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. 2007 Dec 18;93(3):677–681. doi: 10.1210/jc.2007-2308

Figure 1.

Figure 1

Mean (± sem) serum 25(OH)D levels after oral administration of vitamin D2 and/or vitamin D3. Healthy adults recruited at the end of the winter received placebo (•; n = 14), 1000 IU vitamin D3 (D3, ▪; n = 20), 1000 IU vitamin D2 (D2, ▴; n = 16), or 500 IU vitamin D2 and 500 IU vitamin D3 [D2 and D3, ♦; n = 18) daily for 11 wk. The total 25(OH)D levels are demonstrated over time. *, P = 0.027 comparing 25(OH)D over time between vitamin D3 and placebo; **, P = 0.041 comparing 25(OH)D over time between 500 IU vitamin D3 plus 500 IU vitamin D2 and placebo; ***, P = 0.023 comparing 25(OH)D over time between vitamin D2 and placebo.