Vitamin D is a vital nutrient that plays a significant part in several physiological processes
within the human body, including calcium metabolism, bone health, immune function, and …

Background Low serum 25-hydroxy vitamin D concentration is associated with increased
fracture risk. It is uncertain whether vitamin D supplementation reduces fractures, or whether …

Importance Vitamin D deficiency (defined as 25-hydroxyvitamin D [25 (OH) D]< 20 ng/mL) is
prevalent among children living in temperate climates and has been reported to associate …

Background: Hypothyroidism is common, and in iodine-sufficient areas, it is primarily caused
by autoimmune destruction of the thyroid gland. Observational studies have consistently …

Objectives Observational studies have suggested that a higher 25-hydroxyvitamin D
concentration may be associated with longer telomere length; however, this has not been …

Purpose Observational studies suggest that higher serum 25-hydroxy vitamin D (25 (OH) D)
concentration may be associated with lower risk of cataract. However, no randomized …

Objective To investigate whether supplementing older adults with monthly doses of vitamin
D alters the incidence of major cardiovascular events. Design Randomised, double blind …

Background Evidence suggests that vitamin D influences the immune system. Recent
studies indicate that vitamin D supplementation may reduce the severity of infections, but …

Background Observational studies have consistently found a link between low serum 25‐
hydroxyvitamin D concentration and higher risk of cognitive impairment. Results from …

Observational studies suggest a link between vitamin D and the composition of the gut
microbiome, but there is little evidence from randomized controlled trials of vitamin D …