Surprising
Peppermint oil dropped systolic blood pressure by 8.5 mmHg in a 20-day trial — but diastolic pressure, heart rate, and mood stayed flat.
This small, short study found a surprisingly strong effect on one specific blood pressure number, but it’s the first of its kind, and none of the other cardiometabolic markers budged — so the picture is intriguing but far from conclusive.
In a 20-day trial of 40 people with pre- or stage 1 hypertension, taking 100 μL of peppermint oil daily (split into two doses) lowered systolic blood pressure by about 8.5 mmHg more than placebo. However, the same study found no effect on diastolic blood pressure, resting heart rate, sleep quality, or well-being — so the benefit appears to be narrow, and the evidence is too preliminary to act on.
Where this fits in the evidence
This is among the first studies we've indexed on Peppermint for Reduced Blood Pressure — treat it as an early signal until more research accumulates.
The study
- Randomized Controlled Trial (RCT)
- n = 40
- 2026-04-23
- PloS one
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.