All the 40 subjects will be randomized in 1:1 ratio (Active: placebo) into treatment group and placebo group in 2:1 ratio in a double blind manner. Random code would be generated by a investigator, who will not be involved in distribution of medicines and assessment of the muscle strength Active drug would be calcium (two tablets of calcium carbonate each containing 500 mg of elemental calcium/day, and 60,000 IU of cholecalciferol/week obtained from the commercial source. The inactive drug would be lactose containing identical placebo obtained from the same source. All study subjects will be provided with packets containing four sachets of cholecalciferol (each containing 60000 IU vitamin D3; Cadila Pharmaceutical, India) /placebo; and sixty tablets of calcium carbonate (500mg elemental calcium & 250 IU vitamin D3; Elder Pharmaceutical, India)/placebo. First dose will be supervised. Subjects will be counseled for daily intake of two tablets of calcium carbonate and weekly intake of a cholecalciferol sachet and follow up at completion of 4 weeks. Similar packets will be given after 4 weeks of follow up. Drug compliance will be assessed by counting the empty sachets. After eight week subjects will be provided daily two tablets of calcium carbonate containing 500 mg elemental calcium each and 250IU of Vitamin D3.