Component
Fasting plasma methylmalonic acid concentration
Fasting plasma methylmalonic acid concentration. 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
Metformin-treated patients had depressed cobalamin levels and elevated fasting methylmalonic acid and homocysteine levels.
Experimental context and source evidence
- availability_state
- biomarker_context Imported condition classification; unverified.
- evidence_span
- {"source_cache": "artifacts/metformin-research/19846797.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "801079bb07e94e223a1d7bd7fc99c9f229320aa56b6afa11700765f481558b33", "start_char": 0, "end_char": 1789, "text_sha256": "801079bb07e94e223a1d7bd7fc99c9f229320aa56b6afa11700765f481558b33"}
- experimental_model
- Prospective case-control study of 122 people with type 2 diabetes and symptomatic neuropathy
- exposure
- More than six months of metformin versus no metformin exposure
- limitations
- Case-control design with nerve conduction studies. Cumulative dose correlated with severity, but the design cannot establish that the drug caused the neuropathy.
- nutrient_topic
- Metformin research collection; topical membership is not evidence of a direct clinical effect, and pharmacological exposure is not dietary intake. · Metformin
- organism
- Human
- plain_language
- The marker that rises specifically when B12 is short also rose.
- primary_references
- [metformin-p19846797] Association of metformin, elevated homocysteine, and methylmalonic acid levels and clinically worsened diabetic peripheral neuropathy. (2010). https://pubmed.ncbi.nlm.nih.gov/19846797/ DOI: 10.2337/dc09-0606
- tissue_or_cell_type
- Peripheral nerve
- trigger_kind
- biomarker_context Imported condition classification; unverified.
Metformin: transport, molecular targets, gut mechanisms and nutrient interactions (2026-09-19) · lines 1204–1215
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Prospective case-control study of 122 people with type 2 diabetes and symptomatic neuropathy · source_derived_draft · unverified_draft
### metformin-mma-elevation Metformin-treated patients had depressed cobalamin levels and elevated fasting methylmalonic acid and homocysteine levels. Condition category: biomarker_context nutrient_topic: Metformin research collection; topical membership is not evidence of a direct clinical effect, and pharmacological exposure is not dietary intake. plain_language: The marker that rises specifically when B12 is short also rose. organism: Human tissue_or_cell_type: Peripheral nerve experimental_model: Prospective case-control study of 122 people with type 2 diabetes and symptomatic neuropathy limitations: Case-control design with nerve conduction studies. Cumulative dose correlated with severity, but the design cannot establish that the drug caused the neuropathy. exposure: More than six months of metformin versus no metformin exposure evidence_span: {"source_cache": "artifacts/metformin-research/19846797.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "801079bb07e94e223a1d7bd7fc99c9f229320aa56b6afa11700765f481558b33", "start_char": 0, "end_char": 1789, "text_sha256": "801079bb07e94e223a1d7bd7fc99c9f229320aa56b6afa11700765f481558b33"} [metformin-p19846797] Association of metformin, elevated homocysteine, and methylmalonic acid levels and clinically worsened diabetic peripheral neuropathy. (2010). https://pubmed.ncbi.nlm.nih.gov/19846797/ DOI: 10.2337/dc09-0606
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.