Respondents who indicated that they had taken the second vitamin for different reasons than they had taken the first, were asked to supply a reason for taking that second vitamin. The reasons for using a second vitamin supplement that were recorded by the survey, and the associated IPUMS NHIS variables, are:

• VIT2DRUGCOST (Prescription or non-prescription drugs too expensive)

• VIT2HCREC (Health care provider recommended)

• VIT2IMMUN (Improved immune function)

• VIT2MEDCOST (Medical treatment too expensive)

• VIT2MEDFAIL (Medical treatment did not help)

• VIT2MENT (Improved mental ability or memory)

• VIT2PHYS (Improved physical performance)

• VIT2RELREC (Family or friends recommended)

• VIT2SEX (Improved sexual performance)

• VIT2WELL (General wellness)

• VIT2SPORT (Improved sports performance)

• VIT2TREAT (Treat a disease or health problem)

• VIT2PREV (Prevent a disease or health problem)

Parallel information was recorded on sample adults' reasons for taking their first vitamin supplement. (See, for example, VIT1DRUGCOST.)

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