Location · California
Clinical trials recruiting in California
1898 recruiting studies have at least one site in California; 701 accept healthy volunteers. Studies that need a specific condition are included too, so check each listing.
Want the research companies that run paid Phase 1 studies for healthy volunteers? Paid clinical trial companies in California.
1,898 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
More recruiting studies (pay not posted)
- RecruitingHealthy volunteers
Molecular Optimization Via Exercise (MOVE)
Buck Institute for Research on Aging
- Location
- Novato, CA
- Eligibility basics
- Ages 65–80
- RecruitingHealthy volunteersPhase 2
PrEPsmart 2-1-1 Pilot
Public Health Foundation Enterprises, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
Next Generation Chest X-Ray Tomosynthesis for Screening of Lung Cancer
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 30–85
- RecruitingHealthy volunteers
Liquid Biopsies in Pediatric Solid Tumors
Children's Hospital Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 6 mo+
- RecruitingHealthy volunteers
Research Framework Exploring Sleep Health
Scripps Translational Science Institute
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+
- 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
- RecruitingHealthy volunteers
Wound Irrigation Comparative Effectiveness Study
Orthopaedic Education and Research Institute (dba Hoag Orthopedics)
- Location
- Orange, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
POWERMOM, A Healthy Pregnancy Research Community
Scripps Translational Science Institute
- Location
- La Jolla, CA
- Eligibility basics
- Ages 16+ · Women only
- RecruitingHealthy volunteers
MyGeneRank: A Digital Platform for Next-Generation Genetic Studies
Scripps Translational Science Institute
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Comparing the Stanford Letter Project Form to Traditional Advance Directives
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
An Adaptive Clinical Trial of BeginNGS Newborn Screening for Hundreds of Genetic Diseases by Genome Sequencing
Rady Pediatric Genomics & Systems Medicine Institute
- Location
- San Diego, CA
- Eligibility basics
- Ages 0 mo–1 mo
- RecruitingHealthy volunteers
Enroll -HD: A Prospective Registry Study in a Global Huntington's Disease Cohort
CHDI Foundation, Inc.
- Location
- Irvine, CA + 51 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Focal Therapy for Localized Prostate Cancer
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
Use of Continuous Glucose Monitors in Children and Adolescents With Obesity
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 10–21
- RecruitingHealthy volunteers
MS-ResearchBiomarkerS
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Evaluating the Impact of Training for IHSS Workers
Abdul Latif Jameel Poverty Action Lab
- Location
- San Bernardino, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Capsule Microbiota Sampling in IBS/Functional Gastrointestinal Disease
Stanford University
- Location
- Redwood City, CA
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteers
Achieving Steady Work Among Adults With Autism Through Specialized Employment Program
Lawrence Fung
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteers
Site and Mechanism(s) of Expiratory Airflow Limitation in COPD, Emphysema and Asthma-COPD Overlap
Gelb, Arthur F., M.D.
- Location
- Lakewood, CA
- Eligibility basics
- Ages 30+
- RecruitingHealthy volunteers
Adherence to Different Exercise Interventions
California Polytechnic State University-San Luis Obispo
- Location
- San Luis Obispo, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Cardiac Magnetic Resonance Imaging (MRI) Normal Reference Control Group Testing
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 35–65 · Women only
- RecruitingHealthy volunteers
Development of a Novel Stress Testing Protocol to Define the Relationship Between Coronary Microvascular Dysfunction and Diastology in Women With Angina But No Evidence of Obstructive Coronary Artery Disease
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–60 · Women only
- RecruitingHealthy volunteers
Neuroimaging Biomarkers for Predicting rTMS Response in OCD
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Rady Children's Institute Genomic Biorepository
Rady Pediatric Genomics & Systems Medicine Institute
- Location
- San Diego, CA
- Eligibility basics
- Any age listed