Eugenol

dose

Eugenol with CAY10502 or BAY11-7082 pathway probes

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Platelets from healthy human donors; mouse mesenteric-thrombosis arm

limitations

Anucleate platelet NF-kappaB signaling and mouse plug formation do not establish chronic human outcomes.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Platelets from healthy human donors; mouse mesenteric-thrombosis arm

plain_language

Eugenol reduced collagen-stimulated IKK and p65 phosphorylation and I-kappaB-alpha degradation; inhibitor ordering placed cPLA2 upstream of NF-kappaB in human platelets.

primary_references

Eugenol: A Potential Modulator of Human Platelet Activation and Mouse Mesenteric Vascular Thrombosis via an Innovative cPLA2-NF-κB Signaling Axis. (2024). https://pubmed.ncbi.nlm.nih.gov/39200154/ DOI: 10.3390/biomedicines12081689

route

In vitro and in vivo mouse model

tissue

cPLA2 and NF-kappaB signaling

Eugenol: mechanism of action and interactions (2026-09-20) · lines 33–42

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Platelets from healthy human donors; mouse mesenteric-thrombosis arm · source_derived_draft · unverified_draft

## eugenol-cpla2-nfkb Eugenol reduced collagen-stimulated IKK and p65 phosphorylation and I-kappaB-alpha degradation; inhibitor ordering placed cPLA2 upstream of NF-kappaB in human platelets. Model/species: Platelets from healthy human donors; mouse mesenteric-thrombosis arm Tissue/system: cPLA2 and NF-kappaB signaling Exposure: Eugenol with CAY10502 or BAY11-7082 pathway probes Route: In vitro and in vivo mouse model Duration: Acute Limits: Anucleate platelet NF-kappaB signaling and mouse plug formation do not establish chronic human outcomes. Primary reference: Eugenol: A Potential Modulator of Human Platelet Activation and Mouse Mesenteric Vascular Thrombosis via an Innovative cPLA2-NF-κB Signaling Axis. (2024). https://pubmed.ncbi.nlm.nih.gov/39200154/ DOI: 10.3390/biomedicines12081689 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol concentration-response with capsazepine

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Retrogradely labeled rat dental primary afferent neurons

limitations

The sodium-current effect was TRPV1-independent in this assay; it does not specify a safe human pulp concentration.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Retrogradely labeled rat dental primary afferent neurons

plain_language

Eugenol inhibited action potentials and both tetrodotoxin-sensitive and resistant sodium currents in rat dental afferent neurons, and capsazepine did not prevent the current inhibition.

primary_references

Eugenol inhibits sodium currents in dental afferent neurons. (2006). https://pubmed.ncbi.nlm.nih.gov/16998128/ DOI: 10.1177/154405910608501005

route

In vitro

tissue

Whole-cell voltage-gated sodium current

Eugenol: mechanism of action and interactions (2026-09-20) · lines 44–53

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Retrogradely labeled rat dental primary afferent neurons · source_derived_draft · unverified_draft

## eugenol-dental-sodium-current Eugenol inhibited action potentials and both tetrodotoxin-sensitive and resistant sodium currents in rat dental afferent neurons, and capsazepine did not prevent the current inhibition. Model/species: Retrogradely labeled rat dental primary afferent neurons Tissue/system: Whole-cell voltage-gated sodium current Exposure: Eugenol concentration-response with capsazepine Route: In vitro Duration: Acute Limits: The sodium-current effect was TRPV1-independent in this assay; it does not specify a safe human pulp concentration. Primary reference: Eugenol inhibits sodium currents in dental afferent neurons. (2006). https://pubmed.ncbi.nlm.nih.gov/16998128/ DOI: 10.1177/154405910608501005 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol 100 micromolar

duration

30 minutes

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Phorbol-ester-stimulated human polymorphonuclear leukocytes

limitations

The large loss required activated cells and a high direct exposure; it is not evidence that culinary cloves cause systemic glutathione deficiency.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Phorbol-ester-stimulated human polymorphonuclear leukocytes

plain_language

Activated human polymorphonuclear leukocytes exposed to 100 micromolar eugenol lost about 90% of intracellular glutathione over 30 minutes.

