Big effect
Morning systolic BP dropped by 5.4 mmHg in a 12-week trial of 300 mg/day potassium combined with olive leaf extract — but the effect came from a two-ingredient mix, not potassium alone.
This is the first indexed study testing this specific combination, so while the 5.4 mmHg drop is a solid effect for a supplement, it's too early to tell how much of that credit belongs to potassium versus the olive leaf extract, or whether the benefits would hold in a larger, more diverse group.
In a 12-week double-blind trial of 70 adults with mild to moderate hypertension, a daily combination of 300 mg potassium and olive leaf extract lowered morning systolic blood pressure by 5.4 mmHg compared to placebo. The same combination also improved cholesterol, triglycerides, insulin sensitivity, and markers of oxidative stress — but because the study tested a mix, not potassium alone, you can't assume plain potassium supplements would produce the same results.
Where this fits in the evidence
This is among the first studies we've indexed on Potassium for Reduced Systolic Blood Pressure — treat it as an early signal until more research accumulates.
The study
- Randomized Controlled Trial (RCT)
- n = 70
- 2026-06
- Phytomedicine : international journal of phytotherapy and phytopharmacology
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.