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IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... currently lists 242,537 studies with locations in all 50 States and in 198 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 (38%)
color Both U.S. and non-U.S. (5%)
Total N = 42,143 studies
(Data as of April 23, 2017)