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Ever used high dose or megavitamin therapy

Codes and Frequencies

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For sample adults in 2002 who had ever used vitamins for their own health or treatment (VITEV), VITMEGAEV indicates whether the person had ever used high dose or megavitamin therapy.


The 2002 Field Representative's Manual defines "high dose or megavitamin therapy" as:

the use of vitamins in excess of the Recommended Daily Allowances (RDA) established by the National Academy of Sciences, Food and Nutrition Board. While these therapies have been used for the prevention and treatment of diseases and illnesses such as cancer, heart disease, schizophrenia, and the common cold, some high dose or megavitamin regimens can produce adverse or toxic effects.

This definition was not routinely shared with respondents.

Related Variables 

Sample adults with an affirmative response to VITEV could also report that they had ever used:

  • Multi-vitamins such as One-A-Day (VITMULTEV)
  • Individual vitamin supplements (VITSUPEV)

However, only those who had used megavitamin therapy (i.e., with a "Yes" response in VITMEGAEV) were asked further questions about their use of vitamins in 2002.

Respondents who had ever used high dose or megavitamin therapy were asked follow-up questions including: whether they had used such therapy in the past 12 months; which vitamins were taken in high dose; whether megavitamin therapy was used to treat a specific health problem or condition and which condition(s) such therapy was used to treat; other reasons for using megavitamin therapy; the importance of megavitamin therapy to their well-being; whether they were seeing a practitioner for megavitamin therapy; and whether they had told a conventional health care practitioner about their use of megavitamin therapy.

For more information on the aforementioned variables related to high dose or megavitamin therapy, see VITYR.


VITMEGAEV is only available for 2002.


  • 2002: Sample adults age 18+ who have ever used vitamins for their health or treatment.


  • 2002