French Maritime Pine Bark Extract (Pycnogenol): Benefits, Dosage & Side Effects

French maritime pine bark extract — best known by the brand name Pycnogenol — turns up in circulation formulas, men's health products and brain-support tonics alike. That versatility makes it easy to oversell. Here's what it is, which benefits have real research behind them, how much people take, and the side effects worth knowing.

What is French maritime pine bark extract?

It's an extract from the bark of the maritime pine (Pinus pinaster), grown in the forests of southwestern France. Its active compounds are procyanidins (also called OPCs) — the same family of antioxidants found in grape seeds, cocoa and apples. Pycnogenol is a trademarked, standardized version of the extract, and most clinical studies use it; generic "pine bark extract" may differ in strength.

How it works

Pine bark procyanidins act as antioxidants and appear to support the production of nitric oxide by the lining of blood vessels (the endothelium). Better endothelial function means blood vessels relax and widen more easily — which explains why circulation is the common thread running through most of its research.

Benefits: what the research says

• Circulation and vein health — best supported. Several trials in people with chronic venous insufficiency report less leg swelling, heaviness and discomfort.
• Blood pressure and blood vessels — modest. Small studies show improvements in endothelial function and slight blood-pressure reductions.
• Men's sexual health — promising combination. In small trials, men with mild to moderate erectile dysfunction improved when Pycnogenol was taken together with L-arginine. Evidence for pine bark alone is weaker.
• Memory and focus — early. A handful of small trials in older adults and students report modest improvements in memory or attention.
• Skin — early. Small studies suggest improvements in hydration and elasticity.

For balance: a 2020 Cochrane review looked at pine bark extract across many chronic conditions and concluded that the evidence was too limited and low in quality to support its use for any of them. Promising, in other words, but not settled.

The circulation research is the real foundation; everything else is built on smaller, earlier studies.

How much do people take?

Most clinical studies used between 50 and 200 mg a day of standardized extract, often split into two doses and taken with food. In combination formulas — especially liquid "tonics" — the amount is often undisclosed, which makes it hard to know whether you're getting a research-level dose.

Side effects and interactions

• Common, usually mild: stomach upset (taking it with food helps), dizziness and headache.
• Blood thinners: pine bark may reduce platelet clumping, so combine it with anticoagulants or antiplatelet drugs only under medical advice, and stop before surgery.
• Diabetes medication: it may lower blood sugar slightly.
• Immunosuppressants and autoimmune conditions: it may stimulate immune activity.
• Pregnancy: safety data is limited, so it's best avoided.

Supplements we've reviewed that contain pine bark

Two brain-support liquids in our lineup include French maritime pine bark alongside Lion's Mane, Bacopa and ginkgo: Pineal Guardian (3.8/5) and NeuroPrime XT (3.6/5). Neither discloses the pine bark dose, and both lean on a "pineal detox" story we don't find credible — judge them on the overall ingredient list instead.

For men interested in the arginine angle, Spartamax doesn't contain pine bark, but it pairs L-arginine with grape seed extract — a close cousin rich in the same procyanidins. For the full memory picture, see our guide to memory supplement ingredients after 50.

Frequently asked questions