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
A Prospective Longitudinal Observational Cohort Study of Pregnant Women Residing at High Altitude in Bolivia
Massachusetts General Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Acceptability of Soy Milk as a Calcium-Rich Beverage in School Children in New York City Public Schools
Physicians Committee for Responsible Medicine
- Location
- Elmhurst, NY + 5 other US sites
- Eligibility basics
- Ages 5–18
- RecruitingHealthy volunteers
Neural and Hormonal Influences on Sex Differences in Risk for AUD
Jessica Weafer
- Location
- Columbus, OH
- Eligibility basics
- Ages 21–26
- RecruitingHealthy volunteers
Multi-Component Breath Alcohol Intervention Phase 3
Northeastern University
- Location
- Boston, MA
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteers
Neural Correlates of Stress and Perceived Control in Adolescent Depression
Mclean Hospital
- Location
- Belmont, MA
- Eligibility basics
- Ages 14–18 · Women only
- RecruitingHealthy volunteers
Gathering Online for Dialogue and Discussion to Enhance Social Support
RTI International
- Location
- Durham, NC
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Effect of Mindfulness-based Neurofeedback for Adolescents With Elevated Repetitive Negative Thinking
Massachusetts General Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 13–21
- RecruitingHealthy volunteersPhase 2
Pharmaco-Neuroimaging Studies of Approach/Avoidance Behaviors and Post-Mortem Studies: Pharmacological Manipulation
Mclean Hospital
- Location
- Belmont, MA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Testing Effects of Melatonin on Uterine Contractions in Women
Brigham and Women's Hospital
- Location
- Boston, MA
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteers
The Metabolic Effects of Intermittent Fasting
University of Pittsburgh
- Location
- Pittsburgh, PA
- Eligibility basics
- Ages 21–45
- RecruitingHealthy volunteers
The Collaborative Care PrTNER Study
Children's Hospital of Philadelphia
- Location
- Philadelphia, PA
- Eligibility basics
- Ages 15–29 · Men only
- RecruitingHealthy volunteers
Blood Flow Restriction Training as a Targeted Intervention for Rowers With Back Pain.
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 13–20
- RecruitingHealthy volunteers
Early Detection of Vaping-related Vascular Diseases
University of Miami
- Location
- Miami, FL
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Sex Differences in Cold-Induced Changes in Maximal Fat Oxidation
Colorado State University
- Location
- Fort Collins, CO
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Clinical Performance of Verofilcon A Toric Contact Lenses
Southern College of Optometry
- Location
- Memphis, TN
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Evaluation of Stepping Stones
The Policy & Research Group
- Location
- New Orleans, LA
- Eligibility basics
- Ages 12–22
- RecruitingHealthy volunteers
Low Energy Availability and Hypertension in Division I HBCU Athletes
North Carolina Agriculture & Technical State University
- Location
- Greensboro, NC
- Eligibility basics
- Ages 18–26
- RecruitingHealthy volunteers
The Early and Late Contribution of Fasting and Postprandial Triglycerides on Newborn Subcutaneous and Intrahepatic Fat in Pregnancy
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 0 mo–39
- RecruitingHealthy volunteers
Nen ŨnkUmbi/EdaHiYedo Plus (We Are Here Now Plus): a Multi-level Intervention to Reduce Health Disparities Among American Indian Youth
Montana State University
- Location
- Bozeman, MT
- Eligibility basics
- Ages 12–18
- RecruitingHealthy volunteers
A Study to See if an iPhone Weight Management App Can Help Promote Weight Loss in Adolescents and Young Adults After a Stem Cell Transplant
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 13–30
- RecruitingHealthy volunteers
Night Owl Metabolism
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 18–23
- RecruitingHealthy volunteers
Growth Hormone Resistance of Beta-cells A
University of Missouri-Columbia
- Location
- Columbia, MO
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Cigar Legislation and Regulation in Tobacco for the Young (Project CLARITY)
University of Oklahoma
- Location
- Oklahoma City, OK
- Eligibility basics
- Ages 18–24
- RecruitingHealthy volunteers
Effectiveness of Relationship Education for Reducing HIV Incidence Among Men Who Have Sex With Men
Northwestern University
- Location
- Chicago, IL
- Eligibility basics
- Ages 16–34
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.