Vitamin D3 supplementation: Response and predictors of vitamin D3 metabolites – A randomized controlled trial

Large parts of the population are insufficiently supplied with vitamin D, in particular when endogenous synthesis is absent. Therefore many health care providers recommend the use of vitamin D supplements. The current study aimed to investigate the efficacy of an once-daily oral dose of 20 μg vitamin D3 to improve the vitamin D status and to evaluate predictors of response.The study was conducted as a double-blind, randomized, placebo-controlled...