Editorial Policy

NIH health information is based on research results published in peer-reviewed, scientific literature.

Materials are updated regularly to reflect new findings and ensure accuracy.

All of our research institutes create materials based on the scientific literature and their expertise in specific areas of science and health.

NIH health information, unless specifically noted, is free to be used and duplicated.

NIH welcomes questions or comments about health information at NIHinfo@od.nih.gov