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 volunteersPhase 2
BCAAs in Concussion 3.0
Akiva Cohen
- Location
- Havertown, PA
- Eligibility basics
- Ages 11–23
- RecruitingHealthy volunteers
Prenatal Exercise and Glucose Regulation
University of Central Arkansas
- Location
- Conway, AR
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteers
Sex Differences in E-Cigarette Perception
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 21–44
- RecruitingHealthy volunteers
Addressing Root Causes for Gun Violence Prevention (ARC-GVP)
University of Michigan
- Location
- Ann Arbor, MI
- Eligibility basics
- Ages 14–24
- RecruitingHealthy volunteers
Causal Role of the Aperiodic Signal for Working Memory
Florida State University
- Location
- Tallahassee, FL
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteersPhase 4
HPV Vaccine Reduced Dose
Emory University
- Location
- Decatur, GA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Shoulder Strength in Baseball Players
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 15–22
- RecruitingHealthy volunteers
Transforming Maternal Mental Health Care
University of Utah
- Location
- Salt Lake City, UT
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Geospatial Analysis of Neighborhood Environmental Stress in Relation to Biological Markers of Cardiovascular Health and Health Behaviors in Women
National Heart, Lung, and Blood Institute (NHLBI)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 19–45 · Women only
- RecruitingHealthy volunteers
Retraining and Control Therapy (ReACT): Sense of Control and Symptom Expectations as Targets of a Treatment for PNES
University of Alabama at Birmingham
- Location
- Birmingham, AL
- Eligibility basics
- Ages 11–18
- RecruitingHealthy volunteers
Carcinogen and Toxicant Exposure Among Young Adults Who Co-Use Cigarettes, E-cigarettes and Cannabis (Co-Tox Study)
Roswell Park Cancer Institute
- Location
- Buffalo, NY
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteers
Near-Infrared Spectroscopy, Acute Taurine Supplementation, and Isolated Muscular Endurance and Fatigue Resistance in Young Healthy Adults
Louisiana State University and A&M College
- Location
- Baton Rouge, LA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Partnering to Enhance Emerging Adults' Response to Programs
UConn Health
- Location
- Dallas, TX
- Eligibility basics
- Ages 18–24
- RecruitingHealthy volunteers
Hormonal Responses to a Mixed Meal in People With Cystic Fibrosis
University of Cincinnati
- Location
- Cincinnati, OH
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Pharmacokinetics, Pharmacodynamics, and Safety Profile of Understudied Drugs Administered to Children Per Standard of Care (POPS)
Duke University
- Location
- Palo Alto, CA + 3 other US sites
- Eligibility basics
- Ages 0 mo–20
- RecruitingHealthy volunteers
Mitigating the Disinhibiting Effects of Alcohol With Transcranial Magnetic Stimulation
Michael J. Wesley, PhD
- Location
- Lexington, KY
- Eligibility basics
- Ages 21–29
- RecruitingHealthy volunteers
High Resolution Pharyngeal Manometry (HRPM) Biofeedback
NYU Langone Health
- Location
- New York, NY
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
PCOS and Brain Health
University of Wisconsin, Madison
- Location
- Madison, WI
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Ketone Ester and Salt (KEAS) in Young Adults
Indiana University
- Location
- Bloomington, IN
- Eligibility basics
- Ages 19–39
- RecruitingHealthy volunteers
ACEs, SIRT1, and Premature Vascular Aging in Humans
University of Wisconsin, Madison
- Location
- Madison, WI
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteersPhase 4
Evaluation of Fecal Microbiome Changes After Antegrade Continence Enema Placement and Initiation of Bowel Flush Regimen
Indiana University
- Location
- Carmel, IN + 1 other US site
- Eligibility basics
- Ages 2–18
- RecruitingHealthy volunteersPhase 4
Adaptions and Resiliency to Multi-Stressor OpeRations
Bradley Nindl
- Location
- Pittsburgh, PA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Speech Motor Learning and Retention (Master Protocol)
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Adaptive Self-Efficacy-Based AI Coaching for Cycling
University of Miami
- Location
- Coral Gables, FL
- Eligibility basics
- Ages 18–40
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.