Which of the following is CORRECT about supplements?
A. The USP stamp on a supplement doesn't really mean anything, it's just a gimmick.
B. Protein Powder, multivitamins, granola bars, and beverages are all classified as supplements.
C. The USP stamp on a supplement means that it has been checked for potency and ingredients.
D. Supplements are tested for potency and regulated prior to sale.