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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 12 of 297
- RecruitingHealthy volunteersPhase 1
A Safety and Immunogenicity Trial of OCU500, ChAd36 Vector Encoding SARS-CoV-2 Spike Vaccine Via Intranasal and Inhalational Routes in Previously Vaccinated Adults
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Decatur, GA + 4 other US sites
- Eligibility basics
- Ages 18–64
- RecruitingHealthy volunteersPhase 2Overnight stay mentioned
Neuroplasticity Enhancement From Cognitive Training Reinforced by Psilocybin
National Institute on Aging (NIA)
- Location
- Baltimore, MD
- Eligibility basics
- Ages 65–120
- RecruitingHealthy volunteersPhase 1
Phase 1 Study of CH505 HIV Vaccine Nanoparticles and mRNA Boosters in Healthy Adults
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Boston, MA + 1 other US site
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1
First-in-Human Evaluation of [11C]JMJ-129-d2 for PDE4D Imaging in Healthy Volunteers
National Institute of Mental Health (NIMH)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–105
- RecruitingHealthy volunteersOvernight stay mentioned
Natural History, Genetics, and Pathophysiology of Systemic Juvenile Idiopathic Arthritis, Adult-Onset Still's Disease, and Related Conditions
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 0 mo–100
- RecruitingHealthy volunteersPhase 1
Phase 1 Challenge Study Using rDEN2delta30-7169 to Evaluate Host-Pathogen Interactions in Primary, Homotypic, and Heterotypic Dengue Virus Infection
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteersPhase 1
Neuropharmacologic Imaging and Biomarker Assessments of Response to Acute and Repeated-Dosed Ketamine Infusions in Major Depressive Disorder
National Institute of Mental Health (NIMH)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1/Phase 2
SV2A in Older Adults
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteersOvernight stay mentioned
Eating to Adjust the Timing System
Brigham and Women's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteersPhase 1
The ENHANCE Study: taVNS and Psilocybin
University of Wisconsin, Madison
- Location
- Madison, WI
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteersEarly Phase 1
Contribution of UGT2B17 to the Pharmacokinetics of Diclofenac
Washington State University
- Location
- Spokane, WA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1
Imatinib to Increase RUNX1 Activity in Participants With Germline RUNX1 Deficiency
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–120
- RecruitingHealthy volunteersPhase 1
Quadrivalent Influenza HA Stem Vaccine VRC-FLUMOS0122-00-VP (SteMos1) With and Without ALFQ Adjuvant in Healthy Adults
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteersPhase 1
Impact of Early ADL Education on Outcomes Post DRF ORIF
George Washington University
- Location
- Washington, VA
- Eligibility basics
- Ages 18–110
- RecruitingHealthy volunteersPhase 1/Phase 2
Suvorexant for Alcohol Use Disorder (AUD): Neural Mechanisms
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteersPhase 1
Army-SPRING Army-Suicide Prevention Research
University of Pennsylvania
- Location
- Philadelphia, PA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteersOvernight stay mentioned
Clinical and Laboratory Study of Methylmalonic Acidemia
National Human Genome Research Institute (NHGRI)
- Location
- Bethesda, MD + 1 other US site
- Eligibility basics
- Ages 1 mo–115
- RecruitingHealthy volunteersOvernight stay mentioned
Natural History, Physiology, Microbiome and Biochemistry Studies of Propionic Acidemia
National Human Genome Research Institute (NHGRI)
- Location
- Bethesda, MD + 1 other US site
- Eligibility basics
- Ages 1 mo–100
- RecruitingHealthy volunteersPhase 1
Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of Fx-5A in Healthy Volunteers
National Heart, Lung, and Blood Institute (NHLBI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–99
- RecruitingHealthy volunteersPhase 1/Phase 2
Phase I/II Study to Reduce Post-transplantation Cyclophosphamide Dosing for Older or Unfit Patients Undergoing Bone Marrow Transplantation for Hematologic Malignancies
National Cancer Institute (NCI)
- Location
- Bethesda, MD + 1 other US site
- Eligibility basics
- Ages 12–85
- RecruitingHealthy volunteersPhase 1/Phase 2
Donor Lymphocyte Infusion After Allogeneic Hematopoietic Cell Transplantation for High-Risk Hematologic Malignancies
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 12–120
- RecruitingHealthy volunteersPhase 1/Phase 2
The Lowest Effective Dose of Post-Transplantation Cyclophosphamide in Combination With Sirolimus and Mycophenolate Mofetil as Graft-Versus-Host Disease Prophylaxis After Reduced Intensity Conditioning and Peripheral…
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 12–120
- RecruitingHealthy volunteersPhase 1/Phase 2
Trial of Allogeneic Reduced-Intensity, HLA-Haploidentical Allogeneic Hematopoietic Cell Bone Marrow Transplantation Followed by Graft-versus-Host-Disease (GVHD) Prophylaxis With Cyclophosphamide, Bortezomib and…
National Cancer Institute (NCI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 12–120
- RecruitingHealthy volunteersOvernight stay mentioned
Can Food Timing Reduce Your Diabetes Risk?
Brigham and Women's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–45
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