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
- RecruitingPhase 3
Human Menopausal Gonadotropin Research in Infertility Assessing Cumulative Live Birth With Frozen Embryo Transfer.
Granata Bio Corporation
- Location
- Encino, CA + 14 other US sites
- Eligibility basics
- Ages 18–42 · Women only
- RecruitingPhase 2
A Study of Belumosudil in Children With Chronic Graft Versus Host Disease (schoolROCK)
Sanofi
- Location
- Los Angeles, CA + 6 other US sites
- Eligibility basics
- Ages 1–18
- RecruitingPhase 2
HMBeacon: A Phase 2 Study to Evaluate ALN-6400 in Adult and Adolescent Female Patients With VWD and HMB
Alnylam Pharmaceuticals
- Location
- Orange, CA + 5 other US sites
- Eligibility basics
- Ages 16–45 · Women only
- RecruitingPhase 3
Brexanolone Lifting Outcomes Of Moms
Lipocine Inc.
- Location
- Canoga Park, CA + 15 other US sites
- Eligibility basics
- Ages 15–45 · Women only
- RecruitingPhase 1/Phase 2
CNP-103 in Adolescent and Adult Subjects Ages 12-35 With Recently Diagnosed (Within 6 Months) Stage 3 Type 1 Diabetes (T1D)
COUR Pharmaceutical Development Company, Inc.
- Location
- Newport Beach, CA + 44 other US sites
- Eligibility basics
- Ages 12–35
- RecruitingPhase 3
Study to Assess the Efficacy, Pharmacokinetics, Safety and Tolerability of Iptacopan in Pediatric Patients With Primary IgAN
Novartis Pharmaceuticals
- Location
- Madera, CA + 4 other US sites
- Eligibility basics
- Ages 2–18
- RecruitingPhase 1/Phase 2
Study of Intrathecal ELP-02 for Charcot-Marie-Tooth Disease Type 4J (CMT4J)
Elpida Therapeutics SPC
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 3–20
- RecruitingPhase 1/Phase 2
Study to Evaluate Safety, Efficacy and Immunogenicity of Acne mRNA Vaccine in Adults With Moderate to Severe Acne
Sanofi Pasteur, a Sanofi Company
- Location
- Cerritos, CA + 78 other US sites
- Eligibility basics
- Ages 18–45
- Recruiting
This Study Aims to Evaluate Whether Milamend's Product Could Improve Hormone Balance in Women Who Suffer From Self-reported PCOS Symptoms.
Mila Mend Inc.
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingPhase 3
A Clinical Trial of Elsunersen in Pediatric SCN2A-DEE to Assess Efficacy and Safety
Praxis Precision Medicines
- Location
- San Diego, CA + 5 other US sites
- Eligibility basics
- Ages 0 mo–18
- RecruitingPhase 1/Phase 2
Phase 1/2 Study of MZ-1866, an AAV-9 Gene Therapy Delivered by Intracerebroventricular Injection to Participants With Pitt Hopkins Syndrome
Mahzi Therapeutics
- Location
- Oakland, CA + 2 other US sites
- Eligibility basics
- Ages 2–25
- RecruitingPhase 1
Assessing the Safety, Tolerability, and Efficacy of APR-2020 in Pediatric and Adolescent Subjects With RPS19 Deficient Diamond-Blackfan Anemia
Apriligen, Inc.
- Location
- Stanford, CA + 1 other US site
- Eligibility basics
- Ages 2–25
- RecruitingPhase 3
Beeline: A Phase 3 Study in GRIN-related Neurodevelopmental Disorder
GRIN Therapeutics, Inc.
- Location
- Los Angeles, CA + 15 other US sites
- Eligibility basics
- Ages 1 mo–18
- RecruitingPhase 3
A Study to Learn About the Study Medicine Called Rimegepant in Women When Used for Intermittent Prevention of Menstrual Migraine
Pfizer
- Location
- Canoga Park, CA + 30 other US sites
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingPhase 1/Phase 2
Study to Evaluate Safety, Efficacy and Immunogenicity of Acne mRNA Vaccine in Participants With Mild Acne
Sanofi Pasteur, a Sanofi Company
- Location
- Encino, CA + 3 other US sites
- Eligibility basics
- Ages 18–45
- RecruitingPhase 1/Phase 2
A Study Exploring Changes in a Variety of Biomarkers Following Dosing With MT1988 in Participants at Clinical High Risk for Psychosis
Monument Therapeutics Limited
- Location
- Irvine, CA + 14 other US sites
- Eligibility basics
- Ages 17–30
- RecruitingPhase 3
To Investigate the Efficacy of Treatment With Oral NA-921 (Bionetide) Versus Placebo in Females With Rett Syndrome
Biomed Industries, Inc.
- Location
- La Jolla, CA + 13 other US sites
- Eligibility basics
- Ages 5–20 · Women only
- RecruitingPhase 3
A Trial of Etelcalcetide in Pediatric Participants With Secondary Hyperparathyroidism and Chronic Kidney Disease on Hemodialysis
Amgen
- Location
- Los Angeles, CA + 4 other US sites
- Eligibility basics
- Ages 0 mo–18
- Recruiting
Effectiveness of the SoundHeal Multi-Sensory Integrative Therapy Among Justice-Involved Youth
SoundHeal
- Location
- San Luis Obispo, CA
- Eligibility basics
- Ages 12–18
- RecruitingPhase 3
Fontan Udenafil Exercise Longitudinal Assessment Trial - 2
Mezzion Pharma Co. Ltd
- Location
- Los Angeles, CA + 34 other US sites
- Eligibility basics
- Ages 12–18
- RecruitingHealthy volunteers
Trial Evaluating Nutritional Fiber in Digestive Symptoms of Endometriosis
LOAM Science
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Very Brief Exposure: Development of a Novel Exposure Modality for Social Anxiety Disorder in Transition-Age Youth
Children's Hospital Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 16–22
- RecruitingHealthy volunteers
Linking Youth to Pre-Exposure Prophylaxis (PrEP) Services
Westat
- Location
- San Francisco, CA + 3 other US sites
- Eligibility basics
- Ages 13–24
- RecruitingHealthy volunteers
UCLA Magnesium Formulation Athlete Study
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–35