Pine Bark (Pycnogenol)
TL;DR
Patented extract from French maritime pine bark (Pycnogenol)
Rich in proanthocyanidins, similar compounds to grape seed extract
Good evidence for circulation, venous insufficiency, and cardiovascular health
Promising research for ADHD symptoms in children
Well-tolerated with extensive safety data
Best for: circulation problems, cardiovascular support, ADHD (with medical supervision)
What it is
Pine bark extract, most famously the patented Pycnogenol brand, comes from the bark of French maritime pine (Pinus pinaster). The extract contains high concentrations of oligomeric proanthocyanidins (OPCs), similar to those found in grape seed extract but with a slightly different profile of compounds. Pycnogenol has been extensively researched since the 1960s and has over 160 published studies.
The bioactive compounds work primarily through antioxidant mechanisms and effects on nitric oxide production, leading to improved blood flow and endothelial function. While Pycnogenol is the most studied form, other pine bark extracts contain similar compounds but lack the extensive research database of the patented version.
What the research says
Circulation and Venous Health
Pycnogenol shows strong evidence for improving circulation, particularly in people with chronic venous insufficiency. Multiple studies demonstrate reduced leg swelling, pain, and heaviness. A 2018 meta-analysis found significant improvements in venous function and reduced edema.
Blood Pressure and Cardiovascular Function
Several trials show modest blood pressure reductions with Pycnogenol, typically 5-10 mmHg systolic. More importantly, studies consistently show improvements in endothelial function and arterial stiffness. A 2019 study in people with mild hypertension found improved flow-mediated dilation and reduced inflammatory markers.
Platelet Function
Pycnogenol appears to reduce platelet aggregation and improve blood flow properties without significantly increasing bleeding risk in most people. [2]
ADHD Research
The most interesting cognitive research involves children with ADHD. A 2006 randomized controlled trial found significant improvements in hyperactivity, attention, and concentration compared to placebo. Follow-up studies have generally supported these findings, with typical doses of 1 mg per kg of body weight.
Adult Cognitive Effects
Limited research exists for adult cognitive enhancement. Some small studies suggest improved attention and working memory, but the evidence is preliminary. The theoretical mechanism involves improved cerebral blood flow, but this doesn't necessarily translate to meaningful cognitive benefits in healthy adults.
Limitations
Most cognitive research is in children, and studies are relatively small. More research is needed to establish whether benefits extend to adult cognitive decline or healthy cognitive enhancement. [1][3]
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Safety
Pine bark extract (Pycnogenol) has an excellent safety profile based on extensive clinical research. Side effects are rare and typically mild, including occasional stomach upset, headache, or dizziness. The extract has been used safely in studies lasting up to several years. However, some people may experience allergic reactions, particularly those sensitive to pine products.
Interactions
• Anticoagulants (warfarin, heparin) - May enhance blood-thinning effects, monitor carefully • Antiplatelet drugs (aspirin, clopidogrel) - Potential additive effects on bleeding time • Immunosuppressive drugs - Theoretical interaction due to immune-modulating effects • Diabetes medications - May affect blood sugar levels, monitor glucose
Dosing
Circulation/Cardiovascular: 100-200 mg daily of Pycnogenol or equivalent pine bark extract. Most studies used doses in this range.
ADHD (children): 1 mg per kg of body weight daily, typically given as a single dose with breakfast.
General Antioxidant: 50-100 mg daily may be sufficient for general health purposes.
Timing: Can be taken with or without food. Benefits typically appear after 4-8 weeks of consistent use.
Cost
Pycnogenol is one of the more expensive supplements, typically costing $35-60 monthly for effective doses. The high cost reflects the patented extraction process and extensive research. Generic pine bark extracts cost much less ($10-20/month) but lack the specific research validation of Pycnogenol.
The bottom line
Pine bark extract, particularly Pycnogenol, has solid research backing for circulation and cardiovascular health, making it one of the better-evidenced botanical supplements. The ADHD research in children is particularly intriguing. However, the high cost of Pycnogenol may limit its appeal, and it's worth considering whether the premium is justified over similar but cheaper compounds like grape seed extract for general cardiovascular support.
References
- Luzzi R, Belcaro G, Zulli C, et al. Pycnogenol supplementation improves cognitive function, attention and mental performance in students. Panminerva Med. 2011;53(3 Suppl 1):75-82.
- Hu S, Belcaro G, Cornelli U, et al. Effects of Pycnogenol on endothelial dysfunction in borderline hypertensive, hyperlipidemic, and hyperglycemic individuals: the borderline study. Int Angiol. 2015;34(1):43-52.
- Trebatická J, Kopasová S, Hradečná Z, et al. Treatment of ADHD with French maritime pine bark extract, Pycnogenol. Eur Child Adolesc Psychiatry. 2006;15(6):329-35.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.