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Used 1st vitamin supplement for: Improved immune function

Codes and Frequencies

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VIT1IMMUN indicates whether sample adults had used a first vitamin supplement to improve immune system function. Only sample adults who had taken one or more vitamin supplements during the past 30 days (VITMOSUPNO) were asked their reasons for using vitamin supplements.

Related Variables 

Other reasons for using a first vitamin supplement that were recorded by the survey, and the associated IPUMS NHIS variables, are:

  • VIT1DRUGCOST (Prescription or non-prescription drugs too expensive)
  • VIT1HCREC (Health care provider recommended)
  • VIT1MENT (Improved mental ability or memory)
  • VIT1PHYS (Improved physical performance)
  • VIT1SEX (Improved sexual performance)
  • VIT1TREAT (Treat a disease or health problem)
  • VIT1PREV (Prevent a disease or health problem)

For sample adults who had taken two or more vitamin supplements in the past 30 days, parallel information was recorded on their reasons for taking the second vitamin supplement. (See, for example, VIT2IMMUN.)

For information about the full range of variables related to vitamins, see VITANY and VITMO.


VIT1IMMUN is only available for 2007.


  • 2007: Sample adults age 18+ who have taken one or more herbal supplements during the past 30 days.


  • 2007