Pycnogenol is a plant extract from the bark of the French maritime pine tree, and it has a surprisingly broad range of studied health benefits. It’s best supported by evidence for improving blood pressure, blood sugar control, joint pain, and circulation. A 2025 meta-analysis of 27 clinical trials found it significantly reduced systolic blood pressure, fasting blood sugar, LDL cholesterol, and body weight compared to placebo groups.
What Pycnogenol Actually Is
Pycnogenol is a patented, standardized extract from the bark of Pinus pinaster, a pine tree native to the coast of southwest France. Its active ingredients are a blend of plant compounds called flavonoids, including catechin, epicatechin, taxifolin, and a group of potent antioxidants known as procyanidins. It also contains phenolic acids like ferulic acid and caffeic acid. These compounds work together primarily as antioxidants and anti-inflammatory agents, which explains why the extract shows up in research across so many different health conditions.
Blood Pressure and Heart Health
The strongest body of evidence for Pycnogenol involves cardiovascular risk factors. The 2025 meta-analysis published in BMC Complementary Medicine and Therapies pooled data from 1,685 participants across 27 randomized controlled trials. The results showed that Pycnogenol supplementation lowered systolic blood pressure by about 2.3 mmHg and diastolic blood pressure by about 2.6 mmHg on average. It also reduced LDL (“bad”) cholesterol by roughly 5 mg/dL.
Those numbers might sound modest, but population-level reductions in blood pressure of even 2 to 3 mmHg are associated with meaningful drops in stroke and heart disease risk over time. In one earlier crossover study, people with mild hypertension who took 200 mg daily saw their systolic blood pressure drop from an average of 140 to about 133 mmHg over eight weeks. The effect on diastolic pressure in that particular study didn’t reach statistical significance, but the larger meta-analysis confirmed a real effect on both numbers when trials were pooled together.
The same meta-analysis found no significant effect on total cholesterol, HDL cholesterol, triglycerides, or insulin levels. So Pycnogenol doesn’t appear to improve every metabolic marker, but it does target several of the most important ones.
Blood Sugar and Metabolic Health
For people managing blood sugar, Pycnogenol shows consistent benefits across multiple studies. The pooled data found it reduced fasting blood sugar by about 6.25 mg/dL and lowered HbA1c (a measure of average blood sugar over two to three months) by 0.32%. A reduction of that size in HbA1c is clinically relevant, roughly comparable to what some people achieve with early lifestyle interventions. The meta-analysis also found a modest but significant reduction in body weight of about 1.4 kg (roughly 3 pounds), though it had no effect on BMI or waist circumference.
Animal research has shown that Pycnogenol helps protect the liver from oxidative damage caused by chronically high blood sugar, with treated subjects showing improved glycogen storage and better glucose tolerance after meals. These findings suggest the extract works partly by reducing the oxidative stress that high blood sugar creates in tissues, not just by lowering the sugar itself.
Joint Pain and Osteoarthritis
One of the most impressive single-study findings for Pycnogenol involves knee osteoarthritis. In a clinical trial measuring outcomes on the WOMAC scale (a standard tool for assessing joint pain, stiffness, and physical function), participants taking Pycnogenol for 90 days reported a 43% reduction in pain, a 35% reduction in stiffness, and a 52% improvement in physical function. Their overall composite score improved by 49%. The placebo group showed no significant changes during the same period.
These are substantial improvements for a supplement. The anti-inflammatory properties of the procyanidins in the extract likely drive this effect, reducing the chronic low-grade inflammation that makes osteoarthritis progressively worse. For people with mild to moderate knee arthritis, this is one of the better-studied natural options available.
Circulation and Venous Health
Pycnogenol has been used in clinical settings for chronic venous insufficiency, a condition where blood pools in the legs due to weakened vein valves. This causes swelling, heaviness, and sometimes visible varicose veins. Studies in this area have used higher doses, typically 150 to 360 mg per day, reflecting the greater severity of the condition being treated. The procyanidins in the extract help strengthen blood vessel walls and improve blood flow, which is why it’s particularly well suited to circulatory problems.
Attention and Focus in Children
A randomized trial involving 88 children with ADHD (average age 10) compared Pycnogenol to both a standard ADHD medication and placebo over 10 weeks. Teachers reported significant improvement in overall ADHD symptoms and hyperactivity/impulsivity scores for children taking Pycnogenol, similar to the pattern seen with the medication group. The medication group also showed additional improvement in inattention specifically. This is a single study and not enough to position Pycnogenol as a replacement for established ADHD treatments, but it suggests the extract may support attention and impulse control in ways that warrant further investigation.
Typical Dosages Across Studies
The dosage used in clinical research varies by condition. For general cardiovascular and metabolic benefits, most studies use 100 to 200 mg per day. Asthma studies typically use 100 mg daily. Menopause-related research has used 120 to 200 mg daily for durations ranging from 2 to 24 weeks. Venous insufficiency requires higher doses, up to 360 mg per day. Most benefits in the research appear after consistent use for at least 4 to 8 weeks, so this isn’t something that works overnight.
Safety and Interactions
Pycnogenol is generally well tolerated in the doses used in clinical trials. The most important safety concern involves blood thinning. Because the extract inhibits platelet aggregation (the clumping of blood cells that forms clots), it can increase bleeding risk if you’re taking anticoagulant or antiplatelet medications like warfarin. If you’re on blood thinners, this interaction is worth discussing with your prescriber before starting supplementation.
People with a known allergy to pine bark should avoid it entirely. Beyond that, side effects in clinical trials have been mild, and the extract has a long safety track record in European use. That said, the research showing metabolic and cardiovascular benefits positions Pycnogenol as a complementary strategy alongside other health measures, not as a standalone treatment for any serious condition.