Vitamin D deficiency (serum 25-hydroxyvitamin D (25 (OH) D)< 50 nmol/L or 20 ng/mL) is
common in Europe and the Middle East. It occurs in< 20% of the population in Northern …

Vitamin D status and the prevalence of vitamin D deficiency and insufficiency have been
addressed in many studies covering all continents. Vitamin D deficiency, defined as a serum …

Background Evidence recommends that vitamin D might be a crucial supportive agent for
the immune system, mainly in cytokine response regulation against COVID‐19. Hence, we …

The WHO has announced the novel coronavirus disease (COVID-19) outbreak to be a
global pandemic. The distribution of community outbreaks shows seasonal patterns along …

Several studies conducted around the world showed substantial vitamin D insufficiency and
deficiency among different population groups. Sources of vitamin D in the human body …

Vitamin D is necessary for maintaining and regulating calcium levels; thus, insufficiency of
vitamin D increases the risk of many chronic diseases. This study aimed to examine vitamin …

Background Lack of sun exposure is one of the primary causes of epidemic vitamin D
deficiency worldwide. The aim of this study was to investigate vitamin D status and seasonal …

Background The aim of the study was to determine the serum vitamin D levels in patients
with psoriatic arthritis (PsA) and compare it with patients with rheumatoid arthritis (RA) and …

Vitamin D is beneficial for maintaining good health; however, there is a lack of nationally
representative data reported, particularly in older adults. To better understand the nutritional …

Background: Some studies have demonstrated that higher baseline plasma levels of 25-
hydroxivitamin D [25 (OH) D] are associated with a significant reduction in colorectal cancer …