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
Effect of Ashwagandha Root Extract on Stress, Anxiety, and Sleep Quality in Adults Experiencing Minority Stress
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Ketogenic Diet and Brain Response in Anorexia Nervosa
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Pneumatic Compression vs Blood Flow Restriction for Muscle Recovery
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
My Life and My Experiences Project
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 12–18
- RecruitingHealthy volunteers
Examining the Role of Female Endogenous Sex Hormones in Eccentric Exercise
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–35 · Women only
- 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
The ROAR Study: Reactive Oxygen Species and Reproduction
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–43
- 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
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
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
Patient-centered Information on Permanent Contraception
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 21–45 · Women only
- RecruitingHealthy volunteersPhase 4
Androgen Effects on the Reproductive Neuroendocrine Axis, 2025 Version
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteers
BrainWeighve App Feasibility Study
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 14–21
- RecruitingHealthy volunteers
Testing a Gender-inclusive HIV Prevention Program
Center for Innovative Public Health Research
- Location
- San Clemente, CA
- Eligibility basics
- Ages 14–18 · Men only
- RecruitingHealthy volunteersPhase 4
Effects of Energy Drinks on Cardiovascular Endpoints
University of the Pacific
- Location
- Stockton, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Neurophysiologic Biomarkers in Rett Syndrome
Children's Hospital of Philadelphia
- Location
- Los Angeles, CA + 5 other US sites
- Eligibility basics
- Ages 1–18 · Women only
- RecruitingHealthy volunteers
A Research Study Exploring How Musculoskeletal Function and the Autonomic Nervous System Relate to Visceral Pain in Women With and Without Dysmenorrhea (Painful Periods).
Azusa Pacific University
- Location
- Azusa, CA
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteers
Social Facilitation of Alcohol Effects and Alcohol Misuse in Young Adults
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 21–28
- RecruitingHealthy volunteers
The K-Map Study, Global Prevalence of KC
University Hospital, Geneva
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 6–23
- RecruitingHealthy volunteers
Ketone Monoester Supplements, High Altitude, and Brain Blood Flow During Exercise
McMaster University
- Location
- Bishop, CA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
TrialNet Pathway to Prevention of T1D
University of South Florida
- Location
- Orange, CA + 16 other US sites
- Eligibility basics
- Ages 2–45
- RecruitingHealthy volunteers
CYP2C19 Variants and Limonene Metabolism
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Blood Flow Restriction Training on Upper Extremity Grip Strength
Casa Colina Hospital and Centers for Healthcare
- Location
- Pomona, CA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Effectiveness of Dual Light Electric Toothbrush vs. Manual Toothbrush in Orthodontic Patients Undergoing Oral Surgery
Children's Hospital Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 6–20