Vitamin D can prevent the flu
5.0Limited
evidence
evidence
The Claim
Many people believe that taking Vitamin D can completely prevent the flu and other respiratory infections, attributing this to its immune-boosting properties.
Origin
This myth has emerged from studies suggesting a correlation between Vitamin D levels and respiratory illness incidence, leading to a belief in its preventive capabilities.
What Science Says
While evidence indicates that adequate Vitamin D levels may reduce the risk of respiratory infections, it is not a guaranteed preventive measure. A systematic review found that Vitamin D supplementation can reduce the risk of acute respiratory infections in those who are deficient, but the overall effect in the general population is modest (relative risk reduction around 10-20%).
Verdict
Partially True
Sources
- PMID:19491064 Vitamin D for treatment and prevention of infectious diseases: a systematic review of randomized controlled trials.
- PMID:33472840 Effect of micronutrient supplements on influenza and other respiratory tract infections among adults: a systematic review and meta-analysis.
- PMID:35071300 Association Between Vitamin D and Influenza: Meta-Analysis and Systematic Review of Randomized Controlled Trials.