Figure 3.

Percentage of respondents reporting knowledge of government regulation of DS efficacy for all respondents and according to DS user status. Respondents prompted to answer ‘Yes’, ‘No’, or ‘Don’t know’ to the following question, “Does the U.S. Government require that all dietary supplements sold will work as promised?” P < 0.001 indicates a significant association between DS use status and knowledge of government regulation of DS efficacy according to the Wald chi-square test.

Carvey et al. BMC Complementary and Alternative Medicine 2012 12:182   doi:10.1186/1472-6882-12-182
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