certain uses) and document animal data (pulegone-related findings) that inform safety considerations for peppermint-derived ingredients (leaf, oil, extracts).
Get medical care for symptoms that are severe, last longer than expected, get worse, or otherwise concern you.
Practical ways to use the ingredient may not provide the same form or amount discussed in the evidence.
Product-selection guidance for the oral enteric-coated peppermint-oil form studied for short-term IBS symptom relief.
How to choose and use a labeled diluted topical peppermint-oil preparation without improvising an essential-oil dilution.
Evidence transparency
BMC Complementary Medicine and Therapies · 2019
Enteric-coated peppermint oil was shown to be safe and effective for pain and global symptoms in adults with IBS.