Vitamin D and Prostate Cancer

Much has been written lately about the role of vitamin D in the prevention of many cancers, including prostate cancer (PCa) and also in potentially slowing cancer progression. However, before discussing this further, it should be noted that there are countervailing studies that cast doubt on the efficacy of vitamin D and at least one study that claims it can actually be harmful.

Before going further, let's define what vitamin D is. From the Wiki article ():