Epidemiologic study of the C-3 epimer of 25-hydroxyvitamin D3 in a population-based sample

We report findings from an epidemiologic study of 3-epi-25(OH)D3 and show that individuals with lower total 25(OH)D3 tend to have a lower percent of 3-epi-25(OH)D3 relative to the total. While this is the largest reported sample of adults with measured 3-epi-25(OH)D3, the sample size of 303 is relatively small and replication of our findings is necessary.