Vitamins & minerals · INGREDIENT PROFILE
Vitamin C
Research topics: Nutrient status · Immune function
Also searched as: vitamin C, ascorbic acid, ascorbate. Names and formulations are not necessarily interchangeable.
01 / MATCH THE FORMULA
The details to pin down.
Ingredient identity & form
Record ascorbic acid or an ascorbate salt and the amount of vitamin C; identify combination formulations.
Dose, duration & study fit
Daily amount, duration, background intake, and the outcome the study actually measured.
Record the tested dose from the original study. A study dose is not a recommended dose or proof that every claim at that dose is supported.
02 / READ IN CONTEXT
What changes the interpretation?
Separate normal physiological function from prevention or treatment claims. Compare baseline intake and the study population.
- Population: Does the study population match your intended audience?
- Comparison: What changed compared with the control group—not just compared with baseline?
- Consistency: Do independent studies agree? Include null findings, limitations, and adverse events.
- Claim wording: Does the measured outcome support the strength and scope of the proposed claim?
03 / FOLLOW THE SOURCES
Research to explore.
A selected index of randomized trials and research reviews. Open the source to verify methods, results, corrections, and applicability.
2026 · Meta-Analysis · Systematic Review
The effect of high-dose of vitamin C on mortality among aged patients with severe COVID-19: A systematic review and meta-analysis. ↗
PMID 42446912 · DOI 10.3138/cim-2024-0302
2026 · Meta-Analysis · Systematic Review · Review
The effect of vitamin C supplementation on blood pressure in adults: an umbrella review of meta-analyses of randomized clinical trials. ↗
PMID 41784995 · DOI 10.1039/d5fo03679h
2026 · Meta-Analysis · Systematic Review · review-article
Effects of Vitamin C and/or E Supplementation on Glycemic Control and Cardiovascular Risk Factors in Type 2 Diabetes: A Systematic Review and Subgroup Meta-analysis. ↗
PMID 41521729 · DOI 10.1093/nutrit/nuaf133 · PMC record available
2026 · Randomized Controlled Trial
Individual oxidative stress and inflammation responses to vitamin C supplementation: Aggregated sets of n-of-1 trials. ↗
PMID 41935704 · DOI 10.1016/j.freeradbiomed.2026.03.073
How these references were selected
First four Europe PMC relevance-ranked MED records matching the recorded ingredient/outcome query and randomized-trial, systematic-review or meta-analysis publication types. No favorable-result filter. Bibliographic discovery only; not a full-text review or exhaustive bibliography.
Captured 2026-10-08: 4 records shown from 856 matching index records. Index counts describe this query, not supporting studies or evidence quality.
(TITLE_ABS:"vitamin C") AND (TITLE_ABS:"supplementation") AND SRC:MED AND (PUB_TYPE:"Randomized Controlled Trial" OR PUB_TYPE:"Systematic Review" OR PUB_TYPE:"Meta-Analysis")Run the recorded index search ↗04 / GO DEEPER
Guidance & source databases.
NIH ODS: Vitamin C↗Database links open a fresh search. Registry entries can identify ongoing or unpublished trials; registration alone is not evidence of benefit.
Educational research navigation. Not individual medical advice, a safety clearance, regulatory approval, or a complete review of this ingredient. Bibliographic snapshot: 2026-10-08.