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At least 20 to 50 percent of adults have some form of low vitamin D values, a trait more common in winter months because of less sunlight but still more common in African-Americans because they convert less vitamin D from one form to another in the skin, according to the experts.

At least 20 to 50 percent of adults have some form of low vitamin D values, a trait more common in winter months because of less sunlight but still more common in African-Americans because they convert less vitamin D from one form to another in the skin, according to the experts.

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Vitamin D checks are vital for African-Americans

African-Americans are at a higher risk for vitamin D deficiency than anyone else in the U.S. population, according to some medical experts.