MHS Canto-Costa, I Kunii and OM Hauache (2006). Body fat and cholecalciferol supplementation in elderly homebound individuals. Brazilian Journal of Medical and Biological Research, 39: 91-98.  

Figure 1. Effect of cholecalciferol on plasma 25(OH)D (ng/mL) at the beginning of the study and after 12 weeks. The subjects received 7000 IU/week of cholecalciferol. 25(OH)D = 25-hydroxyvitamin D.