Component

gamma-Butyrobetaine

Independent small molecule record; interpretation is limited by each linked claim and its study context.

12 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What it acts on

  1. Human tissue assays detected gamma-butyrobetaine-to-carnitine activity in liver, kidney and brain, but not heart or skeletal muscle; the earlier steps were detected in all five tissues.

    gamma-Butyrobetaine → Human tissue carnitine biosynthetic enzyme activity source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Human tissue homogenate enzyme assays.
    limitations
    Detection limits, developmental stage and sampled tissues constrain the result; not an absolute modern atlas.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    Some tissues rely on importing the finished molecule.
    primary_references
    Tissue distribution of carnitine biosynthetic enzymes in man. · 1980 · https://pubmed.ncbi.nlm.nih.gov/6770910/ · DOI 10.1016/0304-4165(80)90133-6

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 26–32

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Human tissue homogenate enzyme assays. · source_derived_draft · unverified_draft

    ## l-carnitine-tissue-synthesis Some tissues rely on importing the finished molecule. Human tissue assays detected gamma-butyrobetaine-to-carnitine activity in liver, kidney and brain, but not heart or skeletal muscle; the earlier steps were detected in all five tissues. Model: Human tissue homogenate enzyme assays. Limitations: Detection limits, developmental stage and sampled tissues constrain the result; not an absolute modern atlas. Evidence access: Primary abstract Tissue distribution of carnitine biosynthetic enzymes in man. · 1980 · https://pubmed.ncbi.nlm.nih.gov/6770910/ · DOI 10.1016/0304-4165(80)90133-6
    Complete structured claim and evidence

  2. BBOX1 hydroxylates gamma-butyrobetaine to L-carnitine using oxygen, 2-oxoglutarate and ferrous iron.

    gamma-Butyrobetaine → L-Carnitine source_derived_draftungraded
    Experimental context and source evidence
    experimental_model
    Human cDNA expression and human tissue activity assays
    limitations
    Do not generalize full carnitine-synthesis capacity to every tissue.
    organism
    Homo sapiens
    plain_language
    BBOX1 completes carnitine synthesis.
    primary_references
    [vaz1998] Carnitine biosynthesis: identification of the cDNA encoding human gamma-butyrobetaine hydroxylase (1998). https://pubmed.ncbi.nlm.nih.gov/9753662/ DOI: 10.1006/bbrc.1998.9343 [rebouche1980] Tissue distribution of carnitine biosynthetic enzymes in man (1980). https://pubmed.ncbi.nlm.nih.gov/6770910/ DOI: 10.1016/0304-4165(80)90133-6
    tissue_or_cell_type
    Kidney, liver and brain; abundance differs

    L-Lysine: mechanism-first literature curation (2026-09-17) · lines 207–216

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human cDNA expression and human tissue activity assays · source_derived_draft · unverified_draft

    ### bbox1-carnitine-formation BBOX1 hydroxylates gamma-butyrobetaine to L-carnitine using oxygen, 2-oxoglutarate and ferrous iron. Plain language: BBOX1 completes carnitine synthesis. Condition category: normal organism: Homo sapiens tissue_or_cell_type: Kidney, liver and brain; abundance differs experimental_model: Human cDNA expression and human tissue activity assays limitations: Do not generalize full carnitine-synthesis capacity to every tissue. [vaz1998] Carnitine biosynthesis: identification of the cDNA encoding human gamma-butyrobetaine hydroxylase (1998). https://pubmed.ncbi.nlm.nih.gov/9753662/ DOI: 10.1006/bbrc.1998.9343 [rebouche1980] Tissue distribution of carnitine biosynthetic enzymes in man (1980). https://pubmed.ncbi.nlm.nih.gov/6770910/ DOI: 10.1016/0304-4165(80)90133-6
    Complete structured claim and evidence

  3. Oral gamma-butyrobetaine increased urine-based estimated carnitine synthesis by 41–50 micromol/kg/day across ascorbate-replete, deficient and pair-fed guinea-pig groups; vitamin C deficiency did not abolish the precursor response.

