Grape Seed Extract

Also known as: GSE, proanthocyanidins, OPC, vitis vinifera

Grade B — Moderate Evidenceantioxidantcardiovascular
100–300 mgWith meals

Grape seed extract is rich in oligomeric proanthocyanidins (OPCs) that exhibit potent antioxidant activity and support vascular integrity by strengthening collagen cross-links in blood vessel walls. Meta-analyses demonstrate significant reductions in systolic blood pressure and heart rate, with additional evidence for reducing leg swelling (chronic venous insufficiency) and improving endothelial function. OPCs also enhance vitamin C activity and protect against UV-induced skin damage.

TL;DR: Rich source of proanthocyanidins (OPCs) with strong antioxidant activity. Evidence for blood pressure reduction, skin protection, and vascular health. Well-tolerated with few side effects.

❤️Heart Health✨Skin & Hair🧬Longevity
Last reviewed: 2026-03-12

Quick Facts

Evidence

Grade B

Studies

2

Interactions

2

Forms

1

Evidence Rating: Grade B — Moderate Evidence

Some RCTs with positive results, or strong observational evidence. More research may refine our understanding.

Interaction Warnings

Blood thinnersModerate

Proanthocyanidins may inhibit platelet aggregation — use caution with anticoagulants.

Blood pressure medicationsLow

Additive blood pressure lowering effect.

Important Notes

  • High in proanthocyanidins — different from grape seed oil
  • Well-tolerated at standard doses
  • Standardized to 95% proanthocyanidins for best results

Clinical Evidence (2 studies)

Grape seed extract and blood pressure: meta-analysis

Zhang H et al. (2016) — Medicine

Grape seed extract significantly reduced systolic blood pressure by 6.08 mmHg in metabolic syndrome and pre-hypertensive subjects

View on PubMed

Proanthocyanidins for skin photoprotection

Yamakoshi J et al. (2004) — Phytother Res

GSE reduced UV-induced pigmentation and improved skin elasticity over 6 months

View on PubMed

Alternatives to Consider

These supplements target similar goals and may be worth considering alongside or instead of Grape Seed Extract.

Pycnogenol

Grade B

Patented French maritime pine bark extract with 400+ published studies. Evidence for cognitive function, cardiovascular health, and skin aging. Contains procyanidins similar to grape seed extract.

❤️ Heart Health✨ Skin & Hair🧬 Longevity

Vitamin E

Grade B

Fat-soluble antioxidant important for cell membrane protection, immune function, and skin health. Moderate doses (200-400 IU) appear safe and beneficial. High doses (>400 IU) linked to increased mortality risk in meta-analyses. Choose mixed tocopherols and natural forms.

🧬 Longevity❤️ Heart Health✨ Skin & Hair

CoQ10 (Ubiquinol)

Grade A

Critical for mitochondrial energy production. Q-SYMBIO trial showed 43% cardiovascular mortality reduction in heart failure. Depleted by statins.

❤️ Heart Health🧬 Longevity

Related Supplements

Pycnogenol

Grade B — Moderate Evidence

Patented French maritime pine bark extract with 400+ published studies. Evidence for cognitive function, cardiovascular health, and skin aging. Contains procyanidins similar to grape seed extract.

Vitamin E

Grade B — Moderate Evidence

Fat-soluble antioxidant important for cell membrane protection, immune function, and skin health. Moderate doses (200-400 IU) appear safe and beneficial. High doses (>400 IU) linked to increased mortality risk in meta-analyses. Choose mixed tocopherols and natural forms.

CoQ10 (Ubiquinol)

Grade A — Strong Evidence

Critical for mitochondrial energy production. Q-SYMBIO trial showed 43% cardiovascular mortality reduction in heart failure. Depleted by statins.

Vitamin C

Grade A — Strong Evidence

Essential antioxidant vitamin. Supports immune function, collagen synthesis, and antioxidant defense. 50% infection reduction in athletes.

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⚕️ Important Disclaimer

This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.

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