primary_references

Metabolic activation of eugenol by myeloperoxidase and polymorphonuclear leukocytes. (1989). https://pubmed.ncbi.nlm.nih.gov/2562421/ DOI: 10.1021/tx00009a011

route

In vitro

tissue

Intracellular glutathione and oxidative burst

Eugenol: mechanism of action and interactions (2026-09-20) · lines 99–108

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Phorbol-ester-stimulated human polymorphonuclear leukocytes · source_derived_draft · unverified_draft

## eugenol-gsh-depletion Activated human polymorphonuclear leukocytes exposed to 100 micromolar eugenol lost about 90% of intracellular glutathione over 30 minutes. Model/species: Phorbol-ester-stimulated human polymorphonuclear leukocytes Tissue/system: Intracellular glutathione and oxidative burst Exposure: Eugenol 100 micromolar Route: In vitro Duration: 30 minutes Limits: The large loss required activated cells and a high direct exposure; it is not evidence that culinary cloves cause systemic glutathione deficiency. Primary reference: Metabolic activation of eugenol by myeloperoxidase and polymorphonuclear leukocytes. (1989). https://pubmed.ncbi.nlm.nih.gov/2562421/ DOI: 10.1021/tx00009a011 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol concentration-response; ouabain arrhythmia model

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

HEK cells expressing human Nav1.5; isolated guinea-pig atria

limitations

Channel inhibition can alter cardiac excitability; isolated atrial antiarrhythmic effects are not a human treatment result.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

HEK cells expressing human Nav1.5; isolated guinea-pig atria

plain_language

Eugenol concentration-dependently inhibited human Nav1.5, favored the inactivated state, slowed recovery, and attenuated late sodium current.

primary_references

Eugenol interacts with cardiac sodium channel and reduces heart excitability and arrhythmias. (2021). https://pubmed.ncbi.nlm.nih.gov/34217764/ DOI: 10.1016/j.lfs.2021.119761

route

In vitro and ex vivo

tissue

Cardiac sodium current and ex-vivo rhythm disturbance

Eugenol: mechanism of action and interactions (2026-09-20) · lines 55–64

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · HEK cells expressing human Nav1.5; isolated guinea-pig atria · source_derived_draft · unverified_draft

## eugenol-nav15 Eugenol concentration-dependently inhibited human Nav1.5, favored the inactivated state, slowed recovery, and attenuated late sodium current. Model/species: HEK cells expressing human Nav1.5; isolated guinea-pig atria Tissue/system: Cardiac sodium current and ex-vivo rhythm disturbance Exposure: Eugenol concentration-response; ouabain arrhythmia model Route: In vitro and ex vivo Duration: Acute Limits: Channel inhibition can alter cardiac excitability; isolated atrial antiarrhythmic effects are not a human treatment result. Primary reference: Eugenol interacts with cardiac sodium channel and reduces heart excitability and arrhythmias. (2021). https://pubmed.ncbi.nlm.nih.gov/34217764/ DOI: 10.1016/j.lfs.2021.119761 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol 2 micromolar

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Washed human platelets; ADP-treated mouse pulmonary-thrombosis arm

limitations

Ex-vivo platelet inhibition and mouse thrombosis do not establish oral antithrombotic efficacy or bleeding safety in humans.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Washed human platelets; ADP-treated mouse pulmonary-thrombosis arm

plain_language

At 2 micromolar, eugenol inhibited collagen- and arachidonic-acid-induced aggregation in human platelets but did not inhibit thrombin- or U46619-induced aggregation.

primary_references

Eugenol Suppresses Platelet Activation and Mitigates Pulmonary Thromboembolism in Humans and Murine Models. (2024). https://pubmed.ncbi.nlm.nih.gov/38396774/ DOI: 10.3390/ijms25042098

route

In vitro; mouse intervention

tissue

Agonist-specific platelet aggregation

Eugenol: mechanism of action and interactions (2026-09-20) · lines 11–20

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Washed human platelets; ADP-treated mouse pulmonary-thrombosis arm · source_derived_draft · unverified_draft

