A self-administered, one-year supplement frequency questionnaire (SFQ) was completed at baseline and one year later, and compared for differences in responses. The SFQ asked about different types of multiple vitamin and mineral (MVM) preparations, 11 common single-nutrient supplements, as well as ...
Participants also completed three self-reported measures of dietary supplement use: a one-month diary, a recall of the past month, and a short frequency questionnaire covering the past year (SFQ). For 402 participants who completed the study, we calculated nutrient intakes from all supplements ...
Here we compare data from a detailed, full year inventory of supplement use to estimates from a self-administered supplement frequency questionnaire (SFQ) that asked about multivitamin use, 11 single-nutrient supplements, as well as fish oil and garlic. Categorical dose range was asked for ...