    gamma-Butyrobetaine → Guinea-pig carnitine synthesis estimated from urinary output source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing.
    experimental_model
    Guinea-pig dietary deficiency with pair feeding and precursor loading
    exposure
    Vitamin C deficient diet for 28 days; oral trimethyllysine or gamma-butyrobetaine 0.5 mmol/kg/day on days 19–28, with replete and pair-fed controls.
    limitations
    Estimate is derived from excretion during a large precursor load, not isotope-resolved basal flux; does not show all tissues are vitamin-C-independent.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Cavia porcellus
    plain_language
    Even vitamin-C-deficient animals could make substantial carnitine when given this precursor.
    primary_references
    [carnitine1995] The ability of guinea pigs to synthesize carnitine at a normal rate from epsilon-N-trimethyllysine or gamma-butyrobetaine in vivo is not compromised by experimental vitamin C deficiency. (1995). https://pubmed.ncbi.nlm.nih.gov/7752911/ DOI: 10.1016/0026-0495(95)90120-5
    tissue_or_cell_type
    Whole animal; urine-based synthesis estimate
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 767–778

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Guinea-pig dietary deficiency with pair feeding and precursor loading · source_derived_draft · unverified_draft

    ### vc-enzyme-deficient-bb-response Oral gamma-butyrobetaine increased urine-based estimated carnitine synthesis by 41–50 micromol/kg/day across ascorbate-replete, deficient and pair-fed guinea-pig groups; vitamin C deficiency did not abolish the precursor response. Condition category: nutrient_deficiency nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Even vitamin-C-deficient animals could make substantial carnitine when given this precursor. organism: Cavia porcellus tissue_or_cell_type: Whole animal; urine-based synthesis estimate experimental_model: Guinea-pig dietary deficiency with pair feeding and precursor loading limitations: Estimate is derived from excretion during a large precursor load, not isotope-resolved basal flux; does not show all tissues are vitamin-C-independent. cross_nutrient: Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing. exposure: Vitamin C deficient diet for 28 days; oral trimethyllysine or gamma-butyrobetaine 0.5 mmol/kg/day on days 19–28, with replete and pair-fed controls. [carnitine1995] The ability of guinea pigs to synthesize carnitine at a normal rate from epsilon-N-trimethyllysine or gamma-butyrobetaine in vivo is not compromised by experimental vitamin C deficiency. (1995). https://pubmed.ncbi.nlm.nih.gov/7752911/ DOI: 10.1016/0026-0495(95)90120-5
    Complete structured claim and evidence

  4. Gamma-butyrobetaine supplementation lowered both reduced and total cellular vitamin C content during the guinea-pig hepatocyte carnitine-synthesis experiment.

    gamma-Butyrobetaine → Guinea-pig hepatocyte ascorbate content source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing.
    experimental_model
    Primary cultured male guinea-pig hepatocyte monolayers
    exposure
    Ascorbate preloading followed by 4-hour gamma-butyrobetaine incubation; precursor range includes 0.05–1.0 mM and 5 mM.
    limitations
    Pool decrease alone does not establish exact ascorbate stoichiometry or identify all oxidation, export and degradation pathways.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Cavia porcellus
    plain_language
    Supplying the carnitine precursor lowered the cells’ measured vitamin C pools.
    primary_references
    [hepatocytes1991] The regulatory effect of ascorbate on the carnitine synthesis in primary cultured guinea pig hepatocytes. (1991). https://pubmed.ncbi.nlm.nih.gov/1765841/ DOI: 10.3177/jnsv.37.371
    tissue_or_cell_type
    Hepatocytes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 715–726

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Primary cultured male guinea-pig hepatocyte monolayers · source_derived_draft · unverified_draft

