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
Hippocampal and Frontoparietal Development and Inference
University of Texas at Austin
- Location
- Austin, TX
- Eligibility basics
- Ages 13–25
- RecruitingHealthy volunteers
Engaging College Students in Developing and Testing a Video-based Intervention for HPV Vaccination Promotion
Michigan State University
- Location
- East Lansing, MI
- Eligibility basics
- Ages 18–26
- RecruitingHealthy volunteers
Impact of Room Light on Uterine Contractions and Labor Progression in Pregnancy
Michigan State University
- Location
- East Lansing, MI
- Eligibility basics
- Ages 18–42 · Women only
- RecruitingHealthy volunteers
Weight Loss and Physical Fitness Following Pregnancy in Active Duty Women
Tripler Army Medical Center
- Location
- Honolulu, HI + 1 other US site
- Eligibility basics
- Ages 18–44 · Women only
- RecruitingHealthy volunteersPhase 4
Characterizing the Human Airway Immune Response to FluMist Vaccination
Washington University School of Medicine
- Location
- St Louis, MO
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
MIRA CONNECT Study
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
Muscle Response to Different Amounts of Dietary Protein During Leg Immobilization
United States Army Research Institute of Environmental Medicine
- Location
- Natick, MA
- Eligibility basics
- Ages 17–39
- RecruitingHealthy volunteers
The Role of Mobile Apps in Promoting Cardiovascular Health and Motivation to Exercise During Pregnancy
Old Dominion University
- Location
- Norfolk, VA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Improving Neck Control in Children With Cerebral Palsy Using Robotics
Columbia University
- Location
- New York, NY
- Eligibility basics
- Ages 11–21
- RecruitingHealthy volunteers
Augmented Reality For MRI-Guided Interventions
Children's National Research Institute
- Location
- Washington D.C., DC
- Eligibility basics
- Ages 3–21
- RecruitingHealthy volunteers
InformationSeekingMesolimbicEngagementStudy2
Temple University
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Efficacy of a Smart Water Bottle Intervention to Increase Fluid Consumption in College Students
Kennesaw State University
- Location
- Kennesaw, GA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Alcohol and the Social Brain: An Alcohol-Administration Hyperscanning Study Employing a Within-Subject Design
University of Illinois at Urbana-Champaign
- Location
- Champaign, IL
- Eligibility basics
- Ages 21–30
- RecruitingHealthy volunteers
Real-time fMRI for Insular Cortex Brain State-triggered Experience Sampling
Drexel University
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Connect to Baby: A Pilot Study of a Parenting and Coparenting Program
Georgetown University
- Location
- Washington D.C., DC
- Eligibility basics
- Ages 2 mo–40
- RecruitingHealthy volunteers
Attitudes and Perceptions Attitudes and Smoking Perceptions in the Real Environment -II
University of Oklahoma
- Location
- Oklahoma City, OK
- Eligibility basics
- Ages 18–34
- RecruitingHealthy volunteers
Cognitive Control & the Functional Organization of the Frontal Cortex
Brown University
- Location
- Providence, RI
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Social Facilitation of Alcohol Effects and Alcohol Misuse in Young Adults
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 21–28
- RecruitingHealthy volunteers
The K-Map Study, Global Prevalence of KC
University Hospital, Geneva
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 6–23
- RecruitingHealthy volunteers
Vape-Free Text-Messaging: Pilot Study
Jovan Gwon, PhD, RN, FIAAN
- Location
- Milwaukee, WI
- Eligibility basics
- Ages 18–24
- RecruitingHealthy volunteers
Effects of a Specific Substance in Smokers
Oregon Health and Science University
- Location
- Portland, OR
- Eligibility basics
- Ages 21–40
- RecruitingHealthy volunteers
Countermeasures to Circadian Misalignment
Colorado State University
- Location
- Fort Collins, CO
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Stress and Resilience
University of Washington
- Location
- Dallas, TX + 1 other US site
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Ketone Monoester Supplements, High Altitude, and Brain Blood Flow During Exercise
McMaster University
- Location
- Bishop, CA
- Eligibility basics
- Ages 18–35
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.