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7,120 recruiting studies with US sites, from the official ClinicalTrials.gov registry (refreshed Oct 26, 2026). No sign-up needed.
Most recently updated studies · page 15 of 297
- RecruitingHealthy volunteersPhase 1
Inflammatory Challenge and Fear
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1
A Clinical Study to Investigate the Safety and Immunogenicity of rVSV∆G-SUDV-GP, a Sudan Virus (SUDV) Vaccine for the Prevention of SUDV Disease in Adults in Good General Health
International AIDS Vaccine Initiative
- Location
- Washington D.C., DC + 2 other US sites
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteersPhase 1
PET Imaging of Cyclooxygenases in Neurodegenerative Brain Disease
National Institute of Mental Health (NIMH)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–99
- RecruitingHealthy volunteersPhase 1
Clinical Trial to Evaluate the Safety and Immunogenicity of Hiltonol, Poly-ICLC-adjuvanted CD40.HIVRI.Env (VRIPRO) in Adult Participants Who Previously Participated in HVTN 706
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- San Francisco, CA + 3 other US sites
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteersPhase 1
Effects of Various Cannabis Strains on Perceptual, Subjective and Objective Use Outcomes
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 21–55
- RecruitingHealthy volunteersPhase 1
The Impact of Light Exposure on Cognitive Function in Classrooms
Michigan State University
- Location
- East Lansing, MI
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
Imaging Mitochondrial Complex-I in Alcohol Use Disorder
Rajesh Narendran
- Location
- Pittsburgh, PA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersOvernight stay mentioned
Effect of Physical Activity Pattern on Cardiometabolic Health
Brigham and Women's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteersPhase 1
Safety and Tolerability Trial of Psilocybin in Healthy Older Adults
University of Colorado, Denver
- Location
- San Francisco, CA + 5 other US sites
- Eligibility basics
- Ages 65–85
- RecruitingHealthy volunteersPhase 1/Phase 2
Assessing Pulmonary Changes in HSCT
Children's Hospital Medical Center, Cincinnati
- Location
- Cincinnati, OH
- Eligibility basics
- Ages 3+
- RecruitingHealthy volunteersPhase 1
Gamma Oscillations as a Prognostic Marker for Ketamine Therapy in Treatment Resistant Depression
Texas A&M University
- Location
- Houston, TX + 1 other US site
- Eligibility basics
- Ages 21–45
- RecruitingHealthy volunteersPhase 1
PRoMiSS: Psilocybin and the Role of Music in Set and Setting
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 21–75
- RecruitingHealthy volunteersPhase 1/Phase 2
Use of Hyperpolarized 129Xe MR Lung Imaging in Adults for Calibration
Children's Hospital Medical Center, Cincinnati
- Location
- Cincinnati, OH
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
Single-tracer Multiparametric PET Imaging
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 1
Iadademstat + SBRT With Atezo in ES-SCLC
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
Psilocybin Administration With 5-HT1a Blockade
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 21–60
- RecruitingHealthy volunteersEarly Phase 1
Imaging Mitochondrial Complex-I in Cocaine Use Disorder: a [F-18]BCPP-EF PET Study
Rajesh Narendran
- Location
- Pittsburgh, PA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteersPhase 1/Phase 2
Annatto-derived GG for Statin-associated Myopathy
Texas Tech University Health Sciences Center
- Location
- Lubbock, TX
- Eligibility basics
- Ages 40+
- RecruitingHealthy volunteersPhase 1
OMAR Opioid Use Disorder
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
Impact of Early Aging and Menopause on the Vascular Responses to Hypoxia
University of Missouri-Columbia
- Location
- Columbia, MO
- Eligibility basics
- Ages 18–70 · Women only
- RecruitingHealthy volunteersPhase 1/Phase 2
Study of Cannabidiol and Neuroimaging on Stress
Icahn School of Medicine at Mount Sinai
- Location
- New York, NY
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteersEarly Phase 1
Beta3-adrenergic Receptors and Cardiovascular Function in Aging Women
University of Missouri-Columbia
- Location
- Columbia, MO
- Eligibility basics
- Ages 18–70 · Women only
- RecruitingHealthy volunteersPhase 1
Testing RG1-VLP Vaccine to Prevent HPV-related Cancers
National Cancer Institute (NCI)
- Location
- Madison, WI
- Eligibility basics
- Ages 18–60 · Women only
- RecruitingHealthy volunteersPhase 1
Exploring the Utility of [18F]3F4AP for Demyelination Imaging
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–90
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