The positions of the Dietary Guidelines for Americans on supplement use are:
- Dietary supplements may be useful in providing one or more nutrients that may be consumed in less-than-recommended amounts through food/beverages alone.
- Nutritional needs can and should be met primarily through foods/beverages by following a healthy dietary pattern.
- Dietary supplements may be useful in providing one or more nutrients that are 'of concern' for specific population groups.
Therefore, options B, C, and F are correct. Option A is incorrect as the guidelines do not suggest that supplements should not be on the market entirely. Option D is incorrect as the guidelines acknowledge that some people may have difficulty meeting their nutritional needs through food alone. Option E is incorrect as it is not always possible to meet all nutritional needs through food and beverages alone, especially if someone has specific dietary restrictions or requirements.