What is a primary difference between a food label and a supplement label?

The correct answer highlights a key distinction in how supplement labels are regulated compared to food labels. Supplement labels are required to list ingredients, but they do not have to specify the exact amounts of each ingredient present. Instead, they can indicate that an ingredient is present without detailing the precise dose or concentration. This flexibility allows supplement manufacturers to include proprietary blends or mixtures without disclosing the full breakdown of each component.

In contrast, food labels must adhere to stricter regulations concerning serving sizes, nutritional content, and ingredient disclosure. For instance, food labels provide specific serving sizes and must display the amounts of various nutrients, allowing consumers to make informed choices about their intake. Therefore, the difference underlines the variance in regulatory requirements and consumer information expectations between foods and dietary supplements.