title: I had gastic bypass surgery for weight loss, and I take a multivitamin to prevent nutrient deficiency.  How do I know if the multivitamin is doing an adequate job?
mesh_terms: D001361:Avitaminosis / Q000517:prevention & control*; D019587:Dietary Supplements; D015390:Gastric Bypass; D006801:Humans; D044342:Malnutrition / Q000517:prevention & control*; D014815:Vitamins / Q000627:therapeutic use*
chemical_list: D014815:Vitamins