Compound Profile

Pycnogenol

Improves endothelial function and reduces blood pressure.

Last reviewed: •1 source citedReport a correctionProfile-wide ·D Preliminary

Use extra caution — Safety notes are not source complete in this workbook row; avoid broad safety claims and hold for interaction, population, and formulation review. Details

Evidence
Preliminary evidence
Typical onset
Varies by prep
Safety rating
Use extra caution: Interaction risk
Best for
Cardiovascular Health, Oxidative Stress, Stress Response
Avoid / review if
Autoimmune Conditions (Immunostimulant Activity May Theoretically Worsen Disease Activity), Diabetes Medications (May Lower Blood Glucose And Increase Hypoglycemia Risk)
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Pycnogenol monograph visual
Generated profile category visual

Safety

Safety & Cautions

Safety notes are not source complete in this workbook row; avoid broad safety claims and hold for interaction, population, and formulation review.

High caution

Caution level: High. Multiple caution categories apply, or the record uses avoid/contraindication language.

  • Interaction-AwareMedication or interaction context is explicitly noted.
  • Anticoagulant CautionBleeding or anticoagulant-adjacent caution language is present.
  • Pregnancy/Breastfeeding CautionPregnancy or breastfeeding caution language is present.

Evidence-based safety

Caution when combined

Severity and certainty are shown separately. A high-priority caution can still be theoretical: these pairings are screened from shared contraindication mechanisms and are not automatically documented clinical interactions. Provenance identifies the source fields that produced each flag; it does not upgrade the certainty of the pairwise claim.

High-Priority Caution

147 flagged pairings

Bleeding / anticoagulant risk

Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.

Bleeding / anticoagulant riskCertainty: Theoretical

Data provenance recorded for 147 of 147 pairings in this mechanism group.

+135 more pairings share this mechanism. Use the Safety Checker to review a specific combination.

Moderate Caution

110 flagged pairings

Blood-sugar lowering

Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.

Blood-sugar loweringCertainty: Theoretical

Data provenance recorded for 110 of 110 pairings in this mechanism group.

+98 more pairings share this mechanism. Use the Safety Checker to review a specific combination.

Evidence Summary

Profile-wide ·D Preliminary

Evidence lens

Early signal that needs stronger human replication before practical claims.

PreliminaryPreliminary evidence

Human clinical evidence: Present in source signals

Mechanistic / preclinical: Mechanism mapped — Oxidative Stress Modulation · Vascular Function Support · Endothelial Function Support

Research maturity: Preliminary research — Early findings are not treated as established consumer benefit.

Safety boundary: Safety note available — Safety notes are not source complete in this workbook row; avoid broad safety claims and hold for interaction, population, and formulation review.

This profile cites 1 human study.

Evidence Strength

Confidence estimate based on the design quality and consistency of published clinical trials.

Preliminary evidence

Pycnogenol has a preliminary evidence rating.

AdaptogenStress & MoodRecoveryLongevity
Citation density
0.2
Sources
1
Effects
5
Research recency
Mixed recency
Evidence Grade

Grade D: Preliminary / Theoretical Evidence

Evaluation of methodological rigor, population reach, and evidence alignment.

Design Match
Meta analysis
Risk of Bias
Low
Consistency
Mixed
Strongest recorded design is a meta analysis, drawn from 2 recorded studies, 2 in people. Findings across those studies disagree.
How evidence grades work

Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.

Strong
Multiple RCTs, consistent direction, adequate effect size
Moderate
Some RCTs or consistent observational data in humans
Preliminary / Mixed
Animal or in-vitro only, or conflicting human data
Traditional / Theoretical
Traditional use only; no controlled human trials
Clinical Study Summaries (1)1 human evidence source · 0 human trials · ~626 participants across 1 human evidence source with reported N · Consistency not yet classifiable

What the evidence actually shows

This table contains 1 structured source, including 1 human evidence source; 0 are human trials. Across 1 human evidence source with a reported sample size, the approximate participant total is 626; overlapping publications may include some of the same people.

StudyDesignNDoseDurationPopulationOutcomeResult & magnitudeSource

Effect of Pycnogenol on Blood Pressure: Findings From a PRISMA Compliant Systematic Review and Meta-Analysis of Randomized, Double-Blind, Placebo-Controlled, Clinical Studies

PubMed · Angiology · 2020

Background
Meta-analysis

Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies.

n=626—————PubMed →

How Pycnogenol Works

Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.

Mechanism Pathway — How Pycnogenol Works

How Pycnogenol WorksPycnogenol acts on biological target pathways via antioxidant, leading to cardiovascular health.PycnogenolBiological TargetBiological pathwayAntioxidantCardiovascular HealthObservable outcomeVascular FunctionSupport
CompoundTarget / ReceptorMechanismEffect / Outcome

Dosing

No standardized dose
No standardized dose is established for this ingredient in our source data. Preparations differ widely, so follow the standardization on the product you actually have and speak to a clinician before starting.
Mechanisms & biological pathways

Preclinical mechanism details from scientific profiles; these represent plausible pathways but do not guarantee clinical efficacy in humans.

  • Oxidative Stress Modulation
  • Vascular Function Support
  • Endothelial Function Support
  • Endothelial Function
  • Oxidative Stress

Botanical Context

Source botanicals and comparison guides related to Pycnogenol.

Compare active botanicals

Compare & Sourcing

Compare side-by-side tradeoffs or verify active marker guidelines.

Safety first · Harm reduction

This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.

Learn how we evaluate confidence, safety, and intensity on the methodology page.

By Willie B. Randolph III

Founder & Head Researcher · Oak Ridge, TN · Last reviewed August 2026

Editorial Review

Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.

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