Studies have found that vitamin D plays an important role in mediating immune function via a number of pathways, including enhancing the release of antimicrobial peptides in your skin.
New research now shows that low serum vitamin D levels increase the risk of nasal carriage of methicillin-resistant Staphylococcus aureus (MRSA). An estimated 2.7 million people in the U.S. are MRSA nasal carriers.
The relationship held even after adjusting for age, race, recent antibiotic usage, recent hospitalization, and poverty. This means that vitamin D status could be a modifiable risk factor for MRSA carriage and potentially MRSA infection.