Herb ·Moderate evidence ·Reviewed May 2026
French maritime pine bark extract with potent antioxidant and blood flow benefits.
The bottom line
Evidence rating moderate. Most-documented uses: blood flow, skin health, cognitive function. 19 sources indexed (2002–2024), with 9 interaction records on file.
Core mechanism
Procyanidins stimulate eNOS for nitric oxide production, inhibit COX-1/COX-2, and potently scavenge superoxide and hydroxyl radicals. Regenerates vitamins C and E.13
Dosing protocol
Pycnogenol is the most-studied branded extract. Effect on endothelial function builds over 8-12 weeks.
Ranked by evidence and value.
Real-world pricing across three quality tiers. Assumes Pycnogenol / Pine Bark Extract.
Assumes 50-200 mg/day. Vendor basis: Life Extension, NOW/iHerb, Vitacost, and Amazon marketplace; Pycnogenol-branded products set premium pricing. Updated 2026-05-28.
How much you'd eat to match a supplemental dose.
French maritime pine bark extract is a standardized bark polyphenol product, not a normal edible food.
What to test, the optimal window inside the conventional range, and how long a response takes.
Pycnogenol (100 to 200 mg per day of standardized Pinus pinaster bark extract) lowers SBP by roughly 3 to 6 mmHg and improves endothelial function in hypertensive RCTs.1,4
Pycnogenol is the most-studied branded extract. Pair with flow-mediated dilation if available.
Pine bark extract (pycnogenol) may produce a modest, dose-dependent reduction in diastolic blood pressure that is clearest when baseline pressure is elevated, with minimal change expected in already normotensive individuals.1,4
Measure after 5 minutes seated and rested, at a consistent time of day, avoiding caffeine and exercise beforehand. Average several readings across multiple days, and consider confounders such as sodium intake, sleep, and stress when interpreting changes.
Pine bark extract is expected to modestly lower fasting glucose while supporting endothelial function, with effects that are typically small, dose-dependent, and clearest when baseline glucose is elevated.1,2
Requires an 8 hour fast. Test under consistent morning conditions, since stress, illness, and recent carbohydrate intake can transiently raise glucose. Consider tracking blood pressure alongside, as endothelial effects may show there too.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Pycnogenol improves endothelial function via NO synthase support and was studied for ED in combination with L-arginine.18,1
Best evidence comes from L-arginine plus Pycnogenol combination studies.
Pycnogenol-type pine bark extract is an antioxidant that has reduced melasma pigment and area in small clinical trials.1,2
Modest human data; works best combined with daily broad-spectrum and tinted SPF, which is the cornerstone of melasma control.
Pine bark proanthocyanidins may enhance nitric oxide activity and support microcirculation and venous tone in small trials.1,2
Studied for venous insufficiency and leg edema; effects accrue over several weeks.
Proanthocyanidins from pine bark may improve venous tone and reduce leg edema in chronic venous insufficiency in small trials.
Some evidence for reducing edema and leg heaviness, though trials are small and often industry-funded.
Pine bark proanthocyanidins may improve venous tone and reduce edema and inflammation in vascular tissue.1,2
A few small trials suggest faster symptom relief during acute flares, but quality is limited; use alongside fiber and hydration.
Pycnogenol proanthocyanidins have improved skin hydration and elasticity and reduced UV-induced damage markers in studies.1,2
Effects build over months of daily use.
Pycnogenol increases endothelial nitric oxide synthase activity and has improved flow-mediated dilation in trials.13,1
Promising but mostly studied at specific branded doses; results may not generalize to all extracts.
Pine bark proanthocyanidins have been studied for improving capillary resistance and reducing edema and venous fragility.1,2
Effects overlap with grape seed, so there is little reason to stack both.
Pine bark extract may support blood flow and has anti-inflammatory activity that could ease lower urinary tract symptoms in early studies.1,2
Often studied in combination products; standalone BPH evidence is preliminary.
Pycnogenol antioxidants have reduced melasma pigmentation in small oral trials.16,1
Most data are for melasma rather than sun-induced age spots.
Maritime pine bark proanthocyanidins are used to support capillary resistance and microvascular function, though nosebleed-specific data are sparse.13,14
Overlaps mechanistically with grape seed; like it, it may affect bleeding, so review with a clinician.
A procyanidin-rich extract with antioxidant activity that may improve skin elasticity and hydration in small studies.
Mild blood-pressure and platelet effects are possible; note if on related medications.
Evidence-based stacks that include it, with the exact dose and timing each one uses.
Pine Bark Extract is a source of procyanidin antioxidants that may support healthy endothelial function and microcirculation. Direct evidence for prostate or urinary endpoints is preliminary, so its role here is supportive and exploratory.1,2
Both are oligomeric proanthocyanidin sources with overlapping antioxidant and endothelial nitric-oxide-supporting effects, giving additive vascular antioxidant support.
Recommendation: Combining is reasonable but largely redundant given the overlapping mechanism; consider whether one alone meets your goal to avoid unnecessary dosing.
Pine bark extract (Pycnogenol) combined with L-arginine improved erectile function and endothelial nitric oxide signaling in controlled clinical trials more than expected from either alone.
Recommendation: A reasonable evidence-based pairing for vascular and erectile support. People on blood-pressure-lowering medication should monitor for additive hypotension.
