Home/Ingredients/Grape Seed Extract (OPCs)

ING-142Ingredient Research Profile

Cardiovascular

Grape Seed Extract (OPCs)

Also known as: Oligomeric proanthocyanidins · OPCs · Vitis vinifera extract · Pycnogenol (pine bark)

●●○Moderate Evidence

Oligomeric proanthocyanidins from grape seeds reduce blood pressure, improve vascular function, and reduce oedema. Among the most potent plant polyphenol antioxidants.

Effective Dose

100–400mg / day

per clinical evidence

Evidence Level

Moderate

Cardiovascular

Mechanism

OPC antioxidant, eNOS activation, collagen cross-link inhibition, platelet inhibition

primary action

Best For

Blood pressure

Vascular health, Oedema, Antioxidant

This profile is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications.

What Is Grape Seed Extract (OPCs)?

Grape seed extract is standardised for oligomeric proanthocyanidins (OPCs) — a class of polyphenols with extremely high antioxidant capacity (ORAC ~20,000 — more than vitamin C or E). They protect blood vessel walls from oxidative damage, activate eNOS, and inhibit collagen-degrading enzymes.

How It Works: The Science

OPCs inhibit collagen-degrading enzymes (collagenase, elastase, hyaluronidase) that break down vascular connective tissue, improving vessel wall integrity. They activate eNOS (increasing NO, vasodilating arteries), inhibit ACE (reducing blood pressure), and scavenge superoxide radicals that would otherwise quench NO. Platelet aggregation is also reduced via thromboxane inhibition.

Primary Mechanism

OPC antioxidant, eNOS activation, collagen cross-link inhibition, platelet inhibition

Evidence-Based Benefits

Reduces blood pressure in hypertensive adults

moderate

Feringa et al. (2011) meta-analysis — significant reductions in SBP and DBP

Reduces peripheral oedema and heavy-leg syndrome

moderate

Multiple European RCTs — venous insufficiency symptom improvement

Improves skin elasticity and reduces UV damage

moderate

Multiple RCTs — improved skin hydration, elasticity, and reduced UV-induced oxidative damage

Dosage Guide

Effective Dose

100–400mg / day

100–400mg/day of standardised extract (≥95% OPCs). Pine bark extract (Pycnogenol) provides similar OPCs via a slightly different phytochemical profile — both are effective.

Safety Profile & Side Effects

Excellent safety profile. May mildly inhibit platelet aggregation — caution with anticoagulants. Very well tolerated with long-term use.

Who Should (and Shouldn't) Take It

Best for

Blood pressureVascular healthOedemaAntioxidant

Who it's for

Those with hypertension, chronic venous insufficiency, varicose veins, those wanting skin antioxidant protection, and anyone seeking a high-potency plant polyphenol antioxidant.

Frequently Asked Questions

What is the recommended dose of Grape Seed Extract (OPCs)?

100–400mg/day of standardised extract (≥95% OPCs). Pine bark extract (Pycnogenol) provides similar OPCs via a slightly different phytochemical profile — both are effective.

Is Grape Seed Extract (OPCs) safe?

Excellent safety profile. May mildly inhibit platelet aggregation — caution with anticoagulants. Very well tolerated with long-term use.

How does Grape Seed Extract (OPCs) work?

Who should take Grape Seed Extract (OPCs)?

Those with hypertension, chronic venous insufficiency, varicose veins, those wanting skin antioxidant protection, and anyone seeking a high-potency plant polyphenol antioxidant.

Related Ingredients

Pomegranate Extract Hawthorn Berry Extract Omega-3 (EPA + DHA)Curcumin (with Bioperine / Phytosome)

Medical Disclaimer

Ingredient profiles are for informational purposes only and do not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications. Full disclaimer →