Peppermint oil cuts systolic BP 8.5 mmHg in trial
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- University of Lancashire researchers found that 100 microliters of peppermint oil taken twice daily for 20 days reduced systolic blood pressure by an average of 8.5 mmHg in adults with prehypertension or stage 1 hypertension.
- The randomized placebo-controlled trial enrolled 40 adults aged 18-65; the comparison group received a peppermint-flavored placebo without the active oil and showed no meaningful blood pressure change.
- Findings were published in PLOS One in 2026, with lead author Dr. Jonnie Sinclair noting that high blood pressure is one of the biggest causes of heart disease and death worldwide and that standard medicines can cause unwanted side effects.
- Beyond systolic blood pressure, the researchers tracked body measurements, blood test results, diastolic blood pressure, heart rate, mental well-being, and sleep quality as secondary outcomes.
- Peppermint oil naturally contains menthol and flavonoids, and Sinclair described it as low-calorie, inexpensive, and well-tolerated — positioning it as a potential simple additional option for the millions with elevated blood pressure.
Why it matters: An 8.5 mmHg systolic drop is clinically meaningful, but this is a 40-person pilot — not a treatment recommendation. If larger trials replicate it, a low-cost, well-tolerated botanical could become a practical adjunct for the large global population with mildly elevated blood pressure who don't yet qualify for or tolerate standard medications.
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