About Grape Seed Extract
Grape seed extract is rich in oligomeric proanthocyanidins (OPCs). Meta-analysis of 16 RCTs found significant blood pressure reduction (SBP -6.08, DBP -2.80 mmHg), especially in younger (<50), obese, and metabolic syndrome patients. A 50-trial meta-analysis found significant reductions in fasting glucose, total cholesterol, LDL, and triglycerides. Meta-analysis of 19 trials showed reduced oxidative stress markers (MDA) and hs-CRP. However, a smaller 9-trial meta-analysis found only modest BP effects and no lipid changes. Effect sizes are moderate and population-dependent. Products standardized to ≥95% OPCs reflect what was used in trials.
What Grape Seed Extract supports
- May reduce blood pressure by ~6 mmHg systolic
- Reduces oxidative stress markers
How much Grape Seed Extract to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
150–600
mg
Most RCTs use 150–300 mg/day. Typically standardized to ≥95% oligomeric proanthocyanidins (OPCs).
Clinical evidence
Moderate clinical evidence. Meta-analyses of 16-50 trials show significant blood pressure and cholesterol improvements
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