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IMPORTANT: Information on is provided by the sponsor or principal investigator of the clinical study, and posting to this site does not necessarily reflect endorsement by NIH. does not independently verify the scientific validity or relevance of the submitted information beyond a limited quality control review for apparent errors, deficiencies, or inconsistencies. Talk with a trusted healthcare professional before choosing to participate in a clinical study. currently lists 239,638 studies with locations in all 50 States and in 197 countries.

Locations of Recruiting Studies

Recruiting Study Location Count Pie Chart
Legend for Recruiting Study location pie chart image
Pie Color Location
color Non-U.S. only (56%)
color U.S. only (39%)
color Both U.S. and non-U.S. (5%)
Total N = 41,502 studies
(Data as of March 22, 2017)