Nutrient chapter

Capsaicin

Species, assay, exposure and limitations are retained on linked claims.

14 recorded mechanisms · 1 availability situations · 2 preserved sources. Draft and verified records are labeled separately.

Read recorded mechanisms Open recursive mind map

The mechanisms

What the sources say this nutrient does, one relationship at a time. Plain wording comes first; the technical statement follows.

  1. Capsaicin activates TRPV1, a nonselective cation channel that is also activated by noxious heat.

    Capsaicin → Human transient receptor potential vanilloid 1 / TRPV1 source_derived_draftungraded
    Experimental context and source evidence
    dose
    Capsaicin concentration-response and noxious-range temperature
    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
    Cloned capsaicin receptor expressed from sensory-neuron cDNA
    limitations
    The cloned receptor experiment establishes channel gating, not the whole organism response to chili foods.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Cloned capsaicin receptor expressed from sensory-neuron cDNA
    plain_language
    Capsaicin activates TRPV1, a nonselective cation channel that is also activated by noxious heat.
    primary_references
    The capsaicin receptor: a heat-activated ion channel in the pain pathway. (1997). https://pubmed.ncbi.nlm.nih.gov/9349813/ DOI: 10.1038/39807
    route
    In vitro
    tissue
    Calcium influx and heat activation

    Capsaicin: 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 · Cloned capsaicin receptor expressed from sensory-neuron cDNA · source_derived_draft · unverified_draft

    ## capsaicin-trpv1-gating Capsaicin activates TRPV1, a nonselective cation channel that is also activated by noxious heat. Model/species: Cloned capsaicin receptor expressed from sensory-neuron cDNA Tissue/system: Calcium influx and heat activation Exposure: Capsaicin concentration-response and noxious-range temperature Route: In vitro Duration: Acute Limits: The cloned receptor experiment establishes channel gating, not the whole organism response to chili foods. Primary reference: The capsaicin receptor: a heat-activated ion channel in the pain pathway. (1997). https://pubmed.ncbi.nlm.nih.gov/9349813/ DOI: 10.1038/39807 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  2. Capsaicin binds TRPV1 in a tail-up, head-down configuration and stabilizes the open state through vanillyl-group contact with the S4-S5 linker.

    Capsaicin → Human transient receptor potential vanilloid 1 / TRPV1 source_derived_draftungraded
    Experimental context and source evidence
    dose
    Capsaicin-bound channel
    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
    TRPV1 structural model with site-specific functional tests
    limitations
    The study resolves a binding mechanism but does not specify human dietary pharmacokinetics.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    TRPV1 structural model with site-specific functional tests
    plain_language
    Capsaicin binds TRPV1 in a tail-up, head-down configuration and stabilizes the open state through vanillyl-group contact with the S4-S5 linker.
    primary_references
    Structural mechanism underlying capsaicin binding and activation of the TRPV1 ion channel. (2015). https://pubmed.ncbi.nlm.nih.gov/26053297/ DOI: 10.1038/nchembio.1835
    route
    Structural and in-vitro mutational analysis
    tissue
    Ligand binding and channel opening

    Capsaicin: 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 · TRPV1 structural model with site-specific functional tests · source_derived_draft · unverified_draft

    ## capsaicin-binding-pose Capsaicin binds TRPV1 in a tail-up, head-down configuration and stabilizes the open state through vanillyl-group contact with the S4-S5 linker. Model/species: TRPV1 structural model with site-specific functional tests Tissue/system: Ligand binding and channel opening Exposure: Capsaicin-bound channel Route: Structural and in-vitro mutational analysis Duration: Acute Limits: The study resolves a binding mechanism but does not specify human dietary pharmacokinetics. Primary reference: Structural mechanism underlying capsaicin binding and activation of the TRPV1 ion channel. (2015). https://pubmed.ncbi.nlm.nih.gov/26053297/ DOI: 10.1038/nchembio.1835 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  3. Repeated capsaicin activation caused calcium-dependent TRPV1 desensitization regulated in part by calcineurin and PKA at Thr370.

