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
Screen2Prevent (S2P)
Westat
- Location
- Tampa, FL + 4 other US sites
- Eligibility basics
- Ages 14–24
- RecruitingHealthy volunteersPhase 2
Respiratory and Real-time Dynamics in Exercise-Induced Paradoxical Vocal Fold Motion
Indiana University
- Location
- Bloomington, IN
- Eligibility basics
- Ages 18–26
- RecruitingHealthy volunteers
Sleep Restriction and Parental History of Hypertension
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Sauna for Offline Connections and Interactive, Authentic Living
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 19–25
- RecruitingHealthy volunteers
Does Style Matter: Comparison of Moderate- to Low-intensity Styles of Yoga
Caitlin Cheruka
- Location
- Orlando, FL
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Body Clocks - Coordination of Peripheral and Central Oscillators
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–30 · Women only
- RecruitingHealthy volunteersPhase 4
Etonogestrel Implant as Emergency Contraception
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteersPhase 2/Phase 3
Uterus Transplantation to Treat Infertility
Johns Hopkins University
- Location
- Baltimore, MD
- Eligibility basics
- Ages 18–38 · Women only
- RecruitingHealthy volunteers
Understanding the Associations Between Romantic Relationship Conflict, Psychophysiological Responding and Alcohol Misuse Among Emerging Adults
New York University
- Location
- New York, NY
- Eligibility basics
- Ages 21–29
- RecruitingHealthy volunteers
Location- and Frequency-Dependent Effects of Thalamic Temporal Interference Stimulation During Sleep
University of Wisconsin, Madison
- Location
- Madison, WI
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Multi-Site Feasibility Testing a Meditation App for Youth in the Legal System
University of Illinois at Chicago
- Location
- Chicago, IL
- Eligibility basics
- Ages 13–20
- RecruitingHealthy volunteers
Maternal Mindfulness: Depression and Postpartum Pain
University of Illinois at Urbana-Champaign
- Location
- Champaign, IL
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
A Sensory Strategy to Cut Sugary Beverages in African/American and Latine Adolescents
Nana Gletsu Miller
- Location
- Indianapolis, IN + 1 other US site
- Eligibility basics
- Ages 12–18
- RecruitingHealthy volunteers
Circadian Intervention to Improve Cardiometabolic Health
University of Utah
- Location
- Salt Lake City, UT
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Metabolic and Physiologic Responses to Hormone Therapy in Transgender and Gender Diverse People
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Effect of Sleep Extension on Ceramides in People With Overweight and Obesity
University of Utah
- Location
- Salt Lake City, UT
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Prospective Evaluation of Pathways for Preterm Birth
John O'Brien, MD
- Location
- Lexington, KY
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Effects of Hypoxic Breathwork
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Gestational Response, Outcomes, and Weight After GLP-1 Use
University of Kansas Medical Center
- Location
- Kansas City, KS
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Providing Access to the Visual Environment
Vanderbilt University
- Location
- Nashville, TN
- Eligibility basics
- Ages 3–21
- RecruitingHealthy volunteersPhase 2
Kick-Nic! Youth Quit Vaping App
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 12–19
- RecruitingHealthy volunteers
Functional Evaluation in Patients With Urea Cycle Disorders (UCD) During a Driving Task
St. Jude Children's Research Hospital
- Location
- Memphis, TN
- Eligibility basics
- Ages 16–40
- RecruitingHealthy volunteers
Maternal Smoking Cessation and Pediatric Obesity Prevention
State University of New York at Buffalo
- Location
- Buffalo, NY
- Eligibility basics
- Ages 18–39 · Women only
- RecruitingHealthy volunteers
Venous Compression in Fontan
University of Texas Southwestern Medical Center
- Location
- Dallas, TX
- Eligibility basics
- Ages 18–45
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.