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
Effects of White Button Mushroom on Inflammation in Obese Postmenopausal Women at High Risk of Breast Cancer
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 21+ · Women only
- RecruitingHealthy volunteersPhase 2
Randomized Phase II Trial of Targeted Radiation With no Castration for Mcrpc
VA Office of Research and Development
- Location
- West Los Angeles, CA + 3 other US sites
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
UCLA Perinatal Biospecimen Repository
Yalda Afshar, MD, PhD
- Location
- Los Angeles, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Towards Restoring Complex Movement After Paralysis: Algorithm Development With Healthy Participants
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Imaging-based Assessment of Oral Biofilm and Gingival Health
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Efficacy of Lavender Aromatherapy on Anxiety and Pain Reduction During Awake Otolaryngologic Procedures
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
BrainWeighve App Feasibility Study
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 14–21
- RecruitingHealthy volunteers
RCT for Latina Mental Health Using Web-Based Apps
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Effects of Mouthrinse on the Microbiome of the Oral Cavity and GI Tract
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Mindfulness-Based Intervention to Reduce Stress Through the Cultivation of Loving-Kindness, Compassion, Joy, and Equanimity in Healthcare Professionals
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Moderators and Mediators of Perceptual Learning
University of Wisconsin, Madison
- Location
- Riverside, CA + 1 other US site
- Eligibility basics
- Ages 18–85
- RecruitingHealthy volunteers
Carotenoids in the Skin and Immune Aging
Stanford University
- Location
- Redwood City, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Pilot Study to Evaluate Multi-Spectral and Laser Speckle Imaging and Multiphoton Microscopy During Vascular Occlusion
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Testing a Gender-inclusive HIV Prevention Program
Center for Innovative Public Health Research
- Location
- San Clemente, CA
- Eligibility basics
- Ages 14–18 · Men only
- RecruitingHealthy volunteers
Effects of PFC tDCS