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Testimonial

The Marketing Scales website is a gold mine of information.  It is the only source that helps me understand the psychometric quality of the instruments used in past research.  I recommend that researchers bookmark this site . . . they will be back!
Bob Moritz
Marshfield Clinic Research Foundation

Knowledge of Vitamins (Subjective)

A person's opinion of his/her level of knowledge about vitamins and experience with taking them is measured in this scale with three, seven-point Likert-type items.