Olive leaf extract plus potassium showed a home blood pressure signal
A placebo-controlled trial reported a greater home blood pressure response with the combination, while office readings fell in both groups and several other measures stayed unchanged.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The combination showed a greater reduction in morning blood pressure measured at home, while clinic measurements fell in both groups. Some blood fat and insulin-related markers also improved, but fasting glucose, HbA1c and quality-of-life scores did not change. These results concern a combined supplement and measured risk markers, rather than demonstrated prevention of cardiovascular events.
The abstract does not clearly separate changes within the supplement group from differences versus placebo for most markers. The combination design cannot identify the separate contribution of either ingredient.
What researchers found
Morning systolic blood pressure measured at home
Combination versus placebo in a 12-week trial; the abstract does not clarify the exact timepoint or size of the between-group difference.
Measurement setting matters
Home monitoring and clinic readings gave different patterns. The abstract reports a greater response with the combination at home, but its description does not clearly quantify the difference between groups.
Safety and broader outcomes
No serious adverse events attributed to the product were reported. Global self-ratings favoured the supplement, although quality-of-life scores stayed stable; this mixed pattern does not establish an improvement in everyday functioning.
The original publication
Effects of a combination of olive leaf extract and potassium on blood pressure in participants with mild to moderate hypertension: A double blind, randomized, placebo-controlled trial.
Fladerer-Grollitsch JP, Bucar F, Klein T et al.
Phytomedicine · 2026
- PubMed ID
- 41935461
- Record checked
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