Several levels. The fda regulates drugs for purity and efficacy. The fda regulates food for purity but not quality. The fda is forbidden by law to inspect in any way food supplements like vitamins and nutritional products unless there are serious complaints after they hit the market. Consumer reports will sometimes look at content. You cannot trust agencies paid for by the food industry.
FDA. The food and drug administration (fda) provides rules and regulations regarding labeling. Various corporations and agencies (food label consultants, product label review services, food label nutritional analysis, etc.) conduct evaluations and reviews that lead to information on the labels, and facilitate communication between companies and consumers.