To assess the evidence on SARS-CoV2 infection and Covid-19 in relation to deficiency and
supplementation of vitamin D, we conducted a systematic review up to April 2021. We …

Background vitamin D influences the immune system and the inflammatory response. It is
known that vitamin D supplementation reduces the risk of acute respiratory tract infection. In …

As the world's attention has been riveted upon the growing COVID-19 pandemic, many
researchers have written brief reports supporting the hypothesis that vitamin D deficiency is …

Background: Vitamin D has diverse and extensive effects on the immune system, including
activating innate immunity and reducing the overactive adaptive immune response. A …

Vitamin D has an immune-modulating effect on respiratory tract infections. For this reason, it
has been proposed as part of the treatment in COVID-19. Furthermore, vitamin D deficiency …

Robust evidence of whether vitamin D deficiency is associated with COVID-19 infection and
its severity is still lacking. The aim of the study was to evaluate the association between …

Structured abstract Importance Vitamin D deficiency increases the incidence of respiratory
virus infections. More than 1 billion people worldwide are vitamin D deficient. If vitamin D …

INTRODUCTION Vitamin D and COVID-19 A growing number of concordant reports support
a protective role for vitamin D in reducing at least the risk/severity of respiratory tract …

Speculative hypotheses and observational data have suggested a protective role of vitamin
D in COVID-19. However, many unanswered questions remain, aberrant detrimental effects …

Abstract Purpose of Review In the midst of the COVID-19 pandemic, several academic
studies have emerged that explore the importance of vitamin D in the development of the …