Vitamin D: what the evidence actually shows
surging vitamin D — claims outrun the trial evidence
⚠ Safety in context
- minorwith Magnesium: Magnesium is a cofactor in vitamin D metabolism; the two are complementary.
Evidence by outcome
bone healthgrade Bmoderate certainty— supports bone density and reduces fracture risk with calcium, mainly in deficiency
moodgrade Clow certainty— small mood benefit, mostly in people who are deficient
immune functiongrade Clow certainty— modest reduction in acute respiratory infection risk, concentrated in deficient people
People say · Evidence shows
“Vitamin D fixes almost everything”
aheadlargemarketing claim
Grade history
No grade changes yet. Initial grade assigned; re-reviewed on every 12 months (Grade A/B). Methodology v1.
Re-review cadence: every 12 months (Grade A/B) · methodology v1.
By outcome — the money pages
Compare
- Vitamin D vs St. John's Wort for mood
- Vitamin D vs 5-HTP for mood
- Vitamin D vs Saffron for mood
- Vitamin D vs N-Acetylcysteine for mood
- Vitamin D vs Omega-3 for mood
- Vitamin D vs Creatine for mood
- Vitamin D vs Zinc for mood
- Vitamin D vs Probiotics for mood
- Vitamin D vs Turmeric for mood
- Vitamin D vs Folate for mood
- Vitamin D vs Vitamin C for mood
- Vitamin D vs Myo-Inositol for mood
- Vitamin D vs Magnesium for mood
- Vitamin D vs Rhodiola for mood
- Vitamin D vs Zinc for immune function
- Vitamin D vs Calcium for bone health
- Vitamin D vs Creatine for bone health
More
sources: PMID:20000104 · PMID:20000105
Cite this page
Reuse under CC-BY 4.0 with attribution to evidencebased.info.
Plain-text citation
Substrate. Vitamin D: what the evidence actually shows. https://evidencebased.info/interventions/vitamin-d. Updated 2026.
BibTeX
@misc{substrate_nterventionsvitamind,
author = {Substrate editorial},
title = {Vitamin D: what the evidence actually shows},
year = {2026},
url = {https://evidencebased.info/interventions/vitamin-d},
note = {evidencebased.info}
}