This information is compiled, which provides regularly updated information about federally and privately supported clinical research in human volunteers. currently contains approximately 31,700 clinical studies sponsored by the National Institutes of Health, other federal agencies, and private industry. Studies listed in the database are conducted in all 50 states and in over 130 countries. Select a clinical area below, and watch for new topics to be added in the future. Please note that all clinical trials related to the neurosciences are available at