Last verified: 17 days ago
Grape Seed Extract
Also known as: GSE, Vitis vinifera seed extract, oligomeric proanthocyanidins, OPCs, procyanidins
Evidence under review. — Not yet rated
Plant antioxidant with early evidence for mild blood pressure reduction. Most other claims lack strong human trial support.
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What it does
Grape seed extract (GSE) is a concentrated source of plant compounds called oligomeric proanthocyanidins (OPCs), derived from grape seeds. Early clinical evidence suggests it may modestly reduce...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose from provided studies
What the Science Says
Grape seed extract (GSE) is a concentrated source of plant compounds called oligomeric proanthocyanidins (OPCs), derived from grape seeds. Early clinical evidence suggests it may modestly reduce diastolic blood pressure and mean arterial pressure in people with elevated or stage 1 hypertension, likely by promoting peripheral vasodilation. It has also been explored in dental applications as a pulpotomy dressing material with results comparable to standard treatments, and shows anti-inflammatory and antioxidant activity in lab and animal studies.
What It Doesn't Do
Not proven to treat or prevent cancer — a combination supplement trial in glioblastoma patients showed no significant survival benefit. No strong evidence it meaningfully lowers cholesterol on its own. Not shown to improve heart rate, stroke volume, or cardiac autonomic function. Animal and lab findings don't automatically translate to human benefits. Not a substitute for blood pressure medication.
Evidence-Based Benefits
May modestly reduce diastolic blood pressure in adults with elevated or stage 1 hypertension.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Performs comparably to standard MTA as a pulpotomy dressing in primary teeth over 6 months.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
A single low dose after delivery may help reduce postpartum blood loss compared to placebo.
Weak EvidenceEffective at: 20 mg single dose
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — no pharmacokinetic data provided in the supplied studies
Red Flags to Watch For
- Most provided studies are small (as few as 10 participants), limiting reliability of findings
- Several papers involve animal models or in vitro (lab) experiments, which may not apply to humans
- The cancer-related trial used a multi-ingredient formula, so GSE's individual contribution cannot be isolated
- No consistent dosing standard exists across the provided human studies
- Some studies used GSE via intramuscular injection in sheep — not applicable to oral supplement use
Products Containing Grape Seed Extract
See how Grape Seed Extract is used in these analyzed products:
Theralogix Berberine Enhanced Absorption
Supplement
Halo Beauty Hair Skin Nails Booster
Supplement
Nature Made Berberine Phytosome Capsules
Supplement
DrBioCare Collagen Peptides for Women
Supplement
ADAM™ Men's Multiple Vitamin
Supplement
Nitro Wood™ Magnum
Supplement
Thorne Berberine
Supplement
Life Extension Mix Capsules
Supplement
Brain Defender
Supplement
Frequently Asked Questions
What does Grape Seed Extract do?
Plant antioxidant with early evidence for mild blood pressure reduction. Most other claims lack strong human trial support.
What is the effective dose of Grape Seed Extract?
No established dose from provided studies
Is Grape Seed Extract safe?
Most provided studies are small (as few as 10 participants), limiting reliability of findings
What doesn't Grape Seed Extract do?
Not proven to treat or prevent cancer — a combination supplement trial in glioblastoma patients showed no significant survival benefit.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25