Dogan E et al. - Oral depot cholecalciferol treatment causes a statistically significant decrease of serum iPTH level but does not cause a statistically significant change in Ca, P, ratio of Ca P, or urinary calcium creatinine rate in UBD predialysis CKD. This treatment can be used safely for the predialysis CKD patients, along with the cautious control of serum calcium and phosphor.