    Capsaicin → TRPV1 calcium-dependent desensitization source_derived_draftungraded
    Experimental context and source evidence
    dose
    Repeated capsaicin; calcineurin inhibitor, forskolin and point mutants
    duration
    Acute repeated activation
    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
    TRPV1-transfected HEK293T or HeLa cells
    limitations
    Kinase and phosphatase manipulations identify regulatory machinery in engineered cells, not a dietary calcium threshold.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    TRPV1-transfected HEK293T or HeLa cells
    plain_language
    Repeated capsaicin activation caused calcium-dependent TRPV1 desensitization regulated in part by calcineurin and PKA at Thr370.
    primary_references
    Regulation of Ca2+-dependent desensitization in the vanilloid receptor TRPV1 by calcineurin and cAMP-dependent protein kinase. (2005). https://pubmed.ncbi.nlm.nih.gov/15691846/ DOI: 10.1074/jbc.M410917200
    route
    In vitro
    tissue
    Whole-cell capsaicin currents

    Capsaicin: 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 · TRPV1-transfected HEK293T or HeLa cells · source_derived_draft · unverified_draft

    ## capsaicin-calcineurin-desensitization Repeated capsaicin activation caused calcium-dependent TRPV1 desensitization regulated in part by calcineurin and PKA at Thr370. Model/species: TRPV1-transfected HEK293T or HeLa cells Tissue/system: Whole-cell capsaicin currents Exposure: Repeated capsaicin; calcineurin inhibitor, forskolin and point mutants Route: In vitro Duration: Acute repeated activation Limits: Kinase and phosphatase manipulations identify regulatory machinery in engineered cells, not a dietary calcium threshold. Primary reference: Regulation of Ca2+-dependent desensitization in the vanilloid receptor TRPV1 by calcineurin and cAMP-dependent protein kinase. (2005). https://pubmed.ncbi.nlm.nih.gov/15691846/ DOI: 10.1074/jbc.M410917200 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  4. Blocking phosphatidylinositol-4-kinase prevented recovery of TRPV1 after prolonged capsaicin desensitization, linking recovery to PIP2 resynthesis.

    Experimental phosphatidylinositol-4-kinase blockade → Functional recovery of desensitized TRPV1 source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    dose
    Prolonged capsaicin followed by lipid-kinase blockade
    duration
    Recovery 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
    TRPV1-expressing cells with Kir2.1 PIP2 biosensor
    limitations
    High intracellular ATP and PIP2 resynthesis were required; this is an experimental machinery perturbation, not evidence that dietary ATP supplementation changes analgesia.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    TRPV1-expressing cells with Kir2.1 PIP2 biosensor
    plain_language
    Blocking phosphatidylinositol-4-kinase prevented recovery of TRPV1 after prolonged capsaicin desensitization, linking recovery to PIP2 resynthesis.
    primary_references
    Functional recovery from desensitization of vanilloid receptor TRPV1 requires resynthesis of phosphatidylinositol 4,5-bisphosphate. (2005). https://pubmed.ncbi.nlm.nih.gov/15888659/ DOI: 10.1523/JNEUROSCI.1296-05.2005
    route
    In vitro
    tissue
    Channel recovery after desensitization
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Capsaicin: 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 · TRPV1-expressing cells with Kir2.1 PIP2 biosensor · source_derived_draft · unverified_draft

