A new clinical study, published in the journal The BMJ, finds that vitamin D supplements do not provide protection against acute respiratory infections or a SARS-COV-2 infection.
The study was conducted by researchers from the Queen Mary University of London, UK, where they enrolled 6,200 people ages 16 and over who were not currently taking vitamin D supplements. The researchers performed a blood analysis of their vitamin D levels. Then, they administered either a low or high dose of vitamin D to the study participants.
After a follow-up period that continued 6 months, scientists found at least one acute respiratory tract infection of any cause occurred in 5.7% of the low-dose vitamin D supplement group and 5% in the higher-dose group. Also, 3.6% of participants in the low-dose vitamin D group and 3% in the higher-dose group developed COVID-19, compared to 2.6% of participants not offered a vitamin D supplement.