Big effect
Lemon balm dropped systolic blood pressure by 8 mmHg in a four-week trial — but only in people already diagnosed with stage 1 hypertension.
This is a promising early signal from a well-designed triple-blind trial, but with only 105 participants and no prior studies on this exact pairing, the finding needs replication before you should act on it.
In a randomized, triple-blind trial of 105 people with stage 1 hypertension, those who took 10 mL of lemon balm extract daily for four weeks saw their systolic blood pressure drop by an average of 8 mmHg — a moderate, statistically significant reduction. Diastolic pressure also fell significantly. However, because this is among the first studies to test lemon balm specifically for blood pressure, and the effect was measured only in a clinical population over a short period, the results may not apply to everyone.
Where this fits in the evidence
Pillser has synthesized 3 studies on Lemon Balm for Reduced Systolic Blood Pressure — overall evidence strength: Moderate.
Across 3 studies, all reported beneficial effects on systolic blood pressure, with effect sizes ranging from moderate to large; the predominant effect size was moderate. Effects were observed after 28 days of supplementation in hypertensive populations. The evidence base is small but consistent.
The study
- Randomized Controlled Trial (RCT)
- n = 105
- 2025-12
- Complementary therapies in medicine
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.