Component
Human urinary 3-hydroxyisovalerylcarnitine excretion
Human urinary 3-hydroxyisovalerylcarnitine excretion. Species, exposure and limitations are retained in each linked claim.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
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.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
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.
What acts on it
Challenge-induced urinary 3-hydroxyisovalerylcarnitine rose more than twofold by day 14 in both biotin-depleted cohorts.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- evidence_span
- {"source_cache": "artifacts/biotin-research/21918059.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5cf1d7e25ae7bdfeb2ac3225cee8e4e660723d5197fc057f63327b3ad9eb3aaf", "start_char": 0, "end_char": 1723, "text_sha256": "5cf1d7e25ae7bdfeb2ac3225cee8e4e660723d5197fc057f63327b3ad9eb3aaf"}
- experimental_model
- Leucine challenge during biotin depletion in two cohorts of 5 and 7 healthy adults
- exposure
- 28-day egg-white depletion; weekly oral leucine challenge
- limitations
- The challenge was sensitive but not diagnostically superior to 24-hour urine measurements; no validated universal threshold follows.
- nutrient_topic
- Biotin research collection; topical membership is not evidence of a direct dietary effect. · Biotin
- organism
- Homo sapiens
- plain_language
- The carnitine-linked side product also increased as biotin became limited.
- primary_references
- [b7-p21918059] Urinary excretion of 3-hydroxyisovaleric acid and 3-hydroxyisovaleryl carnitine increases in response to a leucine challenge in marginally biotin-deficient humans. (2011). https://pubmed.ncbi.nlm.nih.gov/21918059/ DOI: 10.3945/jn.111.146126
- tissue_or_cell_type
- Urine
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Biotin: carboxylases, recycling, deficiency and nutrient interactions (2026-09-17) · lines 923–934
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Leucine challenge during biotin depletion in two cohorts of 5 and 7 healthy adults · source_derived_draft · unverified_draft
### b7-leucine-challenge-c5oh Challenge-induced urinary 3-hydroxyisovalerylcarnitine rose more than twofold by day 14 in both biotin-depleted cohorts. Condition category: nutrient_deficiency nutrient_topic: Biotin research collection; topical membership is not evidence of a direct dietary effect. plain_language: The carnitine-linked side product also increased as biotin became limited. organism: Homo sapiens tissue_or_cell_type: Urine experimental_model: Leucine challenge during biotin depletion in two cohorts of 5 and 7 healthy adults limitations: The challenge was sensitive but not diagnostically superior to 24-hour urine measurements; no validated universal threshold follows. exposure: 28-day egg-white depletion; weekly oral leucine challenge evidence_span: {"source_cache": "artifacts/biotin-research/21918059.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5cf1d7e25ae7bdfeb2ac3225cee8e4e660723d5197fc057f63327b3ad9eb3aaf", "start_char": 0, "end_char": 1723, "text_sha256": "5cf1d7e25ae7bdfeb2ac3225cee8e4e660723d5197fc057f63327b3ad9eb3aaf"} [b7-p21918059] Urinary excretion of 3-hydroxyisovaleric acid and 3-hydroxyisovaleryl carnitine increases in response to a leucine challenge in marginally biotin-deficient humans. (2011). https://pubmed.ncbi.nlm.nih.gov/21918059/ DOI: 10.3945/jn.111.146126
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.