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Grape seed extract & Pycnogenol

Proanthocyanidins (OPCs) for blood vessels — grape seed edges out pine bark for blood pressure.

Reviewed by Bodil Isaksson, Licensed Biomedical Scientist (Sweden)Last reviewed July 2026Supplement guide

SupplementsAntioxidantsHeartCirculation

Both grape seed extract and Pycnogenol (French maritime pine bark) are rich in oligomeric proanthocyanidins (OPCs) — flavonoid antioxidants marketed for circulation, blood pressure and skin.

Key takeaways

  • Both are OPC-rich flavonoid extracts with antioxidant and blood-vessel effects.
  • Grape seed extract lowered blood pressure in pre-/mild hypertension, more so at higher doses (~300–400 mg/day).1
  • Pycnogenol’s blood-pressure evidence is weaker/mixed in meta-analysis.2
  • Pycnogenol has notable skin evidence: 12 weeks improved skin elasticity & hydration (with more collagen & hyaluronic-acid gene expression) and reduced melasma/pigmentation.3
  • Also studied for venous insufficiency and circulation; generally safe.

What it is

OPCs (proanthocyanidins) are the tannin-like flavonoids concentrated in grape seeds and pine bark. They support nitric-oxide-mediated blood-vessel function and are strong antioxidants.

The evidence

Grape seed extract improved endothelial function and reduced blood pressure in people with pre-/mild hypertension, with the clearest effect at higher doses.1 For Pycnogenol, a meta-analysis found no significant blood-pressure benefit, though it has other circulation and skin research.2

Skin health (Pycnogenol)

Pycnogenol has a distinct — and fairly persuasive — body of research for skin, one of its strongest areas.

Elasticity & hydrationA 12-week study in women (55–68) found Pycnogenol improved skin elasticity and hydration, alongside a ~40% rise in collagen type I and ~44% rise in hyaluronic-acid synthase gene expression in skin biopsies.3
Pigmentation / melasmaIn women with melasma, oral Pycnogenol reduced pigmentation over 12 weeks.4
Photoaging & UVIt also shows photoprotective effects and, by curbing collagen- and elastin-degrading enzymes, may limit photoageing.3
Dose (skin)Skin trials typically use ~75–100 mg/day for 8–12 weeks.

Dose & how to use

Grape seed extract 150–400 mg/day of standardised OPCs; Pycnogenol commonly 50–150 mg/day.

Safety & who benefits

Generally well tolerated. Of interest for blood pressure and circulation (grape seed first) and venous/skin support.

Bottom line: grape seed OPCs have a real (dose-dependent) blood-pressure signal; Pycnogenol is pricier with weaker BP evidence — both are safe adjuncts, not treatments.

References

Adult research summary for education, not a prescription. These are food supplements, not treatments for disease.

  1. Effects of Grape Seed Proanthocyanidin Extract on Vascular Endothelial Function in Prehypertension: a randomised, double-blind, placebo-controlled study. pmc.ncbi.nlm.nih.gov
  2. Effect of Pycnogenol on Blood Pressure: a systematic review and meta-analysis of RCTs. 2019. pubmed.ncbi.nlm.nih.gov
  3. Pycnogenol (French maritime pine bark extract) in randomized, double-blind, placebo-controlled human clinical studies — review incl. skin elasticity/hydration & collagen/HAS. pmc.ncbi.nlm.nih.gov
  4. Ni Z, et al. Treatment of melasma with Pycnogenol. Phytother Res 2002. pubmed.ncbi.nlm.nih.gov

This article summarises nutrition science for education. It is not a substitute for individual medical advice; consult a professional before starting a supplement, in pregnancy, or alongside medication.