Vitamin D supplementation meta-analyses

Vitamin D supplementation to prevent asthma exacerbations, COPD exacerbations and respiratory tract infections is a meta-analyses database of trials testing vitamin D supplementation to prevent asthma exacerbations, COPD exacerbations and acute respiratory tract infection, incorporating patient level data for which the relevant permissions for data sharing have been obtained. Asthma from seven randomised controlled trials (RCTs); COPD from four RCTs; acute RTI from 25 RCTs.