Grade B
Meta analysis
Vitamin D Supplementation and Immune Function: A Systematic Review
Systematic review examining vitamin D supplementation effects on immune markers and respiratory infection rates.
Published 2024
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[STUDY DETAILS]
- Study Type
- Meta analysis
- Quality Grade
- B
- Publication Year
- 2024
- Category
- Supplements & Compounds
Summary
Analysis of 43 RCTs (n=48,488) found vitamin D supplementation reduced respiratory infection risk by 12% overall, with greater benefits in those with baseline deficiency (<25 nmol/L).
Key Findings
1. 12% reduction in acute respiratory infections
2. 70% reduction in deficient individuals
3. Daily dosing more effective than bolus
4. Optimal range 40-60 ng/mL for immune function