Vitamin D Supplementation to Prevent Acute Respiratory Infections: Systematic Review and Meta-Analysis of RCTs Abstract Background A 2017 meta-analysis of data from 25 randomized controlled trials ($\text{RCTs}$) of vitamin D suppl... Immunity Vitamin D The Effect of Vitamin D Supplementation on Depression: A Systematic Review and Dose–Response Meta-Analysis of RCTs Abstract Background The impact of vitamin D supplementation on depressive symptoms remains uncertain. This study aimed t... Mood Vitamin D Effect of Vitamin D Supplementation on Immunity in Respiratory Infections and Inflammation: Systematic Review and Meta-Analysis Abstract Background Vitamin D acts as an immune modulator by downregulating the production of inflammatory immune marker... Immunity Vitamin D