Grape Seed Extract

Cardiovascular

Also known as: OPC, Proanthocyanidins

Grade B

💊 100-300mg standardized extract🎯 4 primary uses🔗 3 synergies⚠️ Review warnings

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Levels upHeart & Longevity+50 pts

Overview

Rich in OPCs for vascular health. Strengthens capillaries and supports circulation.

Primary Uses

Vascular healthCirculationAntioxidantBlood pressure

Frequently Asked About Grape Seed Extract

How much Grape Seed Extract should I take?

The typical effective range is 100-300mg standardized extract. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.

When is the best time to take Grape Seed Extract?

Any time. Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.

Should I take Grape Seed Extract with food?

Optional.

Does Grape Seed Extract interact with medications?

Yes — known interactions include Blood thinners (mild) and NSAIDs. If you take any prescription medication, talk to your doctor or pharmacist before starting Grape Seed Extract.

What does Grape Seed Extract pair well with?

Grape Seed Extract stacks well with Vitamin C, Pycnogenol, and Horse chestnut — these combinations either improve absorption or work synergistically toward common goals.

Who should not take Grape Seed Extract?

Grape Seed Extract should be avoided or used with caution by people with None. Pregnant or breastfeeding women should consult a healthcare provider before use.

What are the side effects of Grape Seed Extract?

Most people tolerate Grape Seed Extract well. The most commonly reported side effects are Rare. Side effects are usually dose-dependent — lowering the dose often resolves them.

Dosage

Typical range

100-300mg standardized extract

Timing

Any time

With food

Optional

Duration

Ongoing

Special Populations

Circulation, venous insufficiency, eye health

Research & Studies

Search the literature now

We haven’t curated landmark studies for Grape Seed Extractyet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.

Search Grape Seed Extract research

PubMed (RCTs) ↗Randomized trials PubMed (all) ↗Full literature Cochrane Reviews ↗Systematic reviews Examine.com ↗Research summaries

Browse all curated studies →

Mechanism of Action

• Strengthens capillaries
• Potent antioxidant
• Supports endothelial function

Evidence Quality

Evidence Grade B

OPC-rich vascular support

Safety & Contraindications

Serious Warnings

• None

Contraindications

• None

Common Side Effects

• Rare

Pregnancy & Breastfeeding

Consult healthcare provider

Liver & Kidney Notes

Safe

Interactions

💊 Medications

• Blood thinners (mild)
• NSAIDs

🧪 Supplements

• Works with vitamin C

🍽️ Food & Alcohol

• No interactions

Stacking & Synergies

Pairs Well With

Vitamin C ↗Pycnogenol ↗Horse chestnut ↗

Avoid Combining With

None

Best Goal Synergies

CirculationCapillary health

Buying Guide

What to Look For

• Standardized to OPCs
• 95% common

Standardization Markers

OPC/proanthocyanidin content (95%)

Adulteration risk

Low

Practical Notes

• Synergy with vitamin C
• Good for leg circulation

More in Cardiovascular

Other ingredients in the Cardiovascular category.

Beet

Beet root powder is derived from the root of Beta vulgaris and contains bioactive compounds including betalains and nitrates, which may support cardiovascular function and exercise performance. Evidence supports benefits for blood pressure regulation and endothelial function, particularly in nitrate-sensitive contexts.

Butcher's Broom

Traditional remedy for poor circulation and venous health. Supports leg circulation.

Diosmin/Hesperidin

Citrus flavonoids for venous and lymphatic health. Popular in Europe for vein support.

Ginkgo Biloba (Circulation Focus)

Improves microcirculation, especially to extremities and brain. Traditional circulation herb.

Horse Chestnut Extract

Horse chestnut extract, standardized to escin, is traditionally used to support venous circulation and reduce symptoms of chronic venous insufficiency. Multiple clinical trials support its efficacy for reducing leg swelling, heaviness, and pain related to venous dysfunction.

Browse all Cardiovascular ingredients →

Last reviewed: September 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.

Cite this page

Formulate Research Team. (2026, September). Grape Seed Extract — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/grape-seed-extract

Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.