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
Rise With Resilience
Emory University
- Location
- Atlanta, GA
- Eligibility basics
- Ages 18–26
- RecruitingHealthy volunteers
Virtual Village for Young Parents
RTI International
- Location
- Durham, NC
- Eligibility basics
- Ages 16–21
- RecruitingHealthy volunteers
Validation of Clinical Outcome Measures Specific to mTBI-Related Oculomotor Disorders
Salus University
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Diet and Motility in IBS
Children's Hospital of Philadelphia
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 8–18
- RecruitingHealthy volunteers
MRI Assessment of Placental Health
Boston Children's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Early Life Stress and Depression: Molecular and Functional Imaging
Mclean Hospital
- Location
- Belmont, MA
- Eligibility basics
- Ages 20–32 · Women only
- RecruitingHealthy volunteers
Microvascular Dysfunction in Obesity
Florida State University
- Location
- Tallahassee, FL
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Pediatric Hypertension and the Renin-Angiotensin SystEm (PHRASE)
Wake Forest University Health Sciences
- Location
- Winston-Salem, NC
- Eligibility basics
- Ages 7–18
- RecruitingHealthy volunteers
The Iowa ACEs and Sleep Cohort and Manipulating Sleep in Young Adults With ACEs Studies
Nathaniel Jenkins
- Location
- Iowa City, IA
- Eligibility basics
- Ages 18–29
- RecruitingHealthy volunteers
Impact of Native Chicory Inulin on Change and Persistence of Gut Microbiota
Purdue University
- Location
- West Lafayette, IN
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Home BP Monitoring
University Hospitals Cleveland Medical Center
- Location
- Cleveland, OH
- Eligibility basics
- Ages 13–18
- RecruitingHealthy volunteers
Examining Neurobiological Mechanisms Underlying the Therapeutic Effect of the Ketogenic Diet in Bipolar Disorder (BD)
University of Pittsburgh
- Location
- Pittsburgh, PA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Furthering Equity Through Infant Feeding EDucation and Support
Endeavor Health
- Location
- Chicago, IL + 2 other US sites
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Advanced Fetal Imaging - Phase II
Boston Children's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
SMYLS Multi-site Trial
Medical University of South Carolina
- Location
- Charleston, SC
- Eligibility basics
- Ages 14–21
- RecruitingHealthy volunteers
Testing a Gender-inclusive HIV Prevention Program
Center for Innovative Public Health Research
- Location
- San Clemente, CA
- Eligibility basics
- Ages 14–18 · Men only
- RecruitingHealthy volunteers
Blood Flow Restriction Following Hip Arthroscopy
Rush University Medical Center
- Location
- Chicago, IL
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Brain Blood Flow and Lactate in Non-obese and Obese Subjects
University of Missouri-Columbia
- Location
- Columbia, MO
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Acuvue Oaysis Contact Lens Wearers Being Refit Into P7 Contact Lenses
Southern College of Optometry
- Location
- Memphis, TN
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Studying the Effects of Nicotine Concentration and Flavor on Alcohol Use in Young Adults
Ohio State University Comprehensive Cancer Center
- Location
- Columbus, OH
- Eligibility basics
- Ages 21–30
- RecruitingHealthy volunteersPhase 4
Effects of Energy Drinks on Cardiovascular Endpoints
University of the Pacific
- Location
- Stockton, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Probing the Role of Mitochondrial Oxidative Stress in Impaired Vascular Function Among Young Adults With Early Life Adversity
University of Iowa
- Location
- Iowa City, IA
- Eligibility basics
- Ages 18–29
- RecruitingHealthy volunteers
Temperature Rise Caused by Short or Long-wavelengths
University of Florida
- Location
- Gainesville, FL
- Eligibility basics
- Ages 21–35
- RecruitingHealthy volunteers
Examining the Impact of Exercise Training on Vascular Dysfunction in Individuals With Mental Health Disorders - Study 2
Virginia Commonwealth University
- Location
- Richmond, VA
- 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.