    ## capsaicin-pip2-recovery Blocking phosphatidylinositol-4-kinase prevented recovery of TRPV1 after prolonged capsaicin desensitization, linking recovery to PIP2 resynthesis. Model/species: TRPV1-expressing cells with Kir2.1 PIP2 biosensor Tissue/system: Channel recovery after desensitization Exposure: Prolonged capsaicin followed by lipid-kinase blockade Route: In vitro Duration: Recovery interval Limits: High intracellular ATP and PIP2 resynthesis were required; this is an experimental machinery perturbation, not evidence that dietary ATP supplementation changes analgesia. Primary reference: Functional recovery from desensitization of vanilloid receptor TRPV1 requires resynthesis of phosphatidylinositol 4,5-bisphosphate. (2005). https://pubmed.ncbi.nlm.nih.gov/15888659/ DOI: 10.1523/JNEUROSCI.1296-05.2005 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  5. Capsaicin cross-desensitized TRPA1 through a calcium-dependent route associated with PLC activation and PIP2 depletion.

    Capsaicin → Human TRPA1 ion channel source_derived_draftungraded
    Experimental context and source evidence
    dose
    Capsaicin followed by mustard oil/TRPA1 stimulation
    duration
    Acute sequential exposure
    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
    Sensory neurons and heterologous channel expression
    limitations
    The mechanism differed from mustard-oil homologous desensitization and was not regulated by calcineurin in this study.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Sensory neurons and heterologous channel expression
    plain_language
    Capsaicin cross-desensitized TRPA1 through a calcium-dependent route associated with PLC activation and PIP2 depletion.
    primary_references
    Transient receptor potential TRPA1 channel desensitization in sensory neurons is agonist dependent and regulated by TRPV1-directed internalization. (2007). https://pubmed.ncbi.nlm.nih.gov/17584831/ DOI: 10.1113/jphysiol.2007.133231
    route
    In vitro
    tissue
    TRPA1 responses after TRPV1 agonism

    Capsaicin: 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 · Sensory neurons and heterologous channel expression · source_derived_draft · unverified_draft

    ## capsaicin-trpa1-cross-desensitization Capsaicin cross-desensitized TRPA1 through a calcium-dependent route associated with PLC activation and PIP2 depletion. Model/species: Sensory neurons and heterologous channel expression Tissue/system: TRPA1 responses after TRPV1 agonism Exposure: Capsaicin followed by mustard oil/TRPA1 stimulation Route: In vitro Duration: Acute sequential exposure Limits: The mechanism differed from mustard-oil homologous desensitization and was not regulated by calcineurin in this study. Primary reference: Transient receptor potential TRPA1 channel desensitization in sensory neurons is agonist dependent and regulated by TRPV1-directed internalization. (2007). https://pubmed.ncbi.nlm.nih.gov/17584831/ DOI: 10.1113/jphysiol.2007.133231 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  6. Twice-daily 6 ppm capsaicin rinses reduced oral capsaicin burn over 17 days without a detected decrease in fungiform-papilla TRPV1 mRNA.

    Capsaicin → Human oral burn intensity from capsaicin source_derived_draftungraded
    Experimental context and source evidence
    dose
    6 ppm capsaicin rinse twice daily
    duration
    Days 3-17
    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
    Healthy human volunteers
    limitations
    Reduced sensation was not explained by TRPV1 transcript abundance; protein trafficking and neural adaptation were not resolved.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Healthy human volunteers
    plain_language
    Twice-daily 6 ppm capsaicin rinses reduced oral capsaicin burn over 17 days without a detected decrease in fungiform-papilla TRPV1 mRNA.
    primary_references
    Inducible desensitization to capsaicin with repeated low-dose exposure in human volunteers. (2024). https://pubmed.ncbi.nlm.nih.gov/38135109/ DOI: 10.1016/j.physbeh.2023.114447
    route
    Oral rinse
    tissue
    Oral sensory ratings and fungiform-papilla TRPV1 expression

    Capsaicin: 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 · Healthy human volunteers · source_derived_draft · unverified_draft

