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
Improving Maternal Sleep and Mental Health
University of Colorado, Colorado Springs
- Location
- Colorado Springs, CO
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersPhase 4
Effects of Caffeine on Reinforcement Learning in Healthy Adults Using PET/MRI
Hsiao-Ying Wey
- Location
- Charlestown, MA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
The Role of the Time of Day in the Effects of Exercise on Memory in Heathy Young Adults
University of North Carolina, Greensboro
- Location
- Greensboro, NC
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteers
CYP2C19 Variants and Limonene Metabolism
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Young Adult Education on Alcohol & Health
University of Washington
- Location
- Seattle, WA
- Eligibility basics
- Ages 18–24 · Women only
- RecruitingHealthy volunteers
Effect of Resveratrol Supplementation on Exercise Performance and Recovery
University of Central Florida
- Location
- Orlando, FL
- Eligibility basics
- Ages 18–40 · Men only
- RecruitingHealthy volunteers
Non-invasive Brain Stimulation for Treating Symptomatic Convergence Insufficiency
Midwestern University
- Location
- Downers Grove, IL
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
The Effects of an Acute Dose of a Betalain-rich Concentrate on Repeated-sprint Cycling Performance and Recovery.
Drexel University
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Student Exercise and Sleep Timing Study - Part 2
Rutgers, The State University of New Jersey
- Location
- New Brunswick, NJ + 5 other US sites
- Eligibility basics
- Ages 18–23
- RecruitingHealthy volunteers
Internet Assisted Career-Oriented Soft-skills Training for Transition Age Youth with Mental Health Conditions
Rutgers, The State University of New Jersey
- Location
- Newark, NJ
- Eligibility basics
- Ages 16–24
- RecruitingHealthy volunteers
Standardized Yoga & Meditation Program for Stress Reduction for Adolescents With Irritable Bowel Syndrome
The Cooper Health System
- Location
- Camden, NJ
- Eligibility basics
- Ages 12–21
- RecruitingHealthy volunteers
Blood Flow Restriction Training on Upper Extremity Grip Strength
Casa Colina Hospital and Centers for Healthcare
- Location
- Pomona, CA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Influence of Fast and Slow Imagined Muscle Contractions on Muscle Function or Central Nervous System Properties
Kennesaw State University
- Location
- Kennesaw, GA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteersPhase 2
Effects of THC on Alcohol Consumption and Neural Correlates of Reward
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 21–40
- RecruitingHealthy volunteersPhase 4
Cardiometabolic Consequences of the Loss of Ovarian Function
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 20–45 · Women only
- RecruitingHealthy volunteers
Effectiveness of Dual Light Electric Toothbrush vs. Manual Toothbrush in Orthodontic Patients Undergoing Oral Surgery
Children's Hospital Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 6–20
- RecruitingHealthy volunteers
Acoustic Stimulation During Restricted Sleep After Sleep Deprivation
Walter Reed Army Institute of Research (WRAIR)
- Location
- Silver Spring, MD
- Eligibility basics
- Ages 18–39
- RecruitingHealthy volunteers
Sleep and Metabolism
Oregon Health and Science University
- Location
- Portland, OR
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Return to Play After ACL Reconstruction With Bone Marrow Aspirate, DBM, and an Internal Brace
Marshall University
- Location
- Huntington, WV
- Eligibility basics
- Ages 14–26
- RecruitingHealthy volunteers
A Prospective Study of a Mosaic Embryo Transfer
Colorado Center for Reproductive Medicine
- Location
- Lone Tree, CO
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Use of Continuous Glucose Monitors in Children and Adolescents With Obesity
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 10–21
- RecruitingHealthy volunteers
Adherence to Different Exercise Interventions
California Polytechnic State University-San Luis Obispo
- Location
- San Luis Obispo, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Keeping it LITE: Exploring HIV Risk in Vulnerable Youth With Limited Interaction and Digital Health Intervention
Hektoen Institute for Medical Research
- Location
- Chicago, IL
- Eligibility basics
- Ages 13–34
- RecruitingHealthy volunteers
BFRT in Adolescents After ACL Reconstruction
Children's Healthcare of Atlanta
- Location
- Atlanta, GA
- Eligibility basics
- Ages 12–18
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.