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 volunteersEarly Phase 1
Predictors of Aspirin Failure in Preeclampsia Prevention
Rockefeller University
- Location
- New York, NY
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersPhase 1
Azithromycin Before Induction
Arrowhead Regional Medical Center
- Location
- Colton, CA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersEarly Phase 1
Sensitivity of Angiotensin II Type II Receptors in Women Following Preeclampsia
Anna Stanhewicz, PhD
- Location
- Iowa City, IA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersEarly Phase 1
Comparing Approaches to Assess Nitric Oxide-dependent Cutaneous Vasodilation
University of Iowa
- Location
- Iowa City, IA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteersEarly Phase 1
Study to Assess Potential Impairments in Estradiol Augmentation of Gonadotropin Secretion in Polycystic Ovary Syndrome
University of Virginia
- Location
- Charlottesville, VA
- Eligibility basics
- Ages 18–30 · Women only
- RecruitingHealthy volunteersEarly Phase 1
Intradermal Influenza Vaccination
Yale University
- Location
- New Haven, CT
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteersEarly Phase 1
Metformin for the Treatment of Microvascular Dysfunction After Gestational Diabetes
Anna Stanhewicz, PhD
- Location
- Iowa City, IA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersPhase 1/Phase 2
Investigating Whether Acute Elevation of Fatty Acid Levels Alters Cerebral Glucose Transport and Metabolism
University of North Carolina, Chapel Hill
- Location
- Chapel Hill, NC + 1 other US site
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteersPhase 1
Maternal Choline Supplementation and Cannabis Use During Pregnancy: Impact on Early Brain Development
University of Colorado, Denver
- Location
- Aurora, CO
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteersOvernight stay mentioned
Suicide Treatment Alternatives for Teens
Children's Hospital Medical Center, Cincinnati
- Location
- Glen Oaks, NY + 2 other US sites
- Eligibility basics
- Ages 12–18
- RecruitingHealthy volunteersPhase 1
Treating Primary Sclerosing Cholangitis and Biliary Atresia With Vancomycin
Sacramento Pediatric Gastroenterology
- Location
- Sacramento, CA
- Eligibility basics
- Ages 0 mo–40
- RecruitingHealthy volunteersPhase 2
A Study Assessing Safety, Tolerability, and Efficacy of INNA-051 in Preventing Respiratory Illness Due to Viral Infections in Healthy Adults 18 to 45 Years of Age
ENA Respiratory Pty Ltd
- Location
- Baltimore, MD + 5 other US sites
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
A Clinical Trial to Evaluate the Effects of the Kaia Relief - Cycle System on Premenstrual Symptom Severity, Menstrual Discomfort, and Overall Well-Being in Premenopausal Women.
Vivance Group
- Location
- Las Vegas, NV
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Contraceptive Efficacy Study of Ovaprene
Daré Bioscience, Inc.
- Location
- Phoenix, AZ + 3 other US sites
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteersPhase 3
Fertilo In Vitro Research Study and Trial
Gameto, Inc.
- Location
- Clovis, CA + 15 other US sites
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteers
Integration of the Oura Ring and Maven Clinic Among Women Who Are Trying to Conceive
Ouraring Inc.
- Location
- New York, NY
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Evaluation of Approved Contact Lenses (CR-6657)
Johnson & Johnson Vision Care, Inc.
- Location
- Franklin Park, IL + 3 other US sites
- Eligibility basics
- Ages 18–39
- RecruitingHealthy volunteers
Wearable Photoplethysmography for Non-invasive Hydration Assessment
PepsiCo Global R&D
- Location
- Frisco, TX + 1 other US site
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Women's Hormonal and Metabolic Wellbeing Study
Daily Nouri
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
A Study to Learn About the Safety of PENBRAYA During Pregnancy
Pfizer
- Location
- New York, NY
- Eligibility basics
- Ages 10–25 · Women only
- RecruitingHealthy volunteers
A Clinical Trial to Evaluate the Effects of a Powder Supplement in Supporting Lean Muscle Development, Hormone-Related Wellness, Digestive Comfort, Dermatologic Health, and Overall Wellness
Clean Nutraceuticals
- Location
- Las Vegas, NV
- Eligibility basics
- Ages 21–45
- RecruitingHealthy volunteers
Effects of Eggshell Membrane and Curcumin Extract Supplementation, Separately or Combined, on Recovery From Intense Exercise
ESM Technologies, LLC
- Location
- College Station, TX
- Eligibility basics
- Ages 18–40 · Men only
- RecruitingHealthy volunteers
Establishing Normative Urodynamics Parameters for the Glean Urodynamics System in Healthy Adults
Bright Uro
- Location
- Phoenix, AZ + 2 other US sites
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Philips FAST SpO2 Technology With Masimo Sensors for SpO2 Monitoring in the Neonatal, Infant, and Pediatric Populations
Masimo Corporation
- Location
- Modesto, CA + 1 other US site
- Eligibility basics
- Ages 0 mo–21
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.