Abstract
The micronutrient status plays a key role for adequate immune response, including in diseases caused by respiratory viruses. Numerous studies conducted since the beginning of the COVID-19 pandemic, examining the impact of micronutrient availability, have shown their importance in the prevention of this disease. The largest number of publications is devoted to vitamin D. As a result, in less than two years, 17 meta-analyses and analytical reviews were published on the role of vitamin D and the availability of this micronutrient in various population groups in reducing the incidence, incidence of severe forms of COVID-19 and mortality. This review summarizes the results of published meta-analyses and systematic reviews. The analysis of literature data confirms that vitamin D has the highest evidence base as a micronutrient that reduces the risk of disease and the occurrence of severe forms of COVID-19. It also provides up-to-date recommendations on vitamin D supplementation for adult and pediatric patients.