Grape Seed Extract
Cardiovascular
Also known as: OPC, Proanthocyanidins
B
Grade B💊 100-300mg standardized extract🎯 4 primary uses🔗 3 synergies⚠️ Review warnings
Levels upVitality+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
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
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
Tags
cardiovascularOPCcirculationantioxidant
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.
Last reviewed: June 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, June). 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.