title: I've heard that some supplements contain vitamin D2 while others contain vitamin D3. Is one more effective?
mesh_terms: D002762:Cholecalciferol / Q000627:therapeutic use*; D004872:Ergocalciferols / Q000627:therapeutic use*; D005260:Female; D017408:Guidelines as Topic; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D010353:Patient Education as Topic; D014481:United States; D014808:Vitamin D Deficiency / Q000517:prevention & control; D014815:Vitamins / Q000008:administration & dosage; D016387:Women's Health
chemical_list: D004872:Ergocalciferols; D014815:Vitamins; D002762:Cholecalciferol