PubMed · 2010 · 16 citations · 28 references
25OHD insufficiency is common among low SES elderly African American women, and springtime sunlight exposure does not cause significant increases in 25OHD. Additionally, this population has low calcium and vitamin D intake from diet, and more women than expected had reduced BMD.
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Calcium plus Vitamin D Supplementation and the Risk of Fractures
Rebecca D. Jackson, Andrea Z. LaCroix, Margery Gass et al. · New England Journal of Medicine · 2006 · 1.9K citations · Full text