Randomized trial shows peppermint oil reduces systolic blood pressure in adults with hypertension — Evidence Review
Published in PLOS ONE, by researchers from University of Lancashire
Researched by
— the AI search engine for science
Table of Contents
Peppermint oil supplements lowered systolic blood pressure by an average of 8.5 mmHg in adults with mild hypertension during a 20-day randomized controlled trial. Related studies largely agree, suggesting peppermint and other natural or non-pharmacological interventions may have beneficial cardiovascular effects; details are available in the original study.
- Multiple studies have found that peppermint or its active compounds can influence blood pressure, cardiovascular health, and metabolic outcomes, though the magnitude and consistency of effects vary across study designs and populations 1 2 4 5.
- Broader literature on non-pharmacological and herbal interventions for hypertension supports the potential of natural remedies to lower blood pressure, but calls for more rigorous, long-term clinical trials to confirm efficacy and safety 6 7 8 9 10.
- Some studies suggest additional benefits of peppermint—such as improved exercise performance and metabolic health—but results are mixed regarding its effects on blood pressure, highlighting the need for further research 1 2 3 4.
Study Overview and Key Findings
High blood pressure is a leading cause of cardiovascular disease and mortality globally, with many individuals seeking alternatives to medication due to side effects or accessibility concerns. This study from the University of Lancashire explores whether daily peppermint oil supplementation could offer a simple, affordable approach for managing mild hypertension. Unlike many previous studies, it employed a double-blind, placebo-controlled design and measured not only blood pressure, but also a range of cardiometabolic and lifestyle-related outcomes over a 20-day period.
| Property | Value |
|---|---|
| Study Year | 2026 |
| Organization | University of Lancashire |
| Journal Name | PLOS ONE |
| Authors | Jonathan Sinclair, Benjamin Sant, XuanYi Du, Gareth Shadwell, Stephanie Dillon, Bobbie Butters, Lindsay Bottoms |
| Population | Adults with mild hypertension |
| Sample Size | 40 adults |
| Methods | Randomized Controlled Trial (RCT) |
| Outcome | Systolic and diastolic blood pressure, heart rate, mental well-being, sleep quality |
| Results | Peppermint oil lowered systolic blood pressure by 8.5 mmHg on average. |
Literature Review: Related Studies
To contextualize these findings, we searched the Consensus research paper database, which indexes over 200 million research papers. The following queries were used to identify relevant studies:
- peppermint oil blood pressure effects
- natural remedies hypertension treatment
- systolic blood pressure alternative therapies
Below, we group key findings from related studies into major topic areas.
| Topic | Key Findings |
|---|---|
| Does peppermint oil or its compounds affect blood pressure and cardiovascular health? | - Peppermint oil supplementation can lower blood pressure and improve cardiometabolic outcomes in some settings, but effects are not always consistent across populations and study designs 1 2 4 5. - Menthol, a key component of peppermint oil, may have vasorelaxant and cardioprotective effects 5. |
| How do natural and non-pharmacological therapies compare with traditional hypertension treatments? | - Herbal and lifestyle interventions, such as peppermint, ginseng, and dietary changes, may reduce blood pressure with fewer side effects than pharmaceuticals, but evidence quality and consistency vary 6 7 8 9 10. - DASH diet, exercise, and breathing techniques are among the most effective nonpharmacologic interventions 7 12 13 15. |
| What are the broader metabolic or psychological effects of peppermint and similar interventions? | - Peppermint may improve exercise performance, respiratory function, glycemic and lipid profiles, and mental well-being, though evidence is drawn from small or non-randomized studies 1 2 4. - Peppermint aromatherapy may improve sleep and fatigue, but effects on blood pressure are less clear or may even increase systolic BP 3 4. |
Does peppermint oil or its compounds affect blood pressure and cardiovascular health?
Several studies have examined the cardiovascular effects of peppermint oil or its active components, with results suggesting a potential for blood pressure reduction and cardiometabolic benefits. However, the magnitude and consistency of these effects vary across study populations, dosages, and methodologies.
