Vitamin D and the landscape for the ideal study design to measure cancer preventive effects

With growing global prosperity, it seems paradoxical that many people worldwide should have a vitamin deficiency. And yet, vitamin D deficiency is a growing public health problem in many countries. Suboptimal vitamin D levels, defined as below 50nmol/L, have been found in as many as 60% of people in European countries [1] and 42% in […]