What it’s for
- Studied for blood-pressure effects
An extract containing grape-seed polyphenols, commonly sold in capsules.
Purpose, evidence and practical considerations.
Small, short trials suggest modest effects on some cardiovascular markers. Preparations vary, and evidence does not establish prevention of cardiovascular events.
Confidence: weak
Short studies generally report mild adverse effects, but long-term safety is less certain. Grape seed extract may affect bleeding or blood pressure and can interact with anticoagulant, antiplatelet or antihypertensive therapy.
Proanthocyanidins have antioxidant and vascular effects in laboratory models. Small human trials suggest possible modest blood-pressure effects, but the clinical mechanism and product equivalence remain uncertain.
Regulatory status: dietary supplement ingredient; not an FDA-approved treatment for hypertension or cardiovascular disease
The evidence on this page does not automatically apply to:
How people use it, with their schedules, context and original sources.
a little bit · with first meal
Amount and timing patterns reported in public protocols; these are observations, not instructions. Private and hidden usage is excluded.
These share a protocol with this intervention. This does not establish that they work together or are suitable alternatives.