Component

Guinea-pig carnitine synthesis estimated from urinary output

Precursor-loading estimate based on measured carnitine excretion, not direct intracellular enzyme flux.

2 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 acts on it

  1. 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

  2. Oral trimethyllysine increased urine-based estimated carnitine synthesis by 32–40 micromol/kg/day across ascorbate-replete, deficient and pair-fed guinea-pig groups; vitamin C deficiency did not abolish the precursor response.

    Free N-epsilon-trimethyl-L-lysine → 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 754–765

    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-tml-response Oral trimethyllysine increased urine-based estimated carnitine synthesis by 32–40 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

In the sources

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

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

    Evidence, AI assistance and curation standards