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Milk antirachitic activity (mean ± SEM) over time in lactating mothers receiving 2000 IU/d (n = 9) or 4000 IU/d (n = 9) of vitamin D. Whole-milk samples were evaluated for vitamin D antirachitic activity from measurements of vitamin D-2, vitamin D-3, 25-hydroxyvitamin D-2, and 25-hydroxyvitamin D-3 concentrations in the milk. The values were converted to antirachitic activity (IU/L) using reference from biological activity assays. Reproduced with permission from (18).
