Oral or Intra Muscular Vitamin D2 Vs Oral or Intra Muscular Vitamin D3 in Treatment of Vitamin D Deficiency

"The first phase will involve studying 4 groups with the outcome (percentage of patients attaining Vitamin D levels \>30ng/ml) at 3 months to show the superiority of any of the groups. Vitamin D levels will be checked at baseline then 6 and 12 weeks. The second phase will include only patients who achieve the target level above 30ng/ml after the first phase and will be randomized to receive either oral Vitamin D2 or oral Vitamin D3 every 2, 3 or 4 weeks for another 3 months.~For patients that achieved normal level in phase 1, we will keep a maintenance dose of the oral Vitamin D for 2 groups with 3 sub-groups under each."