## eugenol-platelet-agonist-selectivity At 2 micromolar, eugenol inhibited collagen- and arachidonic-acid-induced aggregation in human platelets but did not inhibit thrombin- or U46619-induced aggregation. Model/species: Washed human platelets; ADP-treated mouse pulmonary-thrombosis arm Tissue/system: Agonist-specific platelet aggregation Exposure: Eugenol 2 micromolar Route: In vitro; mouse intervention Duration: Acute Limits: Ex-vivo platelet inhibition and mouse thrombosis do not establish oral antithrombotic efficacy or bleeding safety in humans. Primary reference: Eugenol Suppresses Platelet Activation and Mitigates Pulmonary Thromboembolism in Humans and Murine Models. (2024). https://pubmed.ncbi.nlm.nih.gov/38396774/ DOI: 10.3390/ijms25042098 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol around the effective 2-micromolar range

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Washed human platelets

limitations

Pathway suppression does not identify one direct binding target and must not be generalized to every platelet agonist.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Washed human platelets

plain_language

Eugenol suppressed collagen-induced PLC-gamma2/PKC, PI3K/Akt/GSK3beta, MAPK and cPLA2/thromboxane-A2 signaling in human platelets.

primary_references

Eugenol Suppresses Platelet Activation and Mitigates Pulmonary Thromboembolism in Humans and Murine Models. (2024). https://pubmed.ncbi.nlm.nih.gov/38396774/ DOI: 10.3390/ijms25042098

route

In vitro

tissue

Signal phosphorylation, ATP release, P-selectin and calcium

Eugenol: mechanism of action and interactions (2026-09-20) · lines 22–31

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Washed human platelets · source_derived_draft · unverified_draft

## eugenol-platelet-pathways Eugenol suppressed collagen-induced PLC-gamma2/PKC, PI3K/Akt/GSK3beta, MAPK and cPLA2/thromboxane-A2 signaling in human platelets. Model/species: Washed human platelets Tissue/system: Signal phosphorylation, ATP release, P-selectin and calcium Exposure: Eugenol around the effective 2-micromolar range Route: In vitro Duration: Acute Limits: Pathway suppression does not identify one direct binding target and must not be generalized to every platelet agonist. Primary reference: Eugenol Suppresses Platelet Activation and Mitigates Pulmonary Thromboembolism in Humans and Murine Models. (2024). https://pubmed.ncbi.nlm.nih.gov/38396774/ DOI: 10.3390/ijms25042098 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

MIC 0.5 mg/mL; MBC 0.8 mg/mL

duration

Growth-curve interval

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Shigella flexneri ATCC 12022 in broth and food matrices

limitations

Food-preservation concentrations and bacterial effects are not human systemic pharmacology.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Shigella flexneri ATCC 12022 in broth and food matrices

plain_language

At antibacterial concentrations, eugenol depolarized and damaged Shigella flexneri membranes, increased oxidative damage and depleted bacterial ATP.

primary_references

Antibacterial Effect of Eugenol on Shigella flexneri and Its Mechanism. (2022). https://pubmed.ncbi.nlm.nih.gov/36076751/ DOI: 10.3390/foods11172565

route

In vitro and food-matrix exposure

tissue

Growth, membrane integrity, membrane potential and ATP

Eugenol: mechanism of action and interactions (2026-09-20) · lines 132–141

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Shigella flexneri ATCC 12022 in broth and food matrices · source_derived_draft · unverified_draft

## eugenol-shigella-membrane At antibacterial concentrations, eugenol depolarized and damaged Shigella flexneri membranes, increased oxidative damage and depleted bacterial ATP. Model/species: Shigella flexneri ATCC 12022 in broth and food matrices Tissue/system: Growth, membrane integrity, membrane potential and ATP Exposure: MIC 0.5 mg/mL; MBC 0.8 mg/mL Route: In vitro and food-matrix exposure Duration: Growth-curve interval Limits: Food-preservation concentrations and bacterial effects are not human systemic pharmacology. Primary reference: Antibacterial Effect of Eugenol on Shigella flexneri and Its Mechanism. (2022). https://pubmed.ncbi.nlm.nih.gov/36076751/ DOI: 10.3390/foods11172565 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol alone or with QX-314

duration

Acute plus washout

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Rodent trigeminal-ganglion nociceptive neurons

limitations

Persistent cellular block is not a validated human dental regimen and may involve safety risks not tested here.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Rodent trigeminal-ganglion nociceptive neurons

plain_language

Eugenol activated inward current in capsaicin-sensitive trigeminal neurons and, with QX-314, produced sodium-channel and action-potential block that persisted after washout.

