{"id":"4af952e1-a2ef-5309-87d4-15ebe7e9597f","stable_key":"cb568d28-484a-5c2e-9fcc-2d780358e514:c-oral-iv-measured-peaks","predicate":"intravenous_route_produces_higher_measured_peak","statement":"At the same measured 1.25-g dose, mean peak plasma vitamin C was 134.8 ± 20.6 micromol/L orally versus 885 ± 201.2 micromol/L intravenously.","claim_class":"observational","status":"source_derived_draft","evidence_grade":"ungraded","direction":"positive","is_public":true,"mechanism_event_id":"2f867252-2507-5a10-a9b9-64e4b0114aea","mechanism_event_label":"Bypassing the gut produced a much larger blood peak for the same administered amount.","subject":{"id":"2047867f-9872-53b2-a553-71c911d0695b","slug":"ascorbic-acid","display_name":"L-Ascorbic acid","entity_type_key":"small_molecule"},"object":{"id":"82e3e6b4-3f0f-5fee-b37f-d076185d7b72","slug":"plasma-ascorbate-concentration","display_name":"Plasma ascorbate concentration","entity_type_key":"cellular_process"},"evidence_count":1,"mechanism_event":{"id":"2f867252-2507-5a10-a9b9-64e4b0114aea","stable_key":"cb568d28-484a-5c2e-9fcc-2d780358e514:c-oral-iv-measured-peaks-event","event_type":"observed_intervention","label":"Bypassing the gut produced a much larger blood peak for the same administered amount.","description":"At the same measured 1.25-g dose, mean peak plasma vitamin C was 134.8 ± 20.6 micromol/L orally versus 885 ± 201.2 micromol/L intravenously.","status":"provisional","compartment":null,"participants":[{"entity":{"id":"2047867f-9872-53b2-a553-71c911d0695b","slug":"ascorbic-acid","display_name":"L-Ascorbic acid","entity_type_key":"small_molecule"},"role":"subject","stoichiometry":null,"state_label":"","sequence_order":0,"notes":""},{"entity":{"id":"82e3e6b4-3f0f-5fee-b37f-d076185d7b72","slug":"plasma-ascorbate-concentration","display_name":"Plasma ascorbate concentration","entity_type_key":"cellular_process"},"role":"target","stoichiometry":null,"state_label":"","sequence_order":1,"notes":""}]},"contexts":[{"dimension":"experimental_model","value_text":"Seventeen healthy hospitalized volunteers; measured dose/concentration experiments plus pharmacokinetic modeling.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"exposure","value_text":"Measured oral/IV doses 0.015–1.25 g; modeled doses 1–100 g. Larger modeled exposures were not validated in cancer patients.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"Healthy-volunteer pharmacokinetics, not evidence of cancer efficacy.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"nutrient_topic","value_text":"Vitamin C research collection; topical membership is not evidence of a direct dietary effect.","comparator":null,"unit":null,"notes":"","entity":{"slug":"vitamin-c","display_name":"Vitamin C","entity_type_key":"chemical_species"}},{"dimension":"organism","value_text":"Homo sapiens","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"plain_language","value_text":"Bypassing the gut produced a much larger blood peak for the same administered amount.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"[c-padayatty2004] Vitamin C pharmacokinetics: implications for oral and intravenous use (2004). https://pubmed.ncbi.nlm.nih.gov/15068981/ DOI: 10.7326/0003-4819-140-7-200404060-00010","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"tissue_or_cell_type","value_text":"Human blood or whole-person endpoints","comparator":null,"unit":null,"notes":"","entity":null}],"evidence":[{"id":"5b0f138a-f3f0-5ad1-b168-02cd7e14ba60","evidence_kind":"source_excerpt","locator":"Lines 1469-1479","start_line":1469,"end_line":1479,"excerpt":"### c-oral-iv-measured-peaks\nAt the same measured 1.25-g dose, mean peak plasma vitamin C was 134.8 ± 20.6 micromol/L orally versus 885 ± 201.2 micromol/L intravenously.\nCondition category: normal\nnutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect.\nplain_language: Bypassing the gut produced a much larger blood peak for the same administered amount.\norganism: Homo sapiens\ntissue_or_cell_type: Human blood or whole-person endpoints\nexperimental_model: Seventeen healthy hospitalized volunteers; measured dose/concentration experiments plus pharmacokinetic modeling.\nlimitations: Healthy-volunteer pharmacokinetics, not evidence of cancer efficacy.\nexposure: Measured oral/IV doses 0.015–1.25 g; modeled doses 1–100 g. Larger modeled exposures were not validated in cancer patients.\n[c-padayatty2004] Vitamin C pharmacokinetics: implications for oral and intravenous use (2004). https://pubmed.ncbi.nlm.nih.gov/15068981/ DOI: 10.7326/0003-4819-140-7-200404060-00010","model_system":"Seventeen healthy hospitalized volunteers; measured dose/concentration experiments plus pharmacokinetic modeling.","directness":"author_interpretation","verification_status":"source_derived_draft","notes":"Exact curation-document quotation, not publisher quotation. Study references: [c-padayatty2004] Vitamin C pharmacokinetics: implications for oral and intravenous use (2004). https://pubmed.ncbi.nlm.nih.gov/15068981/ DOI: 10.7326/0003-4819-140-7-200404060-00010","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"fa811221-13bd-5c10-adc1-eaf097c7703c","stable_key":"import-cb568d28-484a-5c2e-9fcc-2d780358e514","title":"Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17)","document_type":"imported_text","citation_label":"AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text.","file_path":"","sha256":"b7fd83f956abb81855f2ea23199ba14e465cd91f4a2ac560277ec21ddafd7bfc","revision_id":"6cde9bbb-d712-5746-82a6-85b144253efa","review_status":"unverified_draft","notes":""}}],"relations":[],"conflicts":[],"corrections":[],"research":null}