National Institutes of Health

The National Institutes of Health (NIH) is the United States government’s primary agency for conducting and supporting biomedical and public health research. It pursues a mission to seek fundamental knowledge about living systems and to apply that understanding to enhance health, lengthen life, and reduce illness and disability. To fulfill this mission, NIH funds a vast array of research projects performed by scientists in universities, medical schools, and other research institutions across the country and around the world, while also carrying out intramural research in its own laboratories and clinical centers. The agency provides training and career development opportunities for emerging scientists, disseminates scientific information to health professionals and the public, and collaborates with international partners to address global health challenges. Its work spans basic discovery, translational studies, and clinical trials, covering areas such as cancer, infectious diseases, neuroscience, genetics, and environmental health.

NIH operates as a collection of 27 distinct institutes and centers, each focused on specific health topics or research methodologies, and employs more than 20,000 federal staff members, including scientists, administrators, and support personnel. The agency’s annual budget, appropriated by Congress, regularly exceeds $40 billion, making it one of the largest sources of biomedical research funding worldwide. A distinguishing attribute of NIH is its dual role as both a major funder of extramural research and a performer of high‑impact intramural science, which enables it to set research priorities, develop cutting‑edge technologies, and translate discoveries into practical health interventions. Structurally, NIH is an operating division of the United States Department of Health and Human Services, reporting to the Secretary of HHS and ultimately accountable to the President and Congress. This placement within the federal government underscores its responsibility to serve national health interests while maintaining scientific independence and adherence to rigorous ethical standards.