primary_references

Co-Application of Eugenol and QX-314 Elicits the Prolonged Blockade of Voltage-Gated Sodium Channels in Nociceptive Trigeminal Ganglion Neurons. (2020). https://pubmed.ncbi.nlm.nih.gov/33167484/ DOI: 10.3390/biom10111513

route

In vitro co-application

tissue

TRPV1-associated entry, sodium current and action potentials

Eugenol: mechanism of action and interactions (2026-09-20) · lines 66–75

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Rodent trigeminal-ganglion nociceptive neurons · source_derived_draft · unverified_draft

## eugenol-trpv1-qx314 Eugenol activated inward current in capsaicin-sensitive trigeminal neurons and, with QX-314, produced sodium-channel and action-potential block that persisted after washout. Model/species: Rodent trigeminal-ganglion nociceptive neurons Tissue/system: TRPV1-associated entry, sodium current and action potentials Exposure: Eugenol alone or with QX-314 Route: In vitro co-application Duration: Acute plus washout Limits: Persistent cellular block is not a validated human dental regimen and may involve safety risks not tested here. Primary reference: Co-Application of Eugenol and QX-314 Elicits the Prolonged Blockade of Voltage-Gated Sodium Channels in Nociceptive Trigeminal Ganglion Neurons. (2020). https://pubmed.ncbi.nlm.nih.gov/33167484/ DOI: 10.3390/biom10111513 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol and related plant flavorants

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

TRP-expressing cells and skin keratinocytes

limitations

Channel activation can contribute to chemesthesis or irritation and is not evidence of a therapeutic skin effect.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

TRP-expressing cells and skin keratinocytes

plain_language

Eugenol activated TRPV3 in heterologous and keratinocyte assays alongside related clove, oregano and thyme flavor compounds.

primary_references

Oregano, thyme and clove-derived flavors and skin sensitizers activate specific TRP channels. (2006). https://pubmed.ncbi.nlm.nih.gov/16617338/ DOI: 10.1038/nn1692

route

In vitro

tissue

TRPV3 channel activation

Eugenol: mechanism of action and interactions (2026-09-20) · lines 77–86

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · TRP-expressing cells and skin keratinocytes · source_derived_draft · unverified_draft

## eugenol-trpv3 Eugenol activated TRPV3 in heterologous and keratinocyte assays alongside related clove, oregano and thyme flavor compounds. Model/species: TRP-expressing cells and skin keratinocytes Tissue/system: TRPV3 channel activation Exposure: Eugenol and related plant flavorants Route: In vitro Duration: Acute Limits: Channel activation can contribute to chemesthesis or irritation and is not evidence of a therapeutic skin effect. Primary reference: Oregano, thyme and clove-derived flavors and skin sensitizers activate specific TRP channels. (2006). https://pubmed.ncbi.nlm.nih.gov/16617338/ DOI: 10.1038/nn1692 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol with peroxidase and hydrogen peroxide

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Purified human MPO and activated human polymorphonuclear leukocytes

limitations

The reactive intermediate was inferred from chemistry; ordinary dietary exposure and organ-specific dose were not established.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Purified human MPO and activated human polymorphonuclear leukocytes

plain_language

Human myeloperoxidase with hydrogen peroxide oxidized eugenol toward a reactive intermediate consistent with a quinone methide.

primary_references

Metabolic activation of eugenol by myeloperoxidase and polymorphonuclear leukocytes. (1989). https://pubmed.ncbi.nlm.nih.gov/2562421/ DOI: 10.1021/tx00009a011

route

In vitro

tissue

Reactive-metabolite formation and protein binding

Eugenol: mechanism of action and interactions (2026-09-20) · lines 88–97

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Purified human MPO and activated human polymorphonuclear leukocytes · source_derived_draft · unverified_draft

