Figure 1
Time course of plasma calcidiol and calcium concentrations, as well as semi-quantitative measurements of plasma vitamin D 3 (cholecalciferol), after a single oral dose of 2,000,000 IU of vitamin D to two nursing home residents. The asterisk indicates the individual calcium measurements that show a biologically significant difference from baseline concentrations. Note the time-scale differences between the vitamin D3 (cholecalciferol) and the upper plots.