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
Social Facilitation of Alcohol Effects and Alcohol Misuse in Young Adults
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 21–28
- RecruitingHealthy volunteers
The K-Map Study, Global Prevalence of KC
University Hospital, Geneva
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 6–23
- RecruitingHealthy volunteers
HEPA, PM2.5, and Cardiometabolic Health
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 65–84
- RecruitingHealthy volunteers
EyeConic: Qualification for Cone-Optogenetics
Institute of Molecular and Clinical Ophthalmology Basel
- Location
- San Francisco, CA + 2 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Specialty Compared to Oncology Delivered Palliative Care for Patients With Acute Myeloid Leukemia
Massachusetts General Hospital
- Location
- Stanford, CA + 19 other US sites
- Eligibility basics
- Ages 18–120
- RecruitingHealthy volunteers
Validating Gulf War Illness Blood Biomarkers
Roskamp Institute Inc.
- Location
- Palo Alto, CA + 2 other US sites
- Eligibility basics
- Ages 35+
- RecruitingHealthy volunteers
Analysis of Headache Chronification With Imaging, Deep Phenotyping, and Proteomics
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Alzheimer Prevention Trials (APT) Webstudy
University of Southern California
- Location
- San Diego, CA
- Eligibility basics
- Ages 50–85
- RecruitingHealthy volunteers
Comparison of Methods for Recording Post Operative Pain
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Ketone Monoester Supplements, High Altitude, and Brain Blood Flow During Exercise
McMaster University
- Location
- Bishop, CA
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Encoding Temporal Fine Structure for Cochlear Implants
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
TrialNet Pathway to Prevention of T1D
University of South Florida
- Location
- Orange, CA + 16 other US sites
- Eligibility basics
- Ages 2–45
- RecruitingHealthy volunteers
eMOTION: Examining Affective Mechanisms in Physical Activity Engagement
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Hair Biomarkers Study
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 6 mo–2
- RecruitingHealthy volunteers
Characterization of Inclusion Body Myopathy Associated With Paget's Disease of Bone and Frontotemporal Dementia (IBMPFD)
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The Family Perspectives Project Pilot Trial
Matthew Modes
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Empathy Through Pain Control: Lidocaine Paracervical Block for IUD Placements
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18–50 · Women only
- RecruitingHealthy volunteers
Demonstrating the Efficacy of a Spanish-Language Program for Latino Dementia Caregivers
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–100
- RecruitingHealthy volunteersPhase 2
Valacyclovir in Pain Management of Acute Apical Abscesses
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Brown Adipose Tissue Activity in Response to Semaglutide Administered to Obese Subjects.
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Family, Responsibility, Education, Support, and Health for Food Responsiveness
University of California, San Diego
- Location
- La Jolla, CA + 1 other US site
- Eligibility basics
- Ages 7–12
- RecruitingHealthy volunteers
Bedside Ultrasound of Gastric Contents in Pediatric Populations
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 2–60
- RecruitingHealthy volunteersPhase 3
Food Prescriptions to Promote Affordable Diets
Kaiser Permanente
- Location
- Pasadena, CA
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
Vaccine Confidence and Infodemic in Southeast Asia's Nusantara Sociocultural Sphere
University of California, Berkeley
- Location
- Berkeley, CA
- Eligibility basics
- Ages 18+