    ## capsaicin-human-oral-desensitization Twice-daily 6 ppm capsaicin rinses reduced oral capsaicin burn over 17 days without a detected decrease in fungiform-papilla TRPV1 mRNA. Model/species: Healthy human volunteers Tissue/system: Oral sensory ratings and fungiform-papilla TRPV1 expression Exposure: 6 ppm capsaicin rinse twice daily Route: Oral rinse Duration: Days 3-17 Limits: Reduced sensation was not explained by TRPV1 transcript abundance; protein trafficking and neural adaptation were not resolved. Primary reference: Inducible desensitization to capsaicin with repeated low-dose exposure in human volunteers. (2024). https://pubmed.ncbi.nlm.nih.gov/38135109/ DOI: 10.1016/j.physbeh.2023.114447 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  7. Repeated capsaicin rinsing reduced burn from vanillyl butyl ether, cinnamaldehyde and ethanol, while menthol cooling and sucrose sweetness did not change.

    Capsaicin → Human oral burn from vanillyl butyl ether, cinnamaldehyde and ethanol source_derived_draftungraded
    Experimental context and source evidence
    dose
    6 ppm capsaicin rinse twice daily
    duration
    17 days
    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
    Healthy human volunteers
    limitations
    The result shows selective sensory adaptation, not shared binding to one receptor for every stimulus.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Healthy human volunteers
    plain_language
    Repeated capsaicin rinsing reduced burn from vanillyl butyl ether, cinnamaldehyde and ethanol, while menthol cooling and sucrose sweetness did not change.
    primary_references
    Inducible desensitization to capsaicin with repeated low-dose exposure in human volunteers. (2024). https://pubmed.ncbi.nlm.nih.gov/38135109/ DOI: 10.1016/j.physbeh.2023.114447
    route
    Oral rinse
    tissue
    Cross-stimulus oral sensory ratings

    Capsaicin: 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 · Healthy human volunteers · source_derived_draft · unverified_draft

    ## capsaicin-human-cross-desensitization Repeated capsaicin rinsing reduced burn from vanillyl butyl ether, cinnamaldehyde and ethanol, while menthol cooling and sucrose sweetness did not change. Model/species: Healthy human volunteers Tissue/system: Cross-stimulus oral sensory ratings Exposure: 6 ppm capsaicin rinse twice daily Route: Oral rinse Duration: 17 days Limits: The result shows selective sensory adaptation, not shared binding to one receptor for every stimulus. Primary reference: Inducible desensitization to capsaicin with repeated low-dose exposure in human volunteers. (2024). https://pubmed.ncbi.nlm.nih.gov/38135109/ DOI: 10.1016/j.physbeh.2023.114447 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  8. A 24-hour 8% capsaicin patch reduced warmth detection, heat pain, histamine itch and neurogenic flare, with little effect on touch or cold and near-complete sensory recovery by day 21.

    Capsaicin → TRPV1-positive cutaneous sensory function source_derived_draftungraded
    Experimental context and source evidence
    dose
    8% capsaicin patch for 1 or 24 hours
    duration
    1, 7 and 21 days after removal
    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
    Fourteen healthy human volunteers
    limitations
    This experimental 24-hour exposure exceeds ordinary patch use and does not establish efficacy in patients with neuropathic pain.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Fourteen healthy human volunteers
    plain_language
    A 24-hour 8% capsaicin patch reduced warmth detection, heat pain, histamine itch and neurogenic flare, with little effect on touch or cold and near-complete sensory recovery by day 21.
    primary_references
    The time course of brief and prolonged topical 8% capsaicin-induced desensitization in healthy volunteers evaluated by quantitative sensory testing and vasomotor imaging. (2018). https://pubmed.ncbi.nlm.nih.gov/29845449/ DOI: 10.1007/s00221-018-5299-y
    route
    Topical
    tissue
    Quantitative sensory testing and vasomotor imaging

    Capsaicin: 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 · Fourteen healthy human volunteers · source_derived_draft · unverified_draft

