Are we overrating the extra-skeletal benefits of oral vitamin D supplementation?

Vitamin D (Vit D) is a fat-soluble hormone poorly present in food, which is endogenously produced mainly through the biological conversion of its precursors into the biologically active form (1,25-dihydroxy-cholecalciferol) triggered by ultraviolet radiation exposure from either sunlight or, less frequently, indoor tanning (1).