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Little is known about the vitamin D3 epimer [3-epi-25(OH)D3], particularly in adults. We describe characteristics of the D3 epimer within the community-based ARIC cohort.The vitamin D3 epimer, 25(OH)D3, and 25(OH)D2 were measured using LC-MS/MS in stored serum collected in 1990–1992 from 9,887 white and 3,221 black ARIC study participants, aged 46–70years. Cross-sectional characteristics were explored...
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