    ## capsaicin-skin-selectivity A 24-hour 8% capsaicin patch reduced warmth detection, heat pain, histamine itch and neurogenic flare, with little effect on touch or cold and near-complete sensory recovery by day 21. Model/species: Fourteen healthy human volunteers Tissue/system: Quantitative sensory testing and vasomotor imaging Exposure: 8% capsaicin patch for 1 or 24 hours Route: Topical Duration: 1, 7 and 21 days after removal Limits: This experimental 24-hour exposure exceeds ordinary patch use and does not establish efficacy in patients with neuropathic pain. Primary reference: The time course of brief and prolonged topical 8% capsaicin-induced desensitization in healthy volunteers evaluated by quantitative sensory testing and vasomotor imaging. (2018). https://pubmed.ncbi.nlm.nih.gov/29845449/ DOI: 10.1007/s00221-018-5299-y Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  9. In a randomized crossover trial, capsaicin maintained postprandial fat oxidation above placebo during the 90-minute observation period.

    Capsaicin → Human postprandial fat oxidation source_derived_draftungraded
    Experimental context and source evidence
    dose
    Oral capsaicin arm versus placebo and other flavor agonists
    duration
    90 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
    Healthy human participants
    limitations
    Energy expenditure increased after cinnamaldehyde, not specifically after capsaicin in the reported abstract; the capsaicin dose was judged sensorially intense.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Healthy human participants
    plain_language
    In a randomized crossover trial, capsaicin maintained postprandial fat oxidation above placebo during the 90-minute observation period.
    primary_references
    Effects of TRP channel agonist ingestion on metabolism and autonomic nervous system in a randomized clinical trial of healthy subjects. (2016). https://pubmed.ncbi.nlm.nih.gov/26883089/ DOI: 10.1038/srep20795
    route
    Oral
    tissue
    Indirect calorimetry and autonomic measures

    Capsaicin: 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 · Healthy human participants · source_derived_draft · unverified_draft

    ## capsaicin-fat-oxidation In a randomized crossover trial, capsaicin maintained postprandial fat oxidation above placebo during the 90-minute observation period. Model/species: Healthy human participants Tissue/system: Indirect calorimetry and autonomic measures Exposure: Oral capsaicin arm versus placebo and other flavor agonists Route: Oral Duration: 90 minutes Limits: Energy expenditure increased after cinnamaldehyde, not specifically after capsaicin in the reported abstract; the capsaicin dose was judged sensorially intense. Primary reference: Effects of TRP channel agonist ingestion on metabolism and autonomic nervous system in a randomized clinical trial of healthy subjects. (2016). https://pubmed.ncbi.nlm.nih.gov/26883089/ DOI: 10.1038/srep20795 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  10. Piperine and capsaicin both stimulated TRPV1-dependent calcium responses in human PC-3 cells and both showed reduced responses on second exposure.

    Piperine → Capsaicin source_derived_draftungraded
    Experimental context and source evidence
    dose
    Capsaicin or piperine concentration-response; second exposure; SB366791 control
    duration
    Acute sequential exposure
    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
    Human PC-3 cells expressing TRPV1
    limitations
    Comparable assay behavior does not establish equivalent potency, oral exposure, or benefit in humans.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Human PC-3 cells expressing TRPV1
    plain_language
    Piperine and capsaicin both stimulated TRPV1-dependent calcium responses in human PC-3 cells and both showed reduced responses on second exposure.
    primary_references
    Pharmacodynamics of TRPV1 agonists in a bioassay using human PC-3 cells. (2014). https://pubmed.ncbi.nlm.nih.gov/24688365/ DOI: 10.1155/2014/184526
    route
    In vitro
    tissue
    Fluo-4 calcium-response bioassay

    Capsaicin: 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 · Human PC-3 cells expressing TRPV1 · source_derived_draft · unverified_draft

