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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 143 of 297
- RecruitingHealthy volunteers
The Mechanistic Biology of Primary Immunodeficiency Disorders
National Institute of Allergy and Infectious Diseases (NIAID)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 0 mo–90
- RecruitingHealthy volunteers
Human Visual and Vestibular Motion Perception Study
University of Rochester
- Location
- Rochester, NY
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Mechanisms Underlying Individual Variations of Taste and Smell in Obesity
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Natural History of the Human Biological Response to Environmental Exposure and Injury
National Institute of Environmental Health Sciences (NIEHS)
- Location
- Research Triangle Park, NC
- Eligibility basics
- Ages 18–90
- RecruitingHealthy volunteers
A Study to Measure the Effect of Brain Stimulation on Hand Strength and Function in Patients With Brain Tumors
Medical College of Wisconsin
- Location
- Milwaukee, WI
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteers
Neutrophil Extracellular Traps Formation in Breast Cancer Patients Taking Tamoxifen
M.D. Anderson Cancer Center
- Location
- Houston, TX
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Whole Genome Sequencing (ChromoSeq) as an Adjunct to Conventional Genomic Profiling in MDS
Washington University School of Medicine
- Location
- St Louis, MO
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The Impact of Menthol Flavoring on Switching in Adult Menthol Smokers
Nikki Nollen, PhD, MA
- Location
- Kansas City, MO
- Eligibility basics
- Ages 21+
- RecruitingHealthy volunteers
Individual Variations of Taste and Smell Perception in Alcohol Use Disorder (AUD)
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Nutrition for Precision Health, Powered by the All of Us
RTI International
- Location
- Birmingham, AL + 12 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 3
Switching to E-cigarettes in Smokers Not Interested in Quitting
University of Kansas Medical Center
- Location
- Kansas City, MO + 1 other US site
- Eligibility basics
- Ages 21+
- RecruitingHealthy volunteers
OCT Vibrography for Biomechanical Properties of Tissues
Massachusetts General Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteersPhase 2
EMBRACE: Exercising Together
OHSU Knight Cancer Institute
- Location
- Portland, OR
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Gut Oxalate Absorption in Calcium Oxalate Stone Disease
University of Alabama at Birmingham
- Location
- Birmingham, AL + 1 other US site
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Rigorous Evaluation of the READY to Stand Curriculum to Prevent the Commercial Sexual Exploitation of Children
University of Michigan
- Location
- Des Moines, IA
- Eligibility basics
- Ages 13–19
- RecruitingHealthy volunteersPhase 4
Anterior Femoral and Adductor Canal Nerve Blocks in Peds Knees
Hospital for Special Surgery, New York
- Location
- New York, NY
- Eligibility basics
- Ages 8–18
- RecruitingHealthy volunteersPhase 2
Intravesical Bupivacaine on Post-Operative Ureteroscopy Pain
University of Chicago
- Location
- Chicago, IL
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Developing and Testing a Trauma-Informed Exercise Intervention for Women Veterans With Histories of Sexual Violence
VA Office of Research and Development
- Location
- Boston, MA + 1 other US site
- Eligibility basics
- Ages 21–65 · Women only
- RecruitingHealthy volunteers
Research on Equity in Abortion Care by TeleHealth
University of California, San Francisco
- Location
- Oakland, CA
- Eligibility basics
- Ages 14–64
- RecruitingHealthy volunteers
Couples' Affect in Relationships Study
University of Wisconsin, Madison
- Location
- Madison, WI
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Vapocoolant Spray to Reduce Pain With Nexplanon Insertion
Queen's Medical Center
- Location
- Honolulu, HI + 1 other US site
- Eligibility basics
- Ages 14+ · Women only
- RecruitingHealthy volunteersPhase 4
Central Apnea in Heart Failure: Physiological Mechanisms to Inform Treatment
VA Office of Research and Development
- Location
- Detroit, MI
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
K08 VR Fear Conditioning
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteersPhase 3
Exploring Sympathetic Nervous System Function in Individuals With Down Syndrome
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 18–50
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