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
Pharmacokinetics, Pharmacodynamics, and Safety Profile of Understudied Drugs Administered to Children Per Standard of Care (POPS)
Duke University
- Location
- Palo Alto, CA + 3 other US sites
- Eligibility basics
- Ages 0 mo–20
- RecruitingHealthy volunteers
Measurement and Determinants of Diet Quality in Older Adults
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 60+
- RecruitingHealthy volunteers
Limited Ankle Dorsiflexion and Effect on Single Limb Squats in Individuals With Patellofemoral Pain
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–59 · Women only
- RecruitingHealthy volunteers
Caring for Dementia Caregivers in Ethnic Immigrant Communities
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
Pimavanserin vs. Quetiapine for Treatment of Parkinson's Psychosis
VA Office of Research and Development
- Location
- Loma Linda, CA + 8 other US sites
- Eligibility basics
- Ages 40+
- RecruitingHealthy volunteers
Evidence-Based Quality Improvement to Reduce VA Primary Care Burnout
VA Greater Los Angeles Healthcare System
- Location
- Los Angeles, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Behavioral Safety and Fentanyl Education: BSAFE
San Francisco Department of Public Health
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Validation of Biomarkers for Long COVID in the LIINC Viral Immunopathogenesis and Persistence Repeat Donor Cohort (VIPER)
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Aromatherapy and Its Impact on Preoperative Anxiety, Postoperative Pain, and Patient Experience
Kaiser Permanente
- Location
- Stockton, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
Senicapoc in Alzheimer's Disease
University of California, Davis
- Location
- Sacramento, CA + 1 other US site
- Eligibility basics
- Ages 55–85
- RecruitingHealthy volunteers
Establishing Normal Cognitive Test Scores for Adults Using a Voice-Enabled Digital Testing Platform Across the Lifespan
The Neurology Center of Southern California
- Location
- Carlsbad, CA
- Eligibility basics
- Ages 18–100
- RecruitingHealthy volunteers
Evaluating the Impact of CONNECT in a Multilingual Population
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 50–80
- RecruitingHealthy volunteers
Sauna for Offline Connections and Interactive, Authentic Living
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 19–25
- RecruitingHealthy volunteers
Irritable Bowel Syndrome and Control Volunteers: Diet Challenge
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteers
Body Clocks - Coordination of Peripheral and Central Oscillators
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–30 · Women only
- RecruitingHealthy volunteers
Interventions in Mathematics and Cognitive Skills
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 6–12
- RecruitingHealthy volunteers
HPV Ends Here: Increasing Uptake of the HPV Vaccine
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 10–12
- RecruitingHealthy volunteers
Pregnancy Registry, Infants, Serum/Milk Analysis (PRISMA)
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–64 · Women only
- RecruitingHealthy volunteers
Inter-Brain Synchrony in Schizophrenia
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
The Influence of Chardonnay Marc Intake on Gut and Cardiometabolic Health
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–70 · Women only
- RecruitingHealthy volunteersPhase 2
Mindfulness-Assisted Psychedelic Therapy
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 25+
- RecruitingHealthy volunteers
Fluad vs. Fluzone High-Dose Vaccine Effectiveness Among Adults ≥65 Years
Kaiser Permanente
- Location
- Oakland, CA
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteers
Effects of Hypoxic Breathwork
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Natural History Study of and Genetic Modifiers in Spinocerebellar Ataxias
Lauren Moore
- Location
- Los Angeles, CA + 13 other US sites
- Eligibility basics
- Ages 6+