    ## capsaicin-piperine-shared-trpv1 Piperine and capsaicin both stimulated TRPV1-dependent calcium responses in human PC-3 cells and both showed reduced responses on second exposure. Model/species: Human PC-3 cells expressing TRPV1 Tissue/system: Fluo-4 calcium-response bioassay Exposure: Capsaicin or piperine concentration-response; second exposure; SB366791 control Route: In vitro Duration: Acute sequential exposure Limits: Comparable assay behavior does not establish equivalent potency, oral exposure, or benefit in humans. Primary reference: Pharmacodynamics of TRPV1 agonists in a bioassay using human PC-3 cells. (2014). https://pubmed.ncbi.nlm.nih.gov/24688365/ DOI: 10.1155/2014/184526 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  11. Capsaicin dose-dependently reduced mitochondrial membrane potential in primary cardiomyocytes, and capsazepine or cyclosporine blocked the effect.

    Capsaicin → Cardiomyocyte mitochondrial membrane potential source_derived_draftungraded
    Experimental context and source evidence
    dose
    Capsaicin with capsazepine or cyclosporine controls
    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
    Primary cardiomyocytes; rat reperfusion model for downstream peptide work
    limitations
    The later infarct-size benefit was produced by the V1-cal peptide, not by capsaicin; capsaicin itself must not inherit that therapeutic result.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Primary cardiomyocytes; rat reperfusion model for downstream peptide work
    plain_language
    Capsaicin dose-dependently reduced mitochondrial membrane potential in primary cardiomyocytes, and capsazepine or cyclosporine blocked the effect.
    primary_references
    Transient Receptor Potential Vanilloid 1 Regulates Mitochondrial Membrane Potential and Myocardial Reperfusion Injury. (2016). https://pubmed.ncbi.nlm.nih.gov/27671317/ DOI: 10.1161/JAHA.116.003774
    route
    In vitro
    tissue
    Mitochondrial TRPV1 and membrane potential

    Capsaicin: 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 · Primary cardiomyocytes; rat reperfusion model for downstream peptide work · source_derived_draft · unverified_draft

    ## capsaicin-cardiomyocyte-mitochondria Capsaicin dose-dependently reduced mitochondrial membrane potential in primary cardiomyocytes, and capsazepine or cyclosporine blocked the effect. Model/species: Primary cardiomyocytes; rat reperfusion model for downstream peptide work Tissue/system: Mitochondrial TRPV1 and membrane potential Exposure: Capsaicin with capsazepine or cyclosporine controls Route: In vitro Duration: Acute Limits: The later infarct-size benefit was produced by the V1-cal peptide, not by capsaicin; capsaicin itself must not inherit that therapeutic result. Primary reference: Transient Receptor Potential Vanilloid 1 Regulates Mitochondrial Membrane Potential and Myocardial Reperfusion Injury. (2016). https://pubmed.ncbi.nlm.nih.gov/27671317/ DOI: 10.1161/JAHA.116.003774 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  12. A non-enteric capsaicin/green-tea/caffeine/tyrosine/calcium mixture increased 24-hour energy expenditure by 160 kJ/day versus placebo; the enteric version did not.

    Capsaicin, green-tea extract, caffeine, tyrosine and calcium supplement → Human 24-hour energy expenditure source_derived_draftungraded
    Experimental context and source evidence
    dose
    Seven days of simple, enteric-coated or placebo preparation
    duration
    7 days
    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
    Nineteen overweight or obese men in a randomized three-way crossover trial
    limitations
    This is a mixture and formulation result, not an isolated-capsaicin estimate; the simple-versus-enteric comparison was P=0.09.
    nutrient_topic
    Capsaicin chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Capsaicin
    organism
    Nineteen overweight or obese men in a randomized three-way crossover trial
    plain_language
    A non-enteric capsaicin/green-tea/caffeine/tyrosine/calcium mixture increased 24-hour energy expenditure by 160 kJ/day versus placebo; the enteric version did not.
    primary_references
    Bioactive food stimulants of sympathetic activity: effect on 24-h energy expenditure and fat oxidation. (2005). https://pubmed.ncbi.nlm.nih.gov/15870822/ DOI: 10.1038/sj.ejcn.1602121
    route
    Oral multi-ingredient supplement
    tissue
    Respiration-chamber energy expenditure

