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Vitamin D insufficiency is a prevalent problem among adolescents. Researchers in the Boston area found that of 307 otherwise healthy adolescents, 42% had insufficient vitamin D status, and 24% were deficient (25OHD level less than 20 ng/ml). African American teenagers had the highest incidence of vitamin D deficiency (36%). Three additional studies and surveys in other areas have also documented that vitamin D insufficiency is a common problem among adolescents, particularly for residents in the northern regions of the United States.

Gordon CM and others. "Prevalence of vitamin D deficiency among healthy adolescents." Arch Pediat Adolesc Med., 2004;158:531-537.

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