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7,114 recruiting studies with US sites, from the official ClinicalTrials.gov registry (refreshed Oct 27, 2026). No sign-up needed.
Most recently updated studies · page 23 of 297
- RecruitingHealthy volunteersEarly Phase 1
Study of Biodistribution, Metabolism, Excretion and Brain Uptake11C-M503
University of Pennsylvania
- Location
- New Haven, CT + 2 other US sites
- Eligibility basics
- Ages 40–85
- RecruitingHealthy volunteersPhase 1/Phase 2
FACE Phase II (a Stage II Trial)
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 60–89
- RecruitingHealthy volunteersPhase 1/Phase 2
Clinical Trials of Multivalent Opioid Vaccine Components
New York State Psychiatric Institute
- Location
- Eatontown, NJ
- Eligibility basics
- Ages 18–59
- RecruitingHealthy volunteersPhase 1
Safety and Immunogenicity of Ad4-HIV Envelope Vaccine Vectors in Healthy Volunteers
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1/Phase 2
Neural Response to Inflammatory Challenge in Major Depressive Disorder
Laureate Institute for Brain Research, Inc.
- Location
- Tulsa, OK
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1
Microelectrode Recordings From the Vagus Nerve in Awake Humans
University of Minnesota
- Location
- Minneapolis, MN
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteersPhase 1/Phase 2
Rh-PDGF vs EMD for Treatment of Intra-bony Defects
Nova Southeastern University
- Location
- Davie, FL
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 1
Comparative Analysis of Biotinylated, Irradiated and 51-Chromium Radiolabeled Red Blood Cells for Analysis of Recovery and Survival After Autologous Transfusion
Jose Cancelas
- Location
- Cincinnati, OH
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersOvernight stay mentioned
Circadian Rhythms in Human Adipose
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersOvernight stay mentioned
Effect of Battlefield Acupuncture on Pain Control During Inpatient Treatment of Exertional Rhabdomyolysis
Tripler Army Medical Center
- Location
- TAMC, HI
- Eligibility basics
- Ages 18–99
- RecruitingHealthy volunteersPhase 1/Phase 2
Abemaciclib in Combination With Bicalutamide for Androgen Receptor-positive, HER2-negative Metastatic Breast Cancer
Icahn School of Medicine at Mount Sinai
- Location
- New York, NY + 2 other US sites
- Eligibility basics
- Ages 18–90
- RecruitingHealthy volunteersEarly Phase 1
A Study of Niacin Regulation
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersEarly Phase 1
Regional Lipolysis Insulin Regulation
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1
Effect of Cannabis on E-Cigarette Use Behavior
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 21+
- RecruitingHealthy volunteersPhase 1
E-CEL UVEC Treatment for Anal Fissures
Weill Medical College of Cornell University
- Location
- New York, NY
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
Stimulating After Recovery From Traumatic Brain Injury
University of Minnesota
- Location
- Minneapolis, MN
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
Neurobehavioral Mechanisms Linking Childhood Adversity to Increased Risk for Smoking
Duke University
- Location
- Durham, NC
- Eligibility basics
- Ages 18–21
- RecruitingHealthy volunteersEarly Phase 1
Remimazolam NeuroImaging
Keith M Vogt
- Location
- Pittsburgh, PA
- Eligibility basics
- Ages 18–59
- RecruitingHealthy volunteersPhase 1
MDMA-Assisted Therapy for Mental Healthcare Providers
Rachel Yehuda
- Location
- New York, NY
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersOvernight stay mentioned
Patients and Families Improving Safety in Hospitals by Actively Reporting Experiences
Boston Children's Hospital
- Location
- Boston, MA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteersEarly Phase 1
PET Imaging of MMP Activation in AAA: Clinical Component
Washington University School of Medicine
- Location
- St Louis, MO
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 1
[18F]F-DOPA Imaging in Patients With Autonomic Failure
Daniel Claassen
- Location
- Nashville, TN
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
Dietary and Topical Magnesium Replacement or Supplementation in Patients With Lymphoma
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersEarly Phase 1
SV2A Density Cannabis Use Disorder
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–75
Data source: daily sync of the ClinicalTrials.gov API. How we list studies