Vitamin C: what the evidence actually shows
debunked vitamin C for colds — popular belief, evidence says otherwise
Evidence by outcome
skingrade Clow certainty— topical better-supported than oral; oral may support collagen synthesis
cold preventionstudied, no effectmoderate certainty— no reduction in cold incidence in the general population
moodstudied, no effectmoderate certainty— Not recommended for unipolar depression
People say · Evidence shows
“Vitamin C prevents colds”
contradictsextremefolk
What it probably doesn't do
- Vitamin C for cold prevention — Grade —, no reduction in cold incidence in the general population.
- Vitamin C for mood — Grade —, Not recommended for unipolar depression.
Grade history
- C → null-resultMeta-analysis confirmed no prevention benefit in the general population; regraded to null-result. details →
Re-review cadence: every 6 months (Grade C+) · next scheduled by · methodology v1.
By outcome — the money pages
Compare
- Vitamin C vs Vitamin D for mood
- Vitamin C vs St. John's Wort for mood
- Vitamin C vs 5-HTP for mood
- Vitamin C vs Saffron for mood
- Vitamin C vs N-Acetylcysteine for mood
- Vitamin C vs Omega-3 for mood
- Vitamin C vs Creatine for mood
- Vitamin C vs Zinc for mood
- Vitamin C vs Probiotics for mood
- Vitamin C vs Turmeric for mood
- Vitamin C vs Folate for mood
- Vitamin C vs Myo-Inositol for mood
- Vitamin C vs Magnesium for mood
- Vitamin C vs Rhodiola for mood
- Vitamin C vs Zinc for cold prevention
- Vitamin C vs Collagen for skin
- Vitamin C vs Zinc for skin
More
sources: PMID:42095579 · PMID:35311615
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Reuse under CC-BY 4.0 with attribution to evidencebased.info.
Plain-text citation
Substrate. Vitamin C: what the evidence actually shows. https://evidencebased.info/interventions/vitamin-c. Updated 2026-04-12.
BibTeX
@misc{substrate_nterventionsvitaminc,
author = {Substrate editorial},
title = {Vitamin C: what the evidence actually shows},
year = {2026},
url = {https://evidencebased.info/interventions/vitamin-c},
note = {evidencebased.info}
}