Study methods include outpatient visits on days 1, 5, 10, 15, and an in-patient visit on day 21 for lab collection and patient examination. Blood and urine safety labs consist of serum ionized calcium, total calcium, creatinine, phosphorus and albumin. Efficacy labs consist of urine and blood measurements of 25-hydroxy vitamin D, 1,25 vitamin D, PTH, osteocalcin, bone specific alkaline phosphatase, procollagen peptide-1, C-telopeptide (CTx), N-telopeptide (NTx), Insulin-like growth factors (IgF) and serum free deoxypyridinoline (DPD).