Younger adults · California
Studies for younger adults in California
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.
99 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteers
Combatting HIV Or Other STIs Early (CHOOSE)
Westat
- Location
- San Francisco, CA + 5 other US sites
- Eligibility basics
- Ages 13–24 · Men only
- RecruitingHealthy volunteers
Comparison of Microbiome Changes in Healthy Adults Following Ketone Ester Consumption
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
UCLA REST Study (REsearch on Sleep Techniques)
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–22
- RecruitingHealthy volunteers
Effectiveness of Brief Intervention in Primary Care for Diverse Young People (Chat)
RAND
- Location
- Commerce, CA + 2 other US sites
- Eligibility basics
- Ages 12–19
- RecruitingHealthy volunteers
Shoulder Strength in Baseball Players
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 15–22
- RecruitingHealthy volunteers
Pharmacokinetics, Pharmacodynamics, and Safety Profile of Understudied Drugs Administered to Children Per Standard of Care (POPS)
Duke University
- Location
- Palo Alto, CA + 3 other US sites
- Eligibility basics
- Ages 0 mo–20
- 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
Body Clocks - Coordination of Peripheral and Central Oscillators
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–30 · Women only
- RecruitingHealthy volunteers
Effects of Hypoxic Breathwork
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Social Facilitation of Emotion Regulation in Adolescence
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 13–25
- RecruitingHealthy volunteers
Health-E You Efficacy Trial for Male Adolescents
Johns Hopkins University
- Location
- Oakland, CA + 7 other US sites
- Eligibility basics
- Ages 13–21 · Men only
- RecruitingHealthy volunteers
Sexual Health Advocacy for Guys - a Text Messaging-based HIV Prevention Program for Guys Who Are Into Guys
Center for Innovative Public Health Research
- Location
- San Clemente, CA
- Eligibility basics
- Ages 13–22 · Men only
- RecruitingHealthy volunteers
Abuse Liability and Appeal of Oral Nicotine Products
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 21–25
- RecruitingHealthy volunteers
Immunomodulatory Effects of Fasting in Healthy Adults
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 20–40
- RecruitingHealthy volunteers
Developing a Nutritional Supplement to Increase Collagen Synthesis in People
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Impact of Lactation Antenatal Teaching by Clinicians and Healthcare Providers
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Behavioral Activation and Risk Reduction for Stimulant Use Among Sexually Active Adolescents and Young Adults
Westat
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 16–24
- RecruitingHealthy volunteers
Comparing Two School-Based Sleep Health Interventions To Promote Sleep Quality in Youth
Children's Hospital Los Angeles
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 12–18
- 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
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
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
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
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