Background In the 5 years that have passed since the publication of the 2018 International
Consensus Statement on Allergy and Rhinology: Allergic Rhinitis (ICAR‐Allergic Rhinitis …

The principal source of vitamin D in humans is its biosynthesis in the skin through a
chemical reaction dependent on sun exposure. In lesser amounts, the vitamin can be …

COVID-19 is characterized by marked variability in clinical severity. Vitamin D had recently
been reviewed as one of the factors that may affect the severity in COVID-19. The objective …

A well-functioning immune system is critical for survival. The immune system must be
constantly alert, monitoring for signs of invasion or danger. Cells of the immune system must …

Ever since its discovery by Windhaus, the importance of the active metabolite of vitamin D (1,
25-dihydroxyvitamin D 3; 1, 25-(OH) 2D 3) has been ever expanding. In this review, the …

The etiology of endemic rickets was discovered a century ago. Vitamin D is the precursor of
25-hydroxyvitamin D and other metabolites, including 1, 25 (OH) 2D, the ligand for the …

It is well-established that the nutritional deficiency or inadequacy can impair immune
functions. Growing evidence suggests that for certain nutrients increased intake above …

Background: Open Access Editor's Choice Systematic Review COVID-19 Mortality Risk
Correlates Inversely with Vitamin D3 Status, and a Mortality Rate Close to Zero Could …

1, 25-Dihydroxvitamin D3 [1, 25 (OH) 2D3] is the hormonally active form of vitamin D. The
genomic mechanism of 1, 25 (OH) 2D3 action involves the direct binding of the 1, 25 (OH) …

The first incidence of COVID-19 was reported in the Wuhan city of Hubei province in China
in late December 2019. Because of failure in timely closing of borders of the affected region …