    ### vc-enzyme-precursor-lowers-cell-ascorbate Gamma-butyrobetaine supplementation lowered both reduced and total cellular vitamin C content during the guinea-pig hepatocyte carnitine-synthesis experiment. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Supplying the carnitine precursor lowered the cells’ measured vitamin C pools. organism: Cavia porcellus tissue_or_cell_type: Hepatocytes experimental_model: Primary cultured male guinea-pig hepatocyte monolayers limitations: Pool decrease alone does not establish exact ascorbate stoichiometry or identify all oxidation, export and degradation pathways. cross_nutrient: Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing. exposure: Ascorbate preloading followed by 4-hour gamma-butyrobetaine incubation; precursor range includes 0.05–1.0 mM and 5 mM. [hepatocytes1991] The regulatory effect of ascorbate on the carnitine synthesis in primary cultured guinea pig hepatocytes. (1991). https://pubmed.ncbi.nlm.nih.gov/1765841/ DOI: 10.3177/jnsv.37.371
    Complete structured claim and evidence

What acts on it

  1. Expressing human ALDH9 in bacteria produced NAD+-dependent trimethylaminobutyraldehyde dehydrogenase activity, completing the aldehyde-to-gamma-butyrobetaine step.

    ALDH9A1 → gamma-Butyrobetaine source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Recombinant human ALDH9 compared with purified and recombinant rat enzyme.
    limitations
    NAD+ dependence does not establish benefit from niacin supplementation.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    A niacin-derived coenzyme participates in making carnitine.
    primary_references
    Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis. · 2000 · https://pubmed.ncbi.nlm.nih.gov/10702312/ · DOI 10.1074/jbc.275.10.7390

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 18–24

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Recombinant human ALDH9 compared with purified and recombinant rat enzyme. · source_derived_draft · unverified_draft

    ## l-carnitine-aldehyde-step A niacin-derived coenzyme participates in making carnitine. Expressing human ALDH9 in bacteria produced NAD+-dependent trimethylaminobutyraldehyde dehydrogenase activity, completing the aldehyde-to-gamma-butyrobetaine step. Model: Recombinant human ALDH9 compared with purified and recombinant rat enzyme. Limitations: NAD+ dependence does not establish benefit from niacin supplementation. Evidence access: Primary abstract Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis. · 2000 · https://pubmed.ncbi.nlm.nih.gov/10702312/ · DOI 10.1074/jbc.275.10.7390
    Complete structured claim and evidence

  2. Human tracer, fecal culture and antibiotic studies supported microbial conversion of carnitine to gamma-butyrobetaine, occurring rapidly in both dietary groups.

    L-Carnitine → gamma-Butyrobetaine source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Omnivores and vegans/vegetarians; labeled oral substrates, cultures and antibiotics.
    limitations
    This host-microbe direction differs from human BBOX1 synthesis of carnitine; no single universal flux.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    Gut microbes can send carnitine into a different chemical pathway.
    primary_references
    l-Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30530985/ · DOI 10.1172/JCI94601

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 346–352

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Omnivores and vegans/vegetarians; labeled oral substrates, cultures and antibiotics. · source_derived_draft · unverified_draft

    ## l-carnitine-microbial-first-step Gut microbes can send carnitine into a different chemical pathway. Human tracer, fecal culture and antibiotic studies supported microbial conversion of carnitine to gamma-butyrobetaine, occurring rapidly in both dietary groups. Model: Omnivores and vegans/vegetarians; labeled oral substrates, cultures and antibiotics. Limitations: This host-microbe direction differs from human BBOX1 synthesis of carnitine; no single universal flux. Evidence access: Primary abstract l-Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30530985/ · DOI 10.1172/JCI94601
    Complete structured claim and evidence

  3. Human ALDH9A1 oxidizes trimethylaminobutyraldehyde to gamma-butyrobetaine using NAD+.

    4-Trimethylaminobutyraldehyde → gamma-Butyrobetaine source_derived_draftungraded
    Experimental context and source evidence
    experimental_model
    Rat enzyme purification and recombinant human ALDH9 comparison
    limitations
    ALDH9A1 has additional aldehyde substrates.
    organism
    Homo sapiens
    plain_language
    An aldehyde is converted into the immediate carnitine precursor.
    primary_references
    [vaz2000] Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis (2000). https://pubmed.ncbi.nlm.nih.gov/10702312/ DOI: 10.1074/jbc.275.10.7390
    tissue_or_cell_type
    Cytosolic carnitine-biosynthesis reaction

    L-Lysine: mechanism-first literature curation (2026-09-17) · lines 197–205

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Rat enzyme purification and recombinant human ALDH9 comparison · source_derived_draft · unverified_draft