Vitamin C regenerates the oxidized flavonoid components of pine bark extract, helping sustain their antioxidant and endothelial-protective activity.
Recommendation: Reasonable to take together for antioxidant and vascular support. No separation needed.
L-citrulline raises plasma arginine and nitric oxide production, complementing pine bark extract's enhancement and protection of endothelial nitric oxide signaling.
Recommendation: A rational vascular-support pairing. Those on antihypertensives should watch for additive blood-pressure lowering.
Saw palmetto and pine bark extract (pycnogenol) are sometimes stacked in men's urinary and prostate formulas, pairing hormonal support with anti-inflammatory and circulatory effects.
Recommendation: Reasonable to combine for prostate and lower urinary tract support. Typical doses are saw palmetto 320 mg/day and pine bark extract 100 to 150 mg/day; allow 8 to 12 weeks for symptom change.
Pine Bark Extract (Pycnogenol) lowers blood pressure (about 3 mm Hg systolic and 3 mm Hg diastolic in a meta-analysis) and has independent ACE-inhibitory activity. Two trials specifically tested it as an adjunct to ramipril in hypertensive patients and reported significantly greater blood pressure reduction than ramipril alone. The combination is well tolerated.
Recommendation: Pine Bark Extract 100-200 mg/day is a typical research dose; monitor home blood pressure after starting and tell your prescriber so your ramipril dose can be reviewed. Mild hypotension is possible if BP is already at goal.
Pine bark extract (pycnogenol) inhibits platelet aggregation and reduces thromboxane generation. Combined with warfarin, these pharmacodynamic antiplatelet effects can additively raise bleeding risk even without changing the INR.
Recommendation: Avoid pine bark extract supplements on warfarin. If you take it, keep the dose constant, watch for unusual bruising or bleeding, and tell your anticoagulation clinic before any dose change.
Tamsulosin can cause orthostatic hypotension, especially when it is started or restarted. Pine bark extract products such as pycnogenol have shown modest blood-pressure-lowering effects in some meta-analyses. Combining them may increase dizziness, near-fainting, or fall risk in people with low baseline blood pressure, dehydration, or other blood pressure medicines.
Recommendation: Do not start pine bark extract at the same time you start or restart tamsulosin. If you use both, begin with a low pine bark dose, check sitting and standing blood pressure for 1-2 weeks, and stop the supplement if lightheadedness occurs.
Alfuzosin is used for LUTS/BPH and can contribute to blood-pressure symptoms in susceptible patients, particularly with other agents that lower vascular tone. Pine bark extract has shown modest reductions in systolic and diastolic blood pressure in some randomized-trial meta-analyses. The combination may increase lightheadedness, fatigue, or near-syncope in patients with low baseline pressure or concurrent antihypertensive therapy.
Recommendation: Start pine bark extract cautiously if you take alfuzosin. Monitor blood pressure and orthostatic symptoms during the first 1-2 weeks, and stop or reduce the supplement if readings drop below your usual range or you feel faint.
Numbered references. Citations throughout the page link here.
Meta-analysis showed Pycnogenol supplementation significantly improved endothelial function, reduced blood pressure, and improved lipid profiles in patients with cardiovascular risk factors.
Meta-analysis found Pycnogenol supplementation significantly reduced WOMAC pain and stiffness scores and improved physical function in osteoarthritis patients.
Meta-analysis showed Pycnogenol supplementation was associated with improvements in attention, memory, and executive function in healthy adults and those with cognitive decline.
Fogacci F, Tocci G, Sahebkar A et al.. Effect of Pycnogenol on Blood Pressure: Findings From a PRISMA Compliant Systematic Review and Meta-Analysis of Randomized, Double-Blind, Placebo-Controlled, Clinical Studies. Angiology. 2020
Malekahmadi M, Moradi Moghaddam O, Firouzi S et al.. Effects of pycnogenol on cardiometabolic health: A systematic review and meta-analysis of randomized controlled trials. Pharmacological research. 2019
Hadi A, Pourmasoumi M, Mohammadi H et al.. The impact of pycnogenol supplementation on plasma lipids in humans: A systematic review and meta-analysis of clinical trials. Phytotherapy research : PTR. 2019
Zhang Z, Tong X, Wei YL et al.. Effect of Pycnogenol Supplementation on Blood Pressure: A Systematic Review and Meta-analysis. Iranian journal of public health. 2018
Sahebkar A. A systematic review and meta-analysis of the effects of pycnogenol on plasma lipids. Journal of cardiovascular pharmacology and therapeutics. 2014
150 mg Pycnogenol/day for 3 months improved spatial working memory by 10.9% and quality of working memory by 8.5% vs placebo in moderate cognitive decline patients.
Pycnogenol supplementation for 12 weeks improved cognitive function and oxidative stress markers in healthy professionals.
Pycnogenol augmented endothelium-dependent vasodilation by increasing nitric oxide production in humans.
In 39 RDP trials (2,009 subjects), Pycnogenol beneficially affected cardiovascular health, cognition, joint health, skin health, and eye health over 2 weeks to 6 months.
Compelling evidence that Pycnogenol intake reduces hyperpigmentation and improves skin barrier function and extracellular matrix homeostasis.
Pycnogenol exhibits antioxidant, anti-inflammatory, and vasodilatory properties with effects on endothelial NOS and collagen/elastin stabilization.
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