Vitamin D and Reduced Oxidative Stress

Research synthesisLow evidenceMixed effect size3 studies · 3 beneficial · 0 neutral · 0 harmful

Across 3 studies, all 3 reported beneficial effects of vitamin D on reducing oxidative stress, with 2 statistically significant findings. The predominant effect size was mixed (ranging from small to large). The median study duration was 56 days, and the most-studied dose was 50,000 IU/week in a clinical population of multiple sclerosis patients.

Effective dose range: 50,000 IU/week
Studied populations: patients with multiple sclerosis

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed).

Generated Jun 11, 2026

Doses used in studies

IU/week: 50,000 (median 50,000, IQR 50,000–50,000) — 1 study

Time to effect

Median: 8 weeks · IQR 8 weeks–8 weeks · Range 8 weeks–8 weeks — Reported in 1 of 3 studies

Safety in these studies

Overall tolerabilityReported
The neuroprotective role of vitamin D suggests the potential benefit of vitamin supplementation in slowing the progression of such conditions and promoting brain health.
from: Vitamin D and Brain Health.

3 of 3 papersPopulation:

Vitamin D3 Supplementation Modulates Inflammatory Protein CHI3L1/YKL-40 and Oxidative Stress Status in Multiple Sclerosis.
- 2025-11-23
- Clinical Trial · n = 35
- Neuropsychopharmacology reports 45(4)
- - Sevda Asadpour
  - Mehrdokht Mazdeh
  - Jamshid Karimi
  - Iraj Khodadadi
  - Gholamreza Shafiee
- PubMed: 41277171
- DOI: 10.1002/npr2.70076
11 Insights on
- Reduced Oxidative Stress
- High evidence
- Clinical
oxidative stress was reduced, evidenced by lower TOS (1.55±0.50 to 0.59±0.23 mmol H2O2 equiv./L; p<0.001).
Effect
Beneficial
Effect size
Large
Significant
Yes
Dose
50 000 IU/week
Consumption of a Probiotic Blend with Vitamin D Improves Immunity, Redox, and Inflammatory State, Decreasing the Rate of Aging-A Pilot Study.
- 2024-10-25
- Clinical Trial · n = 14
- Biomolecules 14(11)
- - Judith Félix
  - Adriana Baca
  - Luz Taboada
  - Guillermo Álvarez-Calatayud
  - Mónica De la Fuente
- PubMed: 39595538
- DOI: 10.3390/biom14111360
4 Insights on
- Reduced Oxidative Stress
- Moderate evidence
decreases the oxidative ... state
Effect
Beneficial
Effect size
Small
Significant
Yes
Vitamin D and Brain Health.
- 2026-01-01
- Review
- Advances in experimental medicine and biology 1493
- - Rahnuma Ahmad
  - Kona Chowdhury
  - Susmita Sinha
  - Mainul Haque
- PubMed: 41219598
- DOI: 10.1007/978-3-032-04357-3_5
4 Insights on
- Reduced Oxidative Stress
- Low evidence
Studies have noted the role of vitamin D in the formation of antioxidants, reduction of pro-inflammatory cytokines, lowering of oxidative stress, improvement of mitochondrial respiratory health, and slowing of the progression of neuronal damage.
Effect
Beneficial
Effect size
Small

Vitamin D and Reduced Oxidative Stress

Vitamin D3 Supplementation Modulates Inflammatory Protein CHI3L1/YKL-40 and Oxidative Stress Status in Multiple Sclerosis.

Consumption of a Probiotic Blend with Vitamin D Improves Immunity, Redox, and Inflammatory State, Decreasing the Rate of Aging-A Pilot Study.

Vitamin D and Brain Health.