 All subjects will cease any previous over the counter Vitamin D supplements at study start. Thereafter subjects will be block randomized to either Vitamin D3 25 000 IU monthly, 50 000 IU monthly or 50 000 IU fortnightly of oral Cholecalciferol Vitamin D3. Serum 25OHD, calcium, phosphate, iPTH and serum albumin will be measured again at 8, 16 and 24 weeks. At 24 weeks, 24 hour urine calcium will be measured again. 