    Capsaicin: 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 · Nineteen overweight or obese men in a randomized three-way crossover trial · source_derived_draft · unverified_draft

    ## capsaicin-multi-ingredient-energy A non-enteric capsaicin/green-tea/caffeine/tyrosine/calcium mixture increased 24-hour energy expenditure by 160 kJ/day versus placebo; the enteric version did not. Model/species: Nineteen overweight or obese men in a randomized three-way crossover trial Tissue/system: Respiration-chamber energy expenditure Exposure: Seven days of simple, enteric-coated or placebo preparation Route: Oral multi-ingredient supplement Duration: 7 days Limits: This is a mixture and formulation result, not an isolated-capsaicin estimate; the simple-versus-enteric comparison was P=0.09. Primary reference: Bioactive food stimulants of sympathetic activity: effect on 24-h energy expenditure and fat oxidation. (2005). https://pubmed.ncbi.nlm.nih.gov/15870822/ DOI: 10.1038/sj.ejcn.1602121 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  13. Lower gamma-nonalactone concentrations shifted the capsaicin response toward greater sensitivity with little change in maximum response.

    Gamma-nonalactone → Human transient receptor potential vanilloid 1 / TRPV1 source_derived_draftungraded
    Experimental context and source evidence
    dose
    Gamma-nonalactone 0.64 or 1.28 mM with a capsaicin concentration series
    duration
    Acute calcium response
    evidence_access
    Primary full-text methods/results inspected; PubMed metadata where indexed.
    evidence_scope
    literature_reviewed; model-specific source-derived curation
    experimental_model
    Human TRPV1-expressing HEK293 cells
    limitations
    Functional curve shifts do not directly locate a binding site. No human pungency or pain outcome was tested.
    nutrient_topic
    Gamma-nonalactone flavor-compound chapter; nutrient and drug interactions retain their experimental settings. · Gamma-nonalactone
    organism
    Human TRPV1-expressing HEK293 cells
    plain_language
    Lower gamma-nonalactone concentrations shifted the capsaicin response toward greater sensitivity with little change in maximum response.
    primary_references
    Agonistic/antagonistic properties of lactones in food flavors on the sensory ion channels TRPV1 and TRPA1. (2022). https://pubmed.ncbi.nlm.nih.gov/36374622/ DOI: 10.1093/chemse/bjac023
    route
    In vitro co-application
    tissue
    Capsaicin concentration-response assay

    Gamma-nonalactone: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 37–46

    Original AI-assisted curation of eight primary studies. Study-specific citations, negative findings and limitations retained. Not publisher full text. · supports · Human TRPV1-expressing HEK293 cells · source_derived_draft · unverified_draft

    ## gamma-nonalactone-capsaicin-low Lower gamma-nonalactone concentrations shifted the capsaicin response toward greater sensitivity with little change in maximum response. Model/species: Human TRPV1-expressing HEK293 cells Tissue: Capsaicin concentration-response assay Exposure: Gamma-nonalactone 0.64 or 1.28 mM with a capsaicin concentration series Route: In vitro co-application Duration: Acute calcium response Limits: Functional curve shifts do not directly locate a binding site. No human pungency or pain outcome was tested. Primary reference: Agonistic/antagonistic properties of lactones in food flavors on the sensory ion channels TRPV1 and TRPA1. (2022). https://pubmed.ncbi.nlm.nih.gov/36374622/ DOI: 10.1093/chemse/bjac023 Access: Primary full-text methods/results inspected; PubMed metadata where indexed.
    Complete structured claim and evidence

