The FDA and CFR21 are two crucial regulatory bodies in the United States that ensure the safety and effectiveness of various products. As a federal agency within the Department of Health and Human Services, the FDA is responsible for safeguarding public health by regulating the manufacturing, marketing, and distribution of human and veterinary drugs, medical devices, food supply, cosmetics, and tobacco products. CFR21, on the other hand, contains the rules and regulations issued by federal agencies, including the FDA, that pertain to food and drugs. Title 21 covers a wide range of topics, including good manufacturing practices, labeling requirements, product safety standards, and more. These regulations are integral to maintaining the quality and safety of pharmaceuticals, medical devices, cosmetics, and other products.