Who can join
Studies for younger adults
These studies accept adults from 21 or younger and set an upper age limit of 45 or below, so they are aimed at younger adults. Being in the age range does not mean you qualify; screening decides.
674 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteers
Patient-centered Information on Permanent Contraception
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 21–45 · Women only
- RecruitingHealthy volunteers
Predicting Responses to Exhausting, Prolonged, And Repeated Exercise Demands (PREPARED) for Heat
State University of New York at Buffalo
- Location
- Buffalo, NY
- Eligibility basics
- Ages 18–39
- RecruitingHealthy volunteers
Impact of Haskap Berries on Recovery From High Intensity Resistance Training
Montana State University
- Location
- Bozeman, MT
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Hemodynamics Monitoring During Lower Body Negative Pressure (LBNP) Induced Controlled Hypovolemia
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 20–45
- RecruitingHealthy volunteers
Mechanisms of Pregnancy Vascular Adaptations
University of Wisconsin, Madison
- Location
- Madison, WI
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
Characterization of the Nrf2 Response in Patients With Autosomal Dominant Polycystic Kidney Disease (ADPKD)
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Healthy Mom Zone Gestational Weight Gain Management Intervention 2.0
Penn State University
- Location
- University Park, PA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersPhase 4
Androgen Effects on the Reproductive Neuroendocrine Axis, 2025 Version
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteersPhase 2
Effectiveness Study of a Lifestyle Intervention Versus Metformin in Mothers With Recent Gestational Diabetes
George Washington University
- Location
- Washington D.C., DC
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Acute Alcohol Response In Bipolar Disorder: a Longitudinal Alcohol Administration/fMRI Study
University of Texas at Austin
- Location
- Austin, TX
- Eligibility basics
- Ages 21–26
- RecruitingHealthy volunteers
Menstrual Cycle TMS Plasticity Pilot
University of Pennsylvania
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 20–40
- RecruitingHealthy volunteers
Effects of Physical and Psychosocial Stress on Functional Hypothalamic Amenorrhea in Exercising Women
University of Colorado, Colorado Springs
- Location
- Colorado Springs, CO
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteersPhase 4
Insights in Endocervical Mucus Secretion
Oregon Health and Science University
- Location
- Portland, OR
- Eligibility basics
- Ages 21–40 · Women only
- RecruitingHealthy volunteers
Promoting Resilience in Early Survivorship Among Adolescents and Young Adults With Cancer
Dana-Farber Cancer Institute
- Location
- Boston, MA
- Eligibility basics
- Ages 12–25
- RecruitingHealthy volunteers
Bioavailability of Ration Items Containing Tart Cherry Extract
United States Army Research Institute of Environmental Medicine
- Location
- Natick, MA
- Eligibility basics
- Ages 17–39
- RecruitingHealthy volunteers
Muscle O2 Saturation and Hemoglobin Levels During Rehabilitation From Arthroscopic Surgery
University Hospitals Cleveland Medical Center
- Location
- Cleveland, OH
- Eligibility basics
- Ages 14–30
- RecruitingHealthy volunteers
Reading Outcomes in Children With Vestibular Loss
Father Flanagan's Boys' Home
- Location
- Omaha, NE
- Eligibility basics
- Ages 7–18
- RecruitingHealthy volunteers
BrainWeighve App Feasibility Study
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 14–21
- RecruitingHealthy volunteers
Effectiveness Testing of a Videogame Intervention (No Baby No) to Decrease Contraception Non-use Among Adolescents.
Weill Medical College of Cornell University
- Location
- Brooklyn, NY + 5 other US sites
- Eligibility basics
- Ages 15–20
- RecruitingHealthy volunteersPhase 4
MenB-FHbp or MenACWY-TT/MenB-FHbp Vaccine in MenB-4C Primed Young Adults
Emory University
- Location
- Atlanta, GA + 1 other US site
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteers
fMRI and IVCM Cornea Microscopy of CXL in Keratoconus
Boston Children's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 8–35
- RecruitingHealthy volunteers
Mitochondrial DNA Signatures of Poor Aerobic Exercise Trainability in Young Adults Born Preterm
Texas Tech University
- Location
- Lubbock, TX
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
The Role of Macrophage Activation in Lung Injury Following Ozone Exposure
Rutgers, The State University of New Jersey
- Location
- Piscataway, NJ
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteersPhase 2
A Study of Emapalumab for Pediatric Aplastic Anemia
Memorial Sloan Kettering Cancer Center
- Location
- New York, NY + 4 other US sites
- Eligibility basics
- Ages 0 mo–25
Questions
If I fit this group, will I qualify?
Not necessarily. Age and sex limits are only the first filter. Each study has its own inclusion and exclusion criteria, and the research team decides at screening.
Where do these age and sex limits come from?
From the eligibility section of each study’s official ClinicalTrials.gov record. We don’t infer eligibility from anything else.