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
Mobile Sun Health Intervention EnabLing Daily Protection
University of Utah
- Location
- Salt Lake City, UT
- Eligibility basics
- Ages 18–29
- RecruitingHealthy volunteers
Greek Connections Study
University of Washington
- Location
- Seattle, WA
- Eligibility basics
- Ages 18–29
- RecruitingHealthy volunteers
Examining the Impact of Exercise Training on Vascular Dysfunction in Individuals With Mental Health Disorders - Study 1
Virginia Commonwealth University
- Location
- Richmond, VA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
UCLA REST Study (REsearch on Sleep Techniques)
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–22
- RecruitingHealthy volunteers
Behavioral Economic Intervention to Improve HIV Behaviors in Sexual Minority Individuals
The University of Texas Health Science Center at San Antonio
- Location
- San Antonio, TX
- Eligibility basics
- Ages 18–34
- RecruitingHealthy volunteers
Developing Biomarker-Supported Schizophrenia Spectrum Disorder (SSD) Prevention
The University of Texas Health Science Center, Houston
- Location
- Houston, TX
- Eligibility basics
- Ages 9–19
- RecruitingHealthy volunteers
The Impact of Osteopathic Manipulative Treatment on Pelvic Floor Dysfunction, Activity, and Gait in Female Runners
Elizabeth Perrero
- Location
- Lexington, KY
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteers
State Representation in Early Psychosis 2
University of Minnesota
- Location
- Minneapolis, MN + 1 other US site
- Eligibility basics
- Ages 15–45
- RecruitingHealthy volunteers
A Seek, Test, and Treat Intervention to Reduce Chlamydia Trachomatis Disparities
Tulane University
- Location
- New Orleans, LA
- Eligibility basics
- Ages 15–26
- RecruitingHealthy volunteers
Adapting a Sexual Assault Prevention Intervention for Transgender Undergraduates: A One-Arm Pilot Trial
Sarah Peitzmeier
- Location
- College Park, MD
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteersPhase 4
Modafinil to Optimize the Performance of Cold-Stressed Sleep-Deprived Personnel
United States Army Research Institute of Environmental Medicine
- Location
- Natick, MA
- Eligibility basics
- Ages 17–39
- RecruitingHealthy volunteersPhase 4
Sleep Loss and Circadian Misalignment - Mechanisms of Insulin Resistance
Washington State University
- Location
- Spokane, WA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Youth-Onset Type 2 Diabetes and Heart Disease: The Young at Heart Prospective Cohort Study
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- Location
- Washington D.C., DC + 1 other US site
- Eligibility basics
- Ages 12–25
- RecruitingHealthy volunteers
Randomized Trial on Mobile Technology and Young Drivers' Cellphone Use
Motao Zhu
- Location
- Columbus, OH
- Eligibility basics
- Ages 18–24
- RecruitingHealthy volunteers
Efficacy of a Multi-level School Intervention for LGBTQ Youth
Washington University School of Medicine
- Location
- St Louis, MO
- Eligibility basics
- Ages 12–20
- RecruitingHealthy volunteers
Physical Activity to Mitigate PreEclampsia Risk
East Carolina University
- Location
- Greenville, NC
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
MAMA Tot - Healthy Weight Parallel Study
East Carolina University
- Location
- Greenville, NC
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
The Efficacy of Vitamin D Supplementation to Sustain Performance Outcomes
Walter Reed Army Institute of Research (WRAIR)
- Location
- Silver Spring, MD
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
THE GUIDE: Transforming Health for Young Adults Using Interventions to Drive Engagement
Boston Children's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–29
- RecruitingHealthy volunteers
Timing and Facilitation Effects of Theta-Burst Stimulation in the Reading and Language Networks
Georgia State University
- Location
- Atlanta, GA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
How a Single Workout Affects Gut Bugs in Women With Different Fitness Levels and Body Types
George Washington University
- Location
- Washington D.C., DC
- Eligibility basics
- Ages 21–40 · Women only
- RecruitingHealthy volunteers
Effectiveness of Brief Intervention in Primary Care for Diverse Young People (Chat)
RAND
- Location
- Commerce, CA + 2 other US sites
- Eligibility basics
- Ages 12–19
- RecruitingHealthy volunteers
A Digital Intervention (ACT on Vaping App) for Vaping Cessation in Young Adult E-Cigarette Users
Fred Hutchinson Cancer Center
- Location
- Seattle, WA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Alcohol, Breast Cancer, and Metabolism
University of Illinois at Urbana-Champaign
- Location
- Urbana, IL
- Eligibility basics
- Ages 21–45 · Women only
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.