New research suggests that the risk of cardiovascular disease could be predicted by measuring levels of total and bioavailable vitamin D in both men and women. The study analyzed the vitamin D levels of 4,200 individuals aged 52-76 and assessed whether vitamin D levels had any effect on future cardiac events. The findings revealed that individuals with low levels of both total vitamin D and bioavailable vitamin D were at the greatest risk for heart attack, stroke, heart failure, and even cardiovascular death. American College of Cardiology, April 2016