    ### aldh9a1-tmaba-oxidation Human ALDH9A1 oxidizes trimethylaminobutyraldehyde to gamma-butyrobetaine using NAD+. Plain language: An aldehyde is converted into the immediate carnitine precursor. Condition category: normal organism: Homo sapiens tissue_or_cell_type: Cytosolic carnitine-biosynthesis reaction experimental_model: Rat enzyme purification and recombinant human ALDH9 comparison limitations: ALDH9A1 has additional aldehyde substrates. [vaz2000] Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis (2000). https://pubmed.ncbi.nlm.nih.gov/10702312/ DOI: 10.1074/jbc.275.10.7390
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. Purified BbuB and BbuC together transferred CoA onto gamma-butyrobetaine; neither component alone reproduced the tested activity.

    Emergencia timonensis BbuB CoA-transferase component → Gamma-butyrobetainyl-CoA source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary full-text Figure 3 and enzyme experiments
    experimental_model
    E. timonensis enzymes; recombinant expression and reconstitution.
    limitations
    Acetyl-CoA was preferred among tested donors; in vivo donor use can differ.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    The microbial route first activates its substrate with CoA.
    primary_references
    Elucidation of an anaerobic pathway for metabolism of l-carnitine-derived γ-butyrobetaine to trimethylamine in human gut bacteria. · 2021 · https://pubmed.ncbi.nlm.nih.gov/34362844/ · DOI 10.1073/pnas.2101498118

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 370–376

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · E. timonensis enzymes; recombinant expression and reconstitution. · source_derived_draft · unverified_draft

    ## l-carnitine-bbu-coa The microbial route first activates its substrate with CoA. Purified BbuB and BbuC together transferred CoA onto gamma-butyrobetaine; neither component alone reproduced the tested activity. Model: E. timonensis enzymes; recombinant expression and reconstitution. Limitations: Acetyl-CoA was preferred among tested donors; in vivo donor use can differ. Evidence access: Primary full-text Figure 3 and enzyme experiments Elucidation of an anaerobic pathway for metabolism of l-carnitine-derived γ-butyrobetaine to trimethylamine in human gut bacteria. · 2021 · https://pubmed.ncbi.nlm.nih.gov/34362844/ · DOI 10.1073/pnas.2101498118
    Complete structured claim and evidence

  2. Adding E. timonensis in coculture completed the carnitine-to-TMA conversion using other microbes' gamma-butyrobetaine production.

    Emergencia timonensis → Human gut microbial gamma-butyrobetaine-to-TMA conversion source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Cultured human fecal commensals under anaerobic conditions.
    limitations
    Community capability does not establish the abundance or activity in every person.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    Different microbes can carry out consecutive steps.
    primary_references
    l-Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30530985/ · DOI 10.1172/JCI94601

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 362–368

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Cultured human fecal commensals under anaerobic conditions. · source_derived_draft · unverified_draft

    ## l-carnitine-microbial-coculture Different microbes can carry out consecutive steps. Adding E. timonensis in coculture completed the carnitine-to-TMA conversion using other microbes' gamma-butyrobetaine production. Model: Cultured human fecal commensals under anaerobic conditions. Limitations: Community capability does not establish the abundance or activity in every person. Evidence access: Primary abstract l-Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30530985/ · DOI 10.1172/JCI94601
    Complete structured claim and evidence

  3. Chronic carnitine exposure increased microbial gamma-butyrobetaine-to-TMA conversion; baseline labeled TMAO generation was greater in omnivores.

