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
Virtual Reality Interventions for the Improvement of Depression, Anxiety and Pain in Patients With Head and Neck Cancer and Caregivers
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Mirai-MRI: Validation of AI Models for Breast Cancer Risk
University of California, San Francisco
- Location
- San Francisco, CA + 1 other US site
- Eligibility basics
- Ages 40–89 · Women only
- RecruitingHealthy volunteers
Preparedness Through Respiratory Virus Epidemiology and Community Engagement
University of California, San Diego
- Location
- La Jolla, CA + 1 other US site
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
eMOTION: Examining Implicit Attitudes in Physical Activity Engagement
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Visible Abdominal Distension
Hospital Universitari Vall d'Hebron Research Institute
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 4
Anticoagulation Profile in Pregnant Women Treated With Three Times a Day of Low Molecular Weight Heparin (LMWH)
University of California, Irvine
- Location
- Orange, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Diagnostic Innovations in Glaucoma Study
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
SPL Insufficiency Syndrome (SPLIS)/NPHS14: a SPLIS Observational Study and Patient Registry (International)
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
The Effects of Energy Healing in Fibromyalgia
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18–75 · Women only
- 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
Effects of KSM-66 Ashwagandha® (300 mg) on Skin and Hair Health in Healthy Men and Women"
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteers
Neurophysiologic Biomarkers for Cognitive Rehabilitation
VA Office of Research and Development
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–75
- 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
Sensory Adapted Dental Environments to Enhance Oral Care for Children With and Without Dental Fear and Anxiety
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 6–12
- RecruitingHealthy volunteers
Novel Multimodal Neural, Physiological, and Behavioral Sensing and Machine Learning for Mental States
University of Southern California
- Location
- Downey, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Study to Evaluate Community-Based Measures to Increase RSV Vaccine Use Among Latino Adults
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Somatic Dysfunction in Patients With Acute Cerebrovascular Disease
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
An Evaluation of the Pink Cloud Application in Post- Treatment Substance Use Disorder Support
Loyola Marymount University
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Impact of Aerosol Box Use During Cardiopulmonary Arrest: A Multicenter Study
KidSIM Simulation Program
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteers
Motivational Wellness Coaching to Reduce Childhood Obesity in Families and Kids
Kaiser Permanente
- Location
- Pasadena, CA
- Eligibility basics
- Ages 2–8
- RecruitingHealthy volunteers
Immediate Postpartum Glucose Tolerance Testing
MemorialCare Health System
- Location
- Long Beach, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Medial-prefrontal Enhancement During Schizophrenia Systems Imaging
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–64
- RecruitingHealthy volunteers
A Randomized Controlled Trial Testing the Effect of the Youth Mindful Awareness Program on Negative Affect (YMAP2).
Vanderbilt University
- Location
- Los Angeles, CA + 2 other US sites
- Eligibility basics
- Ages 12–17
- RecruitingHealthy volunteers
Temporal Investigation of Multimodal Elements
Buck Institute for Research on Aging
- Location
- Novato, CA
- Eligibility basics
- Ages 55+