Last verified: 17 days ago
Grapeseed Extract
Also known as: GSE, Vitis vinifera seed extract, FRGSE, proanthocyanidins, OPC, oligomeric proanthocyanidins
Evidence under review. — Not yet rated
Antioxidant-rich plant extract with early evidence for heart and gum health, but most human data is limited.
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What it does
Grapeseed extract is a concentrated source of plant compounds called proanthocyanidins and flavanols, derived from grape seeds. In human studies, a single dose reduced platelet stickiness in male...
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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
What the Science Says
Grapeseed extract is a concentrated source of plant compounds called proanthocyanidins and flavanols, derived from grape seeds. In human studies, a single dose reduced platelet stickiness in male smokers, suggesting a possible benefit for blood vessel health. When combined with other nutrients alongside professional dental treatment, it was associated with modest improvements in gum pocket depth and bleeding — though grapeseed extract was not tested alone in that context.
What It Doesn't Do
Not proven to treat seasonal allergies — a clinical trial found no benefit over placebo. No human evidence it protects your heart directly. The cardioprotective findings come from rat studies only. Don't expect it to work as a standalone treatment for any condition. Most marketing claims far outpace the actual human evidence.
Evidence-Based Benefits
A single dose reduced platelet stickiness in male smokers within hours of consumption.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
As part of a multi-nutrient supplement, may modestly improve gum pocket depth alongside professional dental treatment.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — no pharmacokinetic data provided in the available studies. Flavanols from similar plant sources are generally considered moderately absorbed.
Red Flags to Watch For
- Most products contain grapeseed extract as part of a multi-ingredient blend, making it impossible to isolate its specific effects
- The only human trial testing grapeseed extract alone (for allergies) found no benefit over placebo
- Cardioprotective evidence comes entirely from rat studies — not humans
- No standardized dose has been established across human clinical trials
- Studies on periodontal health used a multi-nutrient supplement, so grapeseed extract's individual contribution is unknown
Products Containing Grapeseed Extract
See how Grapeseed Extract is used in these analyzed products:
Frequently Asked Questions
What does Grapeseed Extract do?
Antioxidant-rich plant extract with early evidence for heart and gum health, but most human data is limited.
What is the effective dose of Grapeseed Extract?
No established dose
Is Grapeseed Extract safe?
Most products contain grapeseed extract as part of a multi-ingredient blend, making it impossible to isolate its specific effects
What doesn't Grapeseed Extract do?
Not proven to treat seasonal allergies — a clinical trial found no benefit over placebo.
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