What is Pycnogenol?
Pycnogenol is a standardized extract derived from the bark of the French maritime pine (Pinus pinaster Ait. subsp. atlantica) that contains 65-75% procyanidins (polymers of catechin and epicatechin), along with polyphenolic monomers, phenolic acids, and cinnamic acid derivatives 1, 2.
Chemical Composition and Bioavailability
The extract's quality is specified in the United States Pharmacopeia (USP 28) 1. The procyanidins range from monomeric catechin and taxifolin to oligomers containing 7 or more flavonoid subunits 2. Key components include:
- Procyanidins (65-75%): Biopolymers of catechin and epicatechin subunits
- Phenolic acids: Derivatives of benzoic and cinnamic acids
- Bioflavonoids: Including catechin and taxifolin
The components are highly bioavailable in humans. Ferulic acid and taxifolin are rapidly absorbed and excreted as glucuronides or sulfates, while procyanidins are absorbed more slowly and metabolized to valerolactones that are excreted as glucuronides 2.
Mechanism of Action
Pycnogenol exhibits synergistic effects—the mixture demonstrates greater biological activity than its purified individual components 1, 3. Its primary mechanisms include:
- Antioxidant activity: Strong free radical scavenging against reactive oxygen and nitrogen species, doubling intracellular synthesis of antioxidant enzymes 2, 3
- Vascular effects: Antagonizes vasoconstriction by increasing endothelial nitric oxide synthase activity 4, 2
- Anti-inflammatory properties: Demonstrated both in vitro and in vivo 2
- Collagen stabilization: Important for vascular integrity 5
Clinical Applications
Research demonstrates efficacy in several conditions:
Cardiovascular and Metabolic Effects
A 2025 meta-analysis of 27 RCTs (1,685 participants) showed significant reductions in systolic blood pressure (-2.26 mmHg), diastolic blood pressure (-2.62 mmHg), fasting blood sugar (-6.25 mg/dL), HbA1c (-0.32%), body weight (-1.37 kg), and LDL cholesterol (-5.07 mg/dL) 6.
Venous Disorders
Clinical studies demonstrate effectiveness in chronic venous insufficiency, reducing leg edema, decreasing deep vein thrombosis incidence during long flights, and enhancing healing of venous ulcers and hemorrhoids 5.
Endothelial Function
In healthy young men, 180 mg/day for 2 weeks augmented endothelium-dependent vasodilation through increased nitric oxide production 4.
Other Applications
- ADHD: Reduced inattention and impulsivity symptoms in children while improving antioxidative status 7
- Hair loss: Increased hair density by 30% after 2 months in menopausal women 8
Safety Profile
Pycnogenol has low acute and chronic toxicity, with mild unwanted effects occurring in only a small percentage of patients following oral administration 2.