US FDA Food Labeling Regulations (21 CFR Part 101) 101.9-ACC: Compliance and accuracy: Class I and Class II nutrient tolerances (at least 100 percent for added vitamins, at least 80 percent for naturally occurring beneficial nutrients, no more than 120 percent for calories, fats, sugars and sodium), composite sampling and record keeping for added sugars and fiber determinations (101.9(g))

A food is misbranded if the declared nutrient values fail the 101.9(g) compliance tests on a composite of 12 subsamples from 12 randomly chosen shipping cases: added vitamins, minerals, protein, dietary fiber and potassium (Class I) must be present at 100 percent of the declared value or more; naturally occurring vitamins, minerals, protein, fiber and potassium (Class II) at 80 percent or more; and calories, sugars, added sugars, total fat, saturated fat, trans fat, cholesterol and sodium at no more than 120 percent of the declared value, with reasonable excesses or deficiencies acceptable within good manufacturing practice. Manufacturers must make and keep written records to verify the declared amounts of added sugars, dietary fiber (for mixtures of soluble and insoluble fiber and non-digestible carbohydrates), vitamin E and folate where analytical methods cannot distinguish them, for at least two years after introduction of the food, and provide them to FDA on request.