Impact of Level of Vitamin D in the Body on the Severity of COVID-19 – Review of the Literature

This literature review, published in Przegląd Epidemiologiczny in 2020, examines the association between vitamin D levels and the severity of COVID-19. The authors analyzed various studies indicating that low serum 25(OH)D concentrations correlate with increased severity of COVID-19 outcomes, including higher hospitalization rates, ICU admissions, and mortality. The proposed mechanisms