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Vitamin D Is Essential To Bone And Heart Health, But Too Much Is Harmful

January 4, 2012: 12:00 AM EST
U.S. researchers have found that too much vitamin D – which is necessary for healthy bones and heart protection – may adversely affect cardiovascular health and could actually cause harm. Increasing levels of vitamin D in the blood are linked with lower levels of a marker for cardiovascular inflammation: c-reactive protein, or CRP. But increases in vitamin D beyond normal levels were associated with increases for the inflammation marker, which is linked to stiffening of the blood vessels and an increased risk of cardiovascular problems. “At some point,” the researchers concluded, “[vitamin D] can be too much of a good thing.” The findings were based on an analysis of data from more than 15,000 nutrition and health survey participants.
Muhammad Amer, M.D. et al., "Relation Between Serum 25-Hydroxyvitamin D and C-Reactive Protein in Asymptomatic Adults ", American Journal of Cardiology, January 04, 2012, © Elsevier Inc.
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