Vitamin D for bad knees.
D000368:Aged; D006801:Humans; D020370:Osteoarthritis, Knee / Q000150:complications / Q000188:drug therapy*; D014807:Vitamin D / Q000008:administration & dosage*; D014808:Vitamin D Deficiency / Q000150:complications / Q000188:drug therapy*
D014807:Vitamin D