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
Intermediate Visual Space Perception
University of Louisville
- Location
- Louisville, KY
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
StuDy AimED at Increasing AlCohol AbsTinEnce
University of Illinois at Chicago
- Location
- Chicago, IL
- Eligibility basics
- Ages 18–24
- RecruitingHealthy volunteers
Slowly Digestible Carbohydrates for GLP-1 Secretion
Purdue University
- Location
- West Lafayette, IN
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteersPhase 2
Relationship Between Abnormal Myocardial Perfusion and Diastolic Dysfunction in Sickle Cell Disease Using PET
St. Jude Children's Research Hospital
- Location
- Memphis, TN
- Eligibility basics
- Ages 18–21
- RecruitingHealthy volunteers
School Screening and Telemedicine Specialty Referral to Address Childhood Hearing Loss in Rural Alaska
University of Arkansas
- Location
- Anchorage, AK
- Eligibility basics
- Ages 3–21
- RecruitingHealthy volunteers
Detection of Vocal Fold Motion Impairment on Noninvasive Positive Pressure
Nemours Children's Clinic
- Location
- Queens, NY
- Eligibility basics
- Ages 0 mo–18
- RecruitingHealthy volunteers
Pilot Study of Mindset Moments Among Adolescent and Young Adult Cancer Survivors
Duke University
- Location
- Durham, NC
- Eligibility basics
- Ages 19–25
- RecruitingHealthy volunteers
Neural Basis of Sensory Learning: Brain Regions
Indiana University
- Location
- Bloomington, IN
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Surgical Treatment of Recurrent Shoulder Dislocations
Nova Scotia Health Authority
- Location
- New York, NY
- Eligibility basics
- Ages 16–40
- RecruitingHealthy volunteers
LPFC Organization in Emotion-Duration Difference Estimation
University of California, Santa Barbara
- Location
- Santa Barbara, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteersPhase 2
Regulation of Affect and Physiology in Depression
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–27
- RecruitingHealthy volunteers
RHI Interval Effects on Brain Health
Indiana University
- Location
- Bloomington, IN
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Effects of a 5-Week Probiotic Supplementation Intervention on Markers of Delayed Onset Muscle Soreness
University of Minnesota
- Location
- Minneapolis, MN
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Timing of Energy Availability on Menstrual Cycle Function
University of Colorado, Colorado Springs
- Location
- Colorado Springs, CO
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
Avoidance-driven Decision Making and Learning in Anorexia Nervosa and Bulimia Nervosa
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18–39 · Women only
- RecruitingHealthy volunteers
Daoist Zhanzhuang and Human Flourishing
University of North Carolina, Charlotte
- Location
- Charlotte, NC
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteersPhase 2
Probiotic Supplementation in Optimizing Iron and Hematological Status Among Pregnant Females
University of Illinois at Chicago
- Location
- Chicago, IL
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Diet Synergy in Muscle Protein Synthesis
University of Illinois at Urbana-Champaign
- Location
- Urbana, IL
- Eligibility basics
- Ages 19–40
- RecruitingHealthy volunteers
Influences of Long-acting Reversible Contraceptives on Iron Status and Physiological Responses to Extreme Environments in Women
United States Army Research Institute of Environmental Medicine
- Location
- Natick, MA
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
The SKyRoCKeT Study
University of North Carolina, Charlotte
- Location
- Charlotte, NC
- Eligibility basics
- Ages 6–20
- RecruitingHealthy volunteers
Omega-3 Fatty Acids and Subconcussive Head Impacts
Indiana University
- Location
- Bloomington, IN
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Predictors of Pregnancy Outcome in Systemic Lupus Erythematosus (SLE) and Antiphospholipid Syndrome (APS)
Hospital for Special Surgery, New York
- Location
- New York, NY + 2 other US sites
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Incentive Processing and Learning in Anorexia Nervosa and Bulimia Nervosa
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18–39 · Women only
- RecruitingHealthy volunteers
Early PKD Observational Cohort Study
University of Kansas Medical Center
- Location
- Chicago, IL + 2 other US sites
- Eligibility basics
- Ages 4–35
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.