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- Vitamin D plays an important role in maintaining immune function.
- This study investigated the association between serum vitamin D levels and the risk of SARS-CoV-2 and influenza infection among healthcare workers, 96% of whom had received a COVID-19 vaccine and 88% an influenza vaccine.
- No association was found between serum vitamin D and the risk of SARS-CoV-2 or influenza infection.
- Among vaccinated individuals, higher vitamin D levels may not confer additional protection against the SARS-CoV-2 and influenza infection.
This study was published in Clinical Nutrition ESPEN (2025;68:263–266).