The association of vitamin D with common diseases — an appraisal of recent evidence

Abstract

It has been several years since the discovery of the pleiotropic effects of vitamin D, and there is still hot debate as to the role of vitamin D and attempts to standardise methods of determining 25(OH)D concentrations as well as supplementation with vitamin D. Many studies, both observational and randomised controlled trials, have revealed a whole range of opportunities of active vitamin D metabolite contribution to the treatment of common diseases. A relationship between high concentrations of vitamin D and a low risk of incidence of colorectal cancer, cardiovascular diseases, hypertension, ischaemic stroke, depression,metabolic syndrome and type 2 diabetes has been suggested for a long time, although recently published meta-analyses have created some doubts. There is no consensus regarding vitamin D supplementation and the optimum concentration of serum 25(OH)D. The Institute of Medicine’s 2011 report recommends achieving serum 25(OH)D concentration of 20 ng/mL as optimal, at a dosage of 600 IU of vitamin D per day. International recommendations suggest for individuals at risk a dosage of vitamin D of 2,000 IU per day. Polish experts advise that the optimal concentration of 25(OH)D should be greater than 30 ng/mL for adults.