title: On call.  After reading your article on multivitamins, I've decided to switch from my old multivitamin to plain vitamin D.  But I'm confused by various types of vitamin D.  Which kind should I take?
authors.forename: Harvey B
authors.initials: HB
authors.lastname: Simon
mesh_terms: D002762:Cholecalciferol / Q000008:administration & dosage*; D002908:Chronic Disease / Q000517:prevention & control; D019587:Dietary Supplements; D004305:Dose-Response Relationship, Drug; D004872:Ergocalciferols / Q000008:administration & dosage*; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D014808:Vitamin D Deficiency / Q000517:prevention & control; D014815:Vitamins / Q000008:administration & dosage
chemical_list: D004872:Ergocalciferols; D014815:Vitamins; D002762:Cholecalciferol