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
A Multicenter Prospective Observational Cohort Study Evaluating the Impact of Cancer-Directed Treatment and Medication Use, Including Cannabis Use, in Multiple Myeloma Patients
City of Hope Medical Center
- Location
- Duarte, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Chardonnay Marc and Vascular Response
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 30–50 · Men only
- RecruitingHealthy volunteers
Vaginal Changes After CO2 Laser
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteersPhase 4
Prevention of Postop Atrial Fibrillation Through Intraoperative Inducibility of Atrial Fibrillation and Amiodarone Treatment
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
Fiber and Calcium Absorption in Older Men
VA Office of Research and Development
- Location
- San Francisco, CA
- Eligibility basics
- Ages 60+ · Men only
- RecruitingHealthy volunteers
The Effect of Intraoral Transcutaneous Electrical Nerve Stimulation in Orthodontics Pain
University of the Pacific
- Location
- San Francisco, CA
- Eligibility basics
- Ages 12+
- 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
Spectroscopic Evaluation of Middle Ear Infection
University of California, Irvine
- Location
- Orange, CA + 1 other US site
- Eligibility basics
- Up to age 21
- RecruitingHealthy volunteers
Testing the Effectiveness of an Intervention That Aligns Circadian Rhythm With Daily Activities on Student Flourishing
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Novel Serum Markers for Monitoring Response to Anti-Cancer Therapy
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The Influence of Honey-flavored Yogurt on Low-grade Inflammation and Gut Health in Middle to Older Aged Women.
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–65 · Women only
- RecruitingHealthy volunteers
Comparing Clinical Outcomes of Suture Button Versus Fibulink Fixation for Acute Ankle Syndesmosis Injuries
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+
- 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
Proactive Costs of Care Study
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Optimizing Brain Excitability in Depression
Stanford University
- Location
- Iowa City, CA + 1 other US site
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Effects of Daily Beef Intake, as a Component of a Heart-Healthy Diet on Cellular Zinc
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 55–70
- RecruitingHealthy volunteers
Retrograde Femoral Nail-Advanced Outcomes for Fixation of Distal Femur and Femoral Shaft Fractures
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Resilience Programming for Occupational Therapy Students
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
North American Mitochondrial Disease Consortium Patient Registry and Biorepository (NAMDC)
Columbia University
- Location
- San Diego, CA + 15 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteersPhase 4
Efficacy of Preoperative Administration of Gabapentin in 3rd Molar Dental Extraction.
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–59
- RecruitingHealthy volunteers
A Study of a Dietary Supplement on Serum Biomarkers in Children
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 4–15
- RecruitingHealthy volunteers
Isolating and Mitigating Sequentially Dependent Perceptual Errors in Clinical Visual Search
University of California, Berkeley
- Location
- Berkeley, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Beat Childhood Cancer Specimen Banking and Data Registry
Giselle Sholler
- Location
- San Diego, CA + 16 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Filipino Family Health Initiative 1.0
Kaiser Permanente
- Location
- Pasadena, CA
- Eligibility basics
- Ages 8+