"The present study found that relatively high intakes of vitamin D would be needed to achieve serum 25(OH)D concentrations of 50 or 75 nmol/L for participants with low sun exposure. However, these results are relatively consistent with 2 recent studies that addressed this question with dose-response intervention trials. Cashman et al. (45) found that total intakes of 408 and 924 IU/d would be needed to maintain median serum 25(OH)D concentrations of 50 and 75 nmol/L, respectively, during the winter in Ireland and Northern Ireland...
In a second supplementation study conducted in New York (46), Black and White adults were recruited in winter and supplementation levels were adjusted at 8-wk intervals to achieve a serum 25(OH)D concentration of 75 nmol/L. Blacks had a mean total intake of 3916 IU/d and Whites had 3040 IU/d to achieve this level in 90% of participants. In the present study, we estimated that participants of AA with low sun exposure would need from 2100 to 3100 IU/d and participants of EA would need from 1000 to 2550 IU/d to reach 75 nmol/L, depending on the season."
This feels so under-studied and so important: People with dark skin living in parts of the world with low sun exposure might be super vitamin D deficient.
FB: "In summary, we have found that participants with high skin reflectance and high sun exposure are at low risk of vitamin D insufficiency and need a supplemental intake of 1300 IU/d only in the winter, whereas participants with low skin reflectance and low sun exposure need supplemental intake from 2100 to 3100 IU/d year-round to maintain a target serum level of 75 nmol/L."
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