    L-Carnitine → Human gut microbial gamma-butyrobetaine-to-TMA conversion source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Human isotope challenges before/after at least two months of supplementation.
    limitations
    A metabolite-production study does not prove cardiovascular events from a given supplement dose.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    The response depends partly on microbial adaptation and diet.
    primary_references
    l-Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30530985/ · DOI 10.1172/JCI94601

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 354–360

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Human isotope challenges before/after at least two months of supplementation. · source_derived_draft · unverified_draft

    ## l-carnitine-microbial-induction The response depends partly on microbial adaptation and diet. Chronic carnitine exposure increased microbial gamma-butyrobetaine-to-TMA conversion; baseline labeled TMAO generation was greater in omnivores. Model: Human isotope challenges before/after at least two months of supplementation. Limitations: A metabolite-production study does not prove cardiovascular events from a given supplement dose. Evidence access: Primary abstract l-Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans. · 2019 · https://pubmed.ncbi.nlm.nih.gov/30530985/ · DOI 10.1172/JCI94601
    Complete structured claim and evidence

  4. Adding E. timonensis to defined microbial communities in gnotobiotic mice completed carnitine-to-TMA conversion, raised TMAO and enhanced thrombosis after arterial injury.

    Emergencia timonensis → Gnotobiotic mouse arterial-injury thrombosis potential source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Gnotobiotic mouse transplantation with defined communities.
    limitations
    Not a human clinical-event trial.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    A microbial addition tested a downstream vascular consequence.
    primary_references
    The microbial gbu gene cluster links cardiovascular disease risk associated with red meat consumption to microbiota L-carnitine catabolism. · 2022 · https://pubmed.ncbi.nlm.nih.gov/34949826/ · DOI 10.1038/s41564-021-01010-x

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 402–408

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Gnotobiotic mouse transplantation with defined communities. · source_derived_draft · unverified_draft

    ## l-carnitine-mouse-microbial-thrombosis A microbial addition tested a downstream vascular consequence. Adding E. timonensis to defined microbial communities in gnotobiotic mice completed carnitine-to-TMA conversion, raised TMAO and enhanced thrombosis after arterial injury. Model: Gnotobiotic mouse transplantation with defined communities. Limitations: Not a human clinical-event trial. Evidence access: Primary abstract The microbial gbu gene cluster links cardiovascular disease risk associated with red meat consumption to microbiota L-carnitine catabolism. · 2022 · https://pubmed.ncbi.nlm.nih.gov/34949826/ · DOI 10.1038/s41564-021-01010-x
    Complete structured claim and evidence

  5. Increasing ascorbate supplementation increased carnitine accumulation from gamma-butyrobetaine in primary guinea-pig hepatocytes after four hours.

    L-Ascorbate → Guinea-pig hepatocyte carnitine content source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing.
    experimental_model
    Primary cultured male guinea-pig hepatocyte monolayers
    exposure
    Ascorbate preloading followed by 4-hour gamma-butyrobetaine incubation; precursor range includes 0.05–1.0 mM and 5 mM.
    limitations
    Species-specific cell exposure; accumulation reflects production and other handling, not directly a human dietary dose-response.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Cavia porcellus
    plain_language
    Vitamin C helped isolated liver cells convert a supplied precursor into carnitine.
    primary_references
    [hepatocytes1991] The regulatory effect of ascorbate on the carnitine synthesis in primary cultured guinea pig hepatocytes. (1991). https://pubmed.ncbi.nlm.nih.gov/1765841/ DOI: 10.3177/jnsv.37.371
    tissue_or_cell_type
    Hepatocytes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 702–713

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Primary cultured male guinea-pig hepatocyte monolayers · source_derived_draft · unverified_draft

    ### vc-enzyme-hepatocyte-carnitine Increasing ascorbate supplementation increased carnitine accumulation from gamma-butyrobetaine in primary guinea-pig hepatocytes after four hours. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Vitamin C helped isolated liver cells convert a supplied precursor into carnitine. organism: Cavia porcellus tissue_or_cell_type: Hepatocytes experimental_model: Primary cultured male guinea-pig hepatocyte monolayers limitations: Species-specific cell exposure; accumulation reflects production and other handling, not directly a human dietary dose-response. cross_nutrient: Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing. exposure: Ascorbate preloading followed by 4-hour gamma-butyrobetaine incubation; precursor range includes 0.05–1.0 mM and 5 mM. [hepatocytes1991] The regulatory effect of ascorbate on the carnitine synthesis in primary cultured guinea pig hepatocytes. (1991). https://pubmed.ncbi.nlm.nih.gov/1765841/ DOI: 10.3177/jnsv.37.371
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

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