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Clinical Trials in the United States
Studies with U.S. locations that are recruiting, about to recruit or enrolling by invitation, from ClinicalTrials.gov
Study listings come from ClinicalTrials.gov, where sponsors register and update their own studies. A listing does not mean a study is safe or effective, and DatenUS does not recommend any study. Talk with your doctor before joining a clinical trial, and use ClinicalTrials.gov for contact details and full eligibility rules.
- Open studies
- 27,271
- With at least one U.S. site
- Most studies
- California
- 6,565 studies
Open studies by state
Studies with at least one site in each state. Darker states have more.
Frequently asked questions
- How many clinical trials are recruiting in the U.S.?
- 27,271 studies registered on ClinicalTrials.gov have at least one U.S. location and are recruiting, not yet recruiting or enrolling by invitation. California (6,565), Texas (5,569), New York (5,089) have the most.
- What does recruiting mean?
- Recruiting means the study is currently enrolling participants. Not yet recruiting means it has been registered but has not started enrolling. Enrolling by invitation means participants are selected by the study team rather than through open enrollment.
- How do I join a clinical trial?
- Read the full eligibility criteria and contact information on ClinicalTrials.gov, then talk with your doctor about whether a study may be right for you. The study team decides who can enroll.
Cancer
Heart, blood and metabolism
Brain and nerves
Mental health and substance use
Lungs and infections
Other conditions
Source: ClinicalTrials.gov, National Library of Medicine · Last updated 10/27/2026