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Vitamin D Supplements Tied to Lower Blood Pressure in Blacks
Date:3/15/2013

By Steven Reinberg
HealthDay Reporter

FRIDAY, March 15 (HealthDay News) -- Black Americans who take vitamin D supplements may significantly lower their blood pressure, a new study suggests.

"Compared with other races, blacks in the United States are more likely to have vitamin D deficiency and more likely to have high blood pressure," said lead researcher Dr. John Forman, an assistant professor of medicine at the renal division of Brigham and Women's Hospital in Boston.

But among the black study participants, three months of supplemental vitamin D was associated with a drop in systolic blood pressure (the top number in a blood pressure reading) of up to 4 mm Hg, the researchers found.

"If our findings are confirmed by other studies, then vitamin D supplementation may be a useful means of helping black individuals lower their blood pressure," Forman said.

Dr. Michael Holick, a professor of medicine, physiology and biophysics at Boston University School of Medicine, said that vitamin D may lower blood pressure by causing blood vessels to relax, allowing for more and easier blood flow.

In addition, because many black Americans are deficient in vitamin D, taking a supplement may benefit their health even more, said Holick, who was not involved with the study.

"We are now beginning to believe that a lot of the health disparities between blacks and whites are due to vitamin D deficiency, including the risk for type 2 diabetes, heart disease, cancers and even infectious disease," he said.

Diet and sunlight are two natural sources of vitamin D in humans. However, having dark-colored skin cuts down on the amount of vitamin D the skin makes, according to the U.S. National Institutes of Health.

For the study, published online March 13 and in the April print issue of the journal Hypertension, Forman's team randomly assigned 250 black participants to one of three doses of vitamin D sup
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