Vitamin D and Reduced Tumor Necrosis Factor Alpha

Research synthesisModerate evidenceMixed effect size5 studies · 3 beneficial · 2 neutral · 0 harmful

Across 5 studies, 3 reported beneficial effects (small to moderate magnitude) of vitamin D supplementation on reducing tumor necrosis factor alpha (TNF-α) levels, while 2 found neutral effects. The beneficial findings come from systematic reviews and meta-analyses in populations including depression patients, overweight/obese individuals, and those with chronic pruritus. Doses ranged from 1000 to 5000 IU/day where reported, but most studies did not specify dose or duration.

Studied populations: depression patients, overweight/obese adults, individuals with chronic pruritus

Caveats: Two studies found neutral effects in overweight/obese children and older adults with vitamin D deficiency, suggesting benefit may depend on population and baseline status. One beneficial study combined vitamin D with magnesium, so the effect cannot be solely attributed to vitamin D. Effect sizes were small to moderate, and clinical significance remains uncertain. Most studies did not report supplementation duration, limiting interpretability.

Generated Jul 12, 2026

Doses used in studies

IU/day: 1,000–5,000 (median 3,000, IQR 2,000–4,000) — 2 studies

Time to effect

Median: 8 weeks · IQR 8 weeks–8 weeks · Range 8 weeks–8 weeks — Reported in 1 of 5 studies

5 of 5 papersPopulation:

Efficacy of vitamin D supplementation in patients diagnosed with depression: a dose-response meta-analysis of randomized controlled trials.
- 2026-03-17
- Systematic Review · n = 962
- Frontiers in nutrition 13
- - Hsuan-Hsien Liu
  - Ting-Hui Liu
  - Chia-Yu Liu
  - Jheng-Yan Wu
  - Chien-Ho Lin
  - Chih-Cheng Lai
- PubMed: 41923913
- DOI: 10.3389/fnut.2026.1772451
6 Insights on
- Reduced Tumor Necrosis Factor Alpha
- High evidence
and TNFα levels (MD: -0.3; 95% CI - 0.44 to -0.16 pg./mL) in the intervention groups
Effect
Beneficial
Effect size
Small
Significant
Yes
Dose
up to 5,000 IU/day
The effects of magnesium and vitamin D/E co-supplementation on inflammation markers and lipid metabolism of obese/overweight population: a systematic review and meta-analysis.
- 2025-09-01
- Systematic Review · n = 509
- Frontiers in nutrition 12
- - Kai Deng
  - Jiamei Liu
  - Ye Miao
  - Guanqi Wang
  - Xingli Wang
  - Shengye Liu
  - Liyu Yang
- PubMed: 40959697
- DOI: 10.3389/fnut.2025.1563604
2 Insights on
- Reduced Tumor Necrosis Factor Alpha
- High evidence
- Clinical
The combination of magnesium and vitamin D significantly reduced tumor necrosis factor-α (TNF-α) levels (MD: -0.87, 95%CI: -1.62, -0.11, p = 0.02).
Effect
Beneficial
Effect size
Moderate
Significant
Yes
Evaluating the Role of Vitamin D in Alleviating Chronic Pruritus: A Meta-Analysis.
- 2024-09-16
- Meta-Analysis
- International journal of molecular sciences 25(18)
- - Chen-Pi Li
  - Shin-Chuan Huang
  - Yao Hsiao
  - Ru-Yin Tsai
- PubMed: 39337471
- DOI: 10.3390/ijms25189983
5 Insights on
- Reduced Tumor Necrosis Factor Alpha
- High evidence
- Rigorous Journal
levels of inflammatory cytokines, including tumor necrosis factor (TNF), interleukin-6 (IL-6), and high-sensitivity C-reactive protein (hs-CRP), compared to controls
Effect
Beneficial
Effect size
Moderate
Significant
Yes
Effects of Vitamin D3 Supplementation on Inflammatory Markers in Overweight and Obese Children and Adolescents: A Systematic Review.
- 2025-07-20
- Review · n = 294
- Life (Basel, Switzerland) 15(7)
- - Maria Krajewska
  - Ewelina Witkowska-Sędek
- PubMed: 40724644
- DOI: 10.3390/life15071142
5 Insights on
- Reduced Tumor Necrosis Factor Alpha
- High evidence
- Children
We found that vitamin D3 supplementation did not affect the changes in ... tumor necrosis factor-α (TNF-α)
Effect
Neutral
Effect size
Small
Significant
No
Co-administration of vitamin D and N-acetylcysteine to modulate immunosenescence in older adults with vitamin D deficiency: a randomized clinical trial.
- 2025-05-12
- RCT
- Frontiers in immunology 16
- - Samira Rastgoo
  - Katayoun Pourvali
  - Seyed Ahmad Raeissadat
  - Ghazaleh Eslamian
  - Hamid Zand
- PubMed: 40421021
- DOI: 10.3389/fimmu.2025.1570441
6 Insights on
- Reduced Tumor Necrosis Factor Alpha
- High evidence
- Clinical
No significant differences were observed between the groups in serum ... (no serum TNF-α reported; if not measured, then exclude). Given the ambiguity, I will only include outcomes explicitly measured. The abstract states: "No significant differences were observed between the groups in serum IL-6, C-reactive protein (CRP), or the neutrophil-to-lymphocyte ratio (NLR)". TNF-α was only measured at gene expression level, not serum. So I will not infer a neutral serum TNF-α outcome.
Effect
Neutral
Effect size
Small
Significant
No
Dose
600 mg daily

Vitamin D and Reduced Tumor Necrosis Factor Alpha

Efficacy of vitamin D supplementation in patients diagnosed with depression: a dose-response meta-analysis of randomized controlled trials.

The effects of magnesium and vitamin D/E co-supplementation on inflammation markers and lipid metabolism of obese/overweight population: a systematic review and meta-analysis.

Evaluating the Role of Vitamin D in Alleviating Chronic Pruritus: A Meta-Analysis.

Effects of Vitamin D3 Supplementation on Inflammatory Markers in Overweight and Obese Children and Adolescents: A Systematic Review.

Co-administration of vitamin D and N-acetylcysteine to modulate immunosenescence in older adults with vitamin D deficiency: a randomized clinical trial.