## eugenol-mpo-activation Human myeloperoxidase with hydrogen peroxide oxidized eugenol toward a reactive intermediate consistent with a quinone methide. Model/species: Purified human MPO and activated human polymorphonuclear leukocytes Tissue/system: Reactive-metabolite formation and protein binding Exposure: Eugenol with peroxidase and hydrogen peroxide Route: In vitro Duration: Acute Limits: The reactive intermediate was inferred from chemistry; ordinary dietary exposure and organ-specific dose were not established. Primary reference: Metabolic activation of eugenol by myeloperoxidase and polymorphonuclear leukocytes. (1989). https://pubmed.ncbi.nlm.nih.gov/2562421/ DOI: 10.1021/tx00009a011 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

dose

Eugenol with peroxidase/hydrogen peroxide plus ascorbate or glutathione

duration

Acute

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Cell-free peroxidase systems and human HL-60 cells

limitations

Cell-free protection does not prove that vitamin supplementation prevents toxicity in exposed humans.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Cell-free peroxidase systems and human HL-60 cells

plain_language

Ascorbic acid and glutathione reduced DNA-adduct formation during in-vitro peroxidase activation of eugenol by about 66% and 90%, respectively.

primary_references

Oxidation of eugenol to form DNA adducts and 8-hydroxy-2'-deoxyguanosine: role of quinone methide derivative in DNA adduct formation. (1998). https://pubmed.ncbi.nlm.nih.gov/9525278/ DOI: 10.1093/carcin/19.3.437

route

In vitro

tissue

DNA adducts and oxidative base damage

Eugenol: mechanism of action and interactions (2026-09-20) · lines 121–130

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Cell-free peroxidase systems and human HL-60 cells · source_derived_draft · unverified_draft

## eugenol-ascorbate-gsh-adduct-protection Ascorbic acid and glutathione reduced DNA-adduct formation during in-vitro peroxidase activation of eugenol by about 66% and 90%, respectively. Model/species: Cell-free peroxidase systems and human HL-60 cells Tissue/system: DNA adducts and oxidative base damage Exposure: Eugenol with peroxidase/hydrogen peroxide plus ascorbate or glutathione Route: In vitro Duration: Acute Limits: Cell-free protection does not prove that vitamin supplementation prevents toxicity in exposed humans. Primary reference: Oxidation of eugenol to form DNA adducts and 8-hydroxy-2'-deoxyguanosine: role of quinone methide derivative in DNA adduct formation. (1998). https://pubmed.ncbi.nlm.nih.gov/9525278/ DOI: 10.1093/carcin/19.3.437 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

availability_state

machinery_impairment Imported condition classification; unverified.

dose

Eugenol or quinone methide with glutathione ethyl ester

duration

Minutes to cell-death assessment

evidence_access

Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_scope

literature_reviewed; model-specific source-derived curation

experimental_model

Cultured rat liver Clone 9 cells

limitations

A cell-permeable experimental glutathione ester is not equivalent to dietary glutathione supplementation.

nutrient_topic

Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol

organism

Cultured rat liver Clone 9 cells

plain_language

Glutathione ethyl ester raised intracellular glutathione and completely protected cultured rat liver cells from eugenol- or quinone-methide-induced death.

primary_references

Comparative toxicity of eugenol and its quinone methide metabolite in cultured liver cells using kinetic fluorescence bioassays. (1998). https://pubmed.ncbi.nlm.nih.gov/9512727/ DOI: 10.1006/taap.1997.8348

route

In vitro

tissue

Glutathione, membrane physiology and cell death

trigger_kind

machinery_impairment Imported condition classification; unverified.

