Figure 3.

Effects of UV exposure on vitamin D₃ metabolite levels at each dietary supplementation level, regardless of sex. There was no significant dose by UV exposure interaction, but there was a significant effect of UV exposure on serum 25OHD₃ levels (A) (P<0.001; n=18 per UV exposure group including 3 male and 3 female mice at each dietary level). There was a dose by UV interaction for serum C3epi levels (B) (P=0.0287; n=6, including 3 male and female per UV/dose group). No significant effects of either UV exposure by dose or UV exposure alone were detected for skin 25OHD₃ (C) or C3epi (D) levels (n=6 per UV/dose group or n=18 per UV group).