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
Zinc and Iron Absorption From Common Beans in Young Adult Women
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 19–24 · Women only
- RecruitingHealthy volunteers
Speech Motor Learning and Retention (Aim 1)
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Speech Motor Learning and Retention (Aim 2)
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Effects of a Non-nutritive Sweetener Reduction Intervention in Pregnancy and Lactation on Maternal and Infant Outcomes
George Washington University
- Location
- Washington D.C., DC
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Changes in Inhibition and Valuation After Eating
Icahn School of Medicine at Mount Sinai
- Location
- New York, NY
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Individual Factors of CBT Underlying Success
University of Washington
- Location
- Seattle, WA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
The ROAR Study: Reactive Oxygen Species and Reproduction
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–43
- RecruitingHealthy volunteersPhase 3
Cognitive Strategies in Early Psychosis 1
University of Minnesota
- Location
- Minneapolis, MN
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Study of Placental Function in Healthy and Pathological Pregnancies
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Effects of High Altitude on AMPK Activation
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Autonomic Reactivity and Personalized Neurostimulation
Medical College of Wisconsin
- Location
- Milwaukee, WI
- Eligibility basics
- Ages 11–18 · Women only
- RecruitingHealthy volunteers
Investigating Mediodorsal Thalamus Representations Underlying Human Cognitive Flexibility
Kai Hwang
- Location
- Iowa City, IA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Pilot Study of Suction as a Mechanism of IUD Expulsion With Concomitant Menstrual Cup Use
University of Colorado, Denver
- Location
- Denver, CO
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Lipoprotein Kinetics in T1D
University of Missouri-Columbia
- Location
- Columbia, MO
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
BSGM to Evaluate Patients With GI Symptoms
Children's Hospital of Philadelphia
- Location
- San Diego, CA + 4 other US sites
- Eligibility basics
- Ages 8–25
- RecruitingHealthy volunteers
Cardiovascular Risk and Circadian Misalignment in Short Sleepers - Role of Extended Eating Period
Pennington Biomedical Research Center
- Location
- Baton Rouge, LA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Transcranial Magnetic Stimulation (TMS) Study for Adults With Autism Spectrum Disorder (ASD)
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Telehealth Multi-Component Optional Model (MOM) Study
University of Arkansas
- Location
- Fayetteville, AR + 3 other US sites
- Eligibility basics
- Ages 18–44 · Women only
- RecruitingHealthy volunteers
Impact of Depression on Thermoregulation
Penn State University
- Location
- University Park, PA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Mango Intake and Gut and Cardiometabolic Health in Hispanic/Latino Adolescents
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 12–19
- RecruitingHealthy volunteers
Effects of Acute Sugar Intake on Choroidal Thickness
Southern College of Optometry
- Location
- Memphis, TN
- Eligibility basics
- Ages 21–35
- RecruitingHealthy volunteers
Behavioral Weight Loss Intervention Utilizing Mobile Health Technology in Hematopoietic Stem Cell Transplant Patients
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 13–30
- RecruitingHealthy volunteers
Post-Concussion Musculoskeletal Injury Risks
Walter Reed National Military Medical Center
- Location
- Athens, GA + 1 other US site
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Behavioral and Neural Representations of Subjective Effort Cost
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
- Location
- Baltimore, MD
- 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.