Overview The Effect of Inactive and Active Vitamin D on Serum Sclerostin/dickkopf1 Levels Status: Unknown status Trial end date: 2013-03-01 Target enrollment: Participant gender: Summary The purpose of this study is to compare the effect of inactive and active vitamin D on serum sclerostin and dickkopf1 levels. Phase: Phase 4 Details Lead Sponsor: Seoul National University HospitalTreatments: AlfacalcidolCalcitriolCholecalciferolErgocalciferolsHydroxycholecalciferolsVitamin DVitamins