- Peppermint oil supplementation (both 50 µL and 100 µL doses) has shown reductions in blood pressure and improvements in cardiometabolic health in randomized and non-randomized studies 1 4.
- Menthol, a major component of peppermint, may contribute to vasorelaxation and antihypertrophic effects through mechanisms involving calcium channels and TRPM8 receptors 5.
- Some studies using aromatherapy or inhalation found no significant effects or even slight increases in systolic blood pressure, suggesting that delivery method may influence outcomes 3.
- The new study adds to a small but growing body of randomized controlled trials, strengthening the evidence for peppermint oil's potential cardiovascular benefits 4 5.
How do natural and non-pharmacological therapies compare with traditional hypertension treatments?
The broader literature on hypertension management highlights a growing interest in herbal and lifestyle interventions as alternatives or adjuncts to conventional medications. Evidence indicates some natural therapies can lower blood pressure, but calls for more rigorous trials remain.
- Herbal remedies, including peppermint, are widely used due to their accessibility and perceived safety, but robust clinical data are still limited 6 8 9 10.
- Systematic reviews and meta-analyses consistently identify dietary changes (particularly the DASH diet), aerobic exercise, and other lifestyle modifications as effective strategies for lowering blood pressure, often with similar or greater effects than single herbal interventions 7 12 13.
- Non-pharmacologic interventions are especially important in resource-limited settings or for patients who experience medication side effects 6 7.
- The new study provides additional evidence for peppermint oil as a low-cost, well-tolerated option, but does not address long-term efficacy or comparisons with established lifestyle therapies 4 7 12.
What are the broader metabolic or psychological effects of peppermint and similar interventions?
Related research has explored the metabolic and psychological impacts of peppermint, as well as its role in exercise performance and well-being. While some benefits are reported, findings are often based on small or non-randomized studies.
- Peppermint ingestion has been linked to improvements in exercise performance, respiratory function, and select metabolic parameters (e.g., glycemia, cholesterol, BMI) 1 2 4.
- Some studies report improvements in sleep quality and reductions in fatigue with peppermint aromatherapy, though effects on blood pressure were inconsistent or even slightly adverse 3.
- There is preliminary evidence that peppermint oil may reduce anxiety and improve mental well-being, but these findings require confirmation in larger, well-controlled trials 4.
- The current study's inclusion of mental well-being and sleep quality as outcomes reflects a trend toward holistic assessment of cardiovascular interventions 4.
Future Research Questions
While this new research provides promising evidence for peppermint oil as a potential adjunct therapy for mild hypertension, further studies are needed to clarify its mechanisms, long-term safety, and comparative effectiveness. Key areas for future investigation include optimal dosing, duration of effect, and applicability to diverse populations.
| Research Question | Relevance |
|---|---|
| What are the long-term effects of daily peppermint oil supplementation on blood pressure? | Most studies, including the new RCT, are short-term; long-term efficacy and safety data are lacking for sustained use in managing hypertension 4 6 7. |
| How does peppermint oil compare to other non-pharmacological interventions for hypertension? | Comparative studies are needed to determine whether peppermint oil is as effective as established lifestyle interventions such as DASH diet, exercise, or breathing exercises 7 12 13. |
| What are the mechanisms by which peppermint oil lowers blood pressure? | Understanding the biological pathways, such as menthol’s effects on vascular function, could inform dosing and safety and help identify which patients may benefit 5 8. |
| Does peppermint oil have differential effects by age, gender, or hypertension severity? | Subgroup analyses could clarify if certain populations respond more favorably or experience different side effects, as current studies have small, homogeneous samples 4 13. |
| Is peppermint oil safe and effective when combined with antihypertensive medications? | Most current research excludes individuals on antihypertensive drugs, so potential interactions, additive effects, or safety concerns remain unknown 6 8 9. |