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5 peer-reviewed studies
What the evidence says
Most Peppermint Oil studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2014–2023 with a typical study size of 726 participants.
Based on 5 studies · 3 meta-analyses · 1 RCT · 1,938 total participants
Confidence
HighBy outcome
1 study in the last 5 years · Latest meta-analysis: 2020
Across 12 RCTs (835 patients), peppermint oil more than doubled the likelihood of global symptom improvement (RR 2.39) and significantly reduced abdominal pain (RR 1.78), with NNT of 3-4.
Alammar N, Wang L, Saberi B, Nanavati J, Holtmann G, Shinohara RT, Mullin GE · BMC Complement Altern Med (2019)
In nine RCTs (726 patients), enteric-coated peppermint oil was significantly superior to placebo for global IBS symptom improvement (RR 2.23) and abdominal pain (RR 2.14), with only mild, transient adverse events.
Khanna R, MacDonald JK, Levesque BG · J Clin Gastroenterol (2014)
In this Cochrane review, peppermint plus caraway oil probably produced a large improvement in global functional-dyspepsia symptoms at four weeks (SMD -0.87, moderate certainty) and increased the improvement rate (RR 1.53).
Báez G, Vargas C, Arancibia M, Papuzinski C, Franco JV · Cochrane Database Syst Rev (2023)
Across 33 trials of Western herbal medicines, peppermint essential oil was one of only three (with aloe vera and asafoetida) shown to be efficacious and well-tolerated for short-term IBS management, and the only one with replicated positive trials.
Hawrelak JA, Wohlmuth H, Pattinson M, Myers SP, Goldenberg JZ, Harnett J, et al. · Complement Ther Med (2020)
In a 4-week RCT of 72 IBS-M/IBS-D patients, a sustained-release peppermint oil formulation cut the Total IBS Symptom Score by 40% vs 24% with placebo (p=0.025), with significant relief as early as 24 hours.
Cash BD, Epstein MS, Shah SM · Dig Dis Sci (2016)