Johns Hopkins scientists suggested that vitamin D may stop conferring cardiovascular benefits and could actually cause harm as levels in the blood rise above the low end of what is considered normal.
Using data from more than 15,000 participants in a National Health and Nutrition Examination Survey, taken from 2001-2006, researchers found a negative relationship between vitamin D and c-reactive protein (CRP) in adults with low vitamin D without cardiovascular symptoms. The study will be published in the January 15 issue of the American Journal of Cardiology.
The findings found that increasing levels of vitamin D in the blood are linked with lower levels of a popular marker for cardiovascular inflammation c-reactive protein (also known as CRP), said study leader Muhammad Amer, M. D., an assistant professor in the division of general internal medicine at the Johns Hopkins University School of Medicine.
They found an inverse relationship between vitamin D and CRP in adults without cardiovascular symptoms but with relatively low vitamin D levels.
Healthier, lower levels of inflammation were found in people with normal or close to normal vitamin D levels.