Food and Drug Administration (FDA) is an agency in the United States Department of Health and Human Services. It seeks to protect the public health by ensuring the purity and security of foods; the safety and effectiveness of drugs, medical devices, biological products, and radiation-emitting products; and the safety of cosmetics. The FDA oversees the review and approval of new medicines and medical devices. It also monitors the safety of dietary supplements, though it does not review and approve the supplements before they are sold.