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Herb Profile
Japanese Knotweed
Reynoutria japonica
Botanical profile with evidence, safety, and practical fit.
Last reviewed: •3 sources citedReport a correctionProfile-wide ·C Limited
Use extra caution — Concentrated resveratrol rich extracts may affect bleeding risk and drug metabolism. Details
- Evidence
- Limited Evidence
- Typical onset
- Varies by prep
- Safety rating
- High caution
- Best for
- Antioxidant, Stress resilience, Inflammatory signaling, Metabolic health
- Avoid / review if
- Pregnancy/Breastfeeding, Bleeding Disorders, Anticoagulant/Antiplatelet Therapy Without Supervision
At a glance
From this profile's structured data- Evidence
- Grade C
- Safety
- Concentrated resveratrol-rich extracts may affect bleeding risk and drug metabolism.
- Profile context
- antioxidant
Next stepsWhere to go next — guides & comparisons
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Safety
Safety & Cautions
Concentrated resveratrol rich extracts may affect bleeding risk and drug metabolism. GI upset is possible at higher doses.
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.
Detailed safety fields
Pregnancy, breastfeeding, and contraindications
- Pregnancy/Breastfeeding
- Bleeding Disorders
- Anticoagulant/Antiplatelet Therapy Without Supervision
- And Surgery.
- Potential Additive Bleeding Risk With Anticoagulants/Antiplatelets/NSAIDs
- Caution With CYP Metabolized Drugs.
Safety classifications
- Interaction-Aware: Medication or interaction context is explicitly noted.
- Anticoagulant Caution: Bleeding or anticoagulant-adjacent caution language is present.
- Pregnancy/Breastfeeding Caution: Pregnancy or breastfeeding caution language is present.
Full safety note
- Concentrated resveratrol rich extracts may affect bleeding risk and drug metabolism. GI upset is possible at higher doses.
Safety labels
- Interaction-Aware
- Anticoagulant Caution
- Pregnancy/Breastfeeding Caution
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 pairingsBleeding / anticoagulant risk
High-Priority Caution
147 flagged pairingsBleeding / 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.
- aescin — Theoretical interaction certainty
- Aged Garlic Extract — Theoretical interaction certainty
- ajoene — Theoretical interaction certainty
- Ajwain — Theoretical interaction certainty
- Allicin — Theoretical interaction certainty
- Garlic — Theoretical interaction certainty
- American Ginseng Extract — Theoretical interaction certainty
- Andrographis — Theoretical interaction certainty
- Angelica Archangelica — Theoretical interaction certainty
- Angelica Dahurica — Theoretical interaction certainty
- Angelica Pubescens — Theoretical interaction certainty
- Angelica Root — Theoretical interaction certainty
+135 more pairings share this mechanism. Use the Safety Checker to review a specific combination.
Evidence
Evidence Summary
Evidence lens
Read as directional context, not settled clinical proof.
LimitedLimited Evidence
Human clinical evidence: Not the primary signal
Mechanistic / preclinical: Mechanism mapped — Inflammatory Signaling Modulation · Oxidative Stress Modulation · Metabolic Regulation
Research maturity: Theoretical / mechanistic research — Mechanistic or unresolved evidence is kept separate from established human outcomes.
Safety boundary: Safety note available — Concentrated resveratrol rich extracts may affect bleeding risk and drug metabolism.
This profile cites 3 human studies.
Study design details
Evidence Grade
Grade C: Limited Evidence
Evaluation of methodological rigor, population reach, and evidence alignment.
- Design Match
- Narrative review
- Risk of Bias
- High
- Consistency
- Not assessed
Strongest recorded design is a narrative review, drawn from 1 recorded study, none of which measured an outcome in people.
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 (3)0 human evidence sources · 0 human trials · Participant totals not consistently reported · Consistency not yet classifiable
Filter by study class
Showing 3 of 3 studies.
What the evidence actually shows
This table contains 3 structured sources, including 0 human evidence sources; 0 are human trials.
| Study | Design | N | Dose | Duration | Population | Outcome | Result & magnitude | Source |
|---|---|---|---|---|---|---|---|---|
Allelopathy of Knotweeds as Invasive Plants Kato-Noguchi H et al. · Plants (Basel) · 2021 Background | Narrative review Summarizes selected literature without the full prespecified search and selection methods of a systematic review. | — | — | — | — | — | — | PubMed → |
Słowiński K et al. · J Vis Exp · 2024 Background | Other / unclear The study design is not yet classified clearly enough to infer its place in the evidence hierarchy. | — | — | — | — | — | — | PubMed → |
Japanese Knotweed Rhizome Bark Extract Inhibits Live SARS-CoV-2 In Vitro Jug U et al. · Bioengineering (Basel) · 2022 Background | Other / unclear The study design is not yet classified clearly enough to infer its place in the evidence hierarchy. | — | — | — | — | — | — | PubMed → |
Dosing & Timing
- No standardized dose
- Preparation specific; use standardized product label for Do not equate standardized resveratrol extracts with crude knotweed preparations. and require source backed dosage review before therapeutic claims.
How Japanese Knotweed works
Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.
Mechanism Pathway — How Japanese Knotweed Works
CompoundTarget / ReceptorMechanismEffect / Outcome
Mechanisms & biological pathways (preclinical)
- Inflammatory Signaling Modulation
- Oxidative Stress Modulation
- Metabolic Regulation
- AMPK Signaling
- NF KB Modulation
- Nrf2 Activation
Active Compounds
Key constituents studied in Japanese Knotweed, with full pharmacology and safety profiles.
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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.
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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