  14. At 2.56 mM, gamma-nonalactone reduced capsaicin sensitivity and maximum response.

    Gamma-nonalactone → Human transient receptor potential vanilloid 1 / TRPV1 source_derived_draftungraded
    Experimental context and source evidence
    dose
    Gamma-nonalactone 2.56 mM with a capsaicin concentration series
    duration
    Acute calcium response
    evidence_access
    Primary full-text methods/results inspected; PubMed metadata where indexed.
    evidence_scope
    literature_reviewed; model-specific source-derived curation
    experimental_model
    Human TRPV1-expressing HEK293 cells
    limitations
    Concentration-dependent mixed modulation; not a potent selective antagonist or established dietary interaction.
    nutrient_topic
    Gamma-nonalactone flavor-compound chapter; nutrient and drug interactions retain their experimental settings. · Gamma-nonalactone
    organism
    Human TRPV1-expressing HEK293 cells
    plain_language
    At 2.56 mM, gamma-nonalactone reduced capsaicin sensitivity and maximum response.
    primary_references
    Agonistic/antagonistic properties of lactones in food flavors on the sensory ion channels TRPV1 and TRPA1. (2022). https://pubmed.ncbi.nlm.nih.gov/36374622/ DOI: 10.1093/chemse/bjac023
    route
    In vitro co-application
    tissue
    Capsaicin concentration-response assay

    Gamma-nonalactone: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 48–57

    Original AI-assisted curation of eight primary studies. Study-specific citations, negative findings and limitations retained. Not publisher full text. · supports · Human TRPV1-expressing HEK293 cells · source_derived_draft · unverified_draft

    ## gamma-nonalactone-capsaicin-high At 2.56 mM, gamma-nonalactone reduced capsaicin sensitivity and maximum response. Model/species: Human TRPV1-expressing HEK293 cells Tissue: Capsaicin concentration-response assay Exposure: Gamma-nonalactone 2.56 mM with a capsaicin concentration series Route: In vitro co-application Duration: Acute calcium response Limits: Concentration-dependent mixed modulation; not a potent selective antagonist or established dietary interaction. Primary reference: Agonistic/antagonistic properties of lactones in food flavors on the sensory ion channels TRPV1 and TRPA1. (2022). https://pubmed.ncbi.nlm.nih.gov/36374622/ DOI: 10.1093/chemse/bjac023 Access: Primary full-text methods/results inspected; PubMed metadata where indexed.
    Complete structured claim and evidence

Availability and dependencies

Each situation shows the normal role first, then what the sources report under a specific condition. A shortfall in the diet, a fault in the machinery, and a low blood reading are kept separate because they are not the same thing.

PIP2 resynthesis is required for recovery from capsaicin desensitization

Condition: machinery_impairment · Phosphatidylinositol-4-kinase is blocked after desensitization.

Normal role: TRPV1 can recover after prolonged capsaicin exposure when membrane PIP2 is replenished.

Recorded consequence: Functional TRPV1 recovery is abolished.

Scope: In-vitro channel-recovery assay.

The sources

Every document behind this chapter is preserved word for word. Open one to read it in full with its recorded conflicts marked in place.

  • Capsaicin: mechanism of action and interactions (2026-09-20)Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · unverified_draftRead preserved source
  • Gamma-nonalactone: mechanisms, molecular forms and cross-actor connections (2026-09-20)Original AI-assisted curation of eight primary studies. Study-specific citations, negative findings and limitations retained. Not publisher full text. · unverified_draftRead preserved source

Recorded disagreements

Where two sources say different things, both are kept and the difference is explained. You can discuss a disagreement or propose a mechanism that might account for it.

    Open questions in this collection

    Questions the curators could not answer from the sources in front of them, kept here with the reason each one is still open. These are gaps in this collection, not findings or proof that no one has studied them.

      Chapters are assembled from supplied drafts and curated literature summaries. Statements remain unverified against the primary studies, and the ledger is not medical advice.

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      Evidence, AI assistance and curation standards