20/02/2026
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Published Today (20 February 2026) - This meta-analysis evaluates the efficacy of Vitamin D supplementation in reducing respiratory tract infections across various age groups and clinical settings globally.
TITLE: EFFICACY OF VITAMIN D SUPPLEMENTATION IN PREVENTING RESPIRATORY TRACT INFECTIONS: A SYSTEMATIC REVIEW AND META-ANALYSIS OF RANDOMIZED CONTROLLED TRIALS
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Ό Link: https://doi.org/10.3389/fnut.2025.1668500
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Ό Key Findings:
ββ Vitamin D supplementation significantly reduces the risk of developing acute respiratory tract infections (ARTIs) compared to placebos.
ββ Daily or weekly dosing schedules proved more effective than large bolus doses for sustained immune system support and infection prevention.
ββ Protective effects were most pronounced in individuals with baseline vitamin D deficiency, specifically those with levels below 25 nmol/L.
ββ The analysis confirms a 12% reduction in the proportion of participants experiencing at least one acute respiratory tract infection.
ββ Benefits were observed across all age groups, including children, adults, and the elderly, highlighting its broad clinical utility.
ββ No significant increase in serious adverse events was reported, suggesting a high safety profile for standard supplementation levels.
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Ό Clinical Relevance
Clinicians should prioritize screening for Vitamin D deficiency as a preventative measure against respiratory illnesses. Regular, low-dose supplementation is superior to intermittent high doses for maintaining mucosal immunity. This provides a cost-effective, low-risk public health strategy to reduce the burden on healthcare systems during peak seasons for respiratory infections.
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