Eugenol: mechanism of action and interactions (2026-09-20) · lines 110–119

Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Cultured rat liver Clone 9 cells · source_derived_draft · unverified_draft

## eugenol-gsh-rescue Glutathione ethyl ester raised intracellular glutathione and completely protected cultured rat liver cells from eugenol- or quinone-methide-induced death. Model/species: Cultured rat liver Clone 9 cells Tissue/system: Glutathione, membrane physiology and cell death Exposure: Eugenol or quinone methide with glutathione ethyl ester Route: In vitro Duration: Minutes to cell-death assessment Limits: A cell-permeable experimental glutathione ester is not equivalent to dietary glutathione supplementation. Primary reference: Comparative toxicity of eugenol and its quinone methide metabolite in cultured liver cells using kinetic fluorescence bioassays. (1998). https://pubmed.ncbi.nlm.nih.gov/9512727/ DOI: 10.1006/taap.1997.8348 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.

evidence_span

{"source_cache": "artifacts/paracetamol-research/2511429.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8dbe8c6f23fc857be6bba07e2a518c59f8dc76c9f8625c25ba84030c43f6e636", "start_char": 0, "end_char": 1593, "text_sha256": "8dbe8c6f23fc857be6bba07e2a518c59f8dc76c9f8625c25ba84030c43f6e636"}

experimental_model

Prostaglandin H synthase apoenzyme reconstituted with manganese or iron protoporphyrin

exposure

Eugenol, guaiacol, butylated hydroxyanisole and acetaminophen against both reconstituted forms, with prostaglandin G2 added

limitations

The manganese-reconstituted enzyme retains cyclooxygenase but little peroxidase activity, which is what lets this study separate the two proposed sites. Its conclusion is the opposite of the peroxide-tone account.

nutrient_topic

Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. · Paracetamol

organism

Enzyme

plain_language

In an enzyme stripped of its peroxidase the drug still works, which argues it also competes at the other site.

primary_references

[apap-p2511429] Mechanism of inhibition of prostaglandin H synthase by eugenol and other phenolic peroxidase substrates. (1989). https://pubmed.ncbi.nlm.nih.gov/2511429/ DOI: 10.1016/s0026-895x(25)09658-0

tissue_or_cell_type

Reconstituted prostaglandin H synthase

Paracetamol: the enzyme it reduces rather than blocks, the isoform that turned out not to exist, the metabolite that carries the analgesia, and the metabolite that destroys the liver (2026-09-22) · lines 155–166

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Prostaglandin H synthase apoenzyme reconstituted with manganese or iron protoporphyrin · source_derived_draft · unverified_draft

### apap-maybe-the-cox-site-instead Higher concentrations of eugenol were required to inhibit iron-reconstituted prostaglandin H synthase than the manganese-reconstituted enzyme which retains cyclooxygenase but not peroxidase activity, inhibition was highly dependent on arachidonic acid concentration, adding 10 micromolar prostaglandin G2 did not prevent the inhibitory effects, and other phenolic compounds including guaiacol, butylated hydroxyanisole and acetaminophen inhibited the manganese enzyme similarly, demonstrating that these compounds specifically inhibit the cyclooxygenase component in addition to or independent of their effect on peroxide tone, which the authors suggest is due to competition with arachidonic acid for the active site. Condition category: normal nutrient_topic: Paracetamol research collection; topical membership is not evidence of a direct clinical effect, and the drug is recorded separately from the metabolites NAPQI and AM404. plain_language: In an enzyme stripped of its peroxidase the drug still works, which argues it also competes at the other site. organism: Enzyme tissue_or_cell_type: Reconstituted prostaglandin H synthase experimental_model: Prostaglandin H synthase apoenzyme reconstituted with manganese or iron protoporphyrin limitations: The manganese-reconstituted enzyme retains cyclooxygenase but little peroxidase activity, which is what lets this study separate the two proposed sites. Its conclusion is the opposite of the peroxide-tone account. exposure: Eugenol, guaiacol, butylated hydroxyanisole and acetaminophen against both reconstituted forms, with prostaglandin G2 added evidence_span: {"source_cache": "artifacts/paracetamol-research/2511429.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "8dbe8c6f23fc857be6bba07e2a518c59f8dc76c9f8625c25ba84030c43f6e636", "start_char": 0, "end_char": 1593, "text_sha256": "8dbe8c6f23fc857be6bba07e2a518c59f8dc76c9f8625c25ba84030c43f6e636"} [apap-p2511429] Mechanism of inhibition of prostaglandin H synthase by eugenol and other phenolic peroxidase substrates. (1989). https://pubmed.ncbi.nlm.nih.gov/2511429/ DOI: 10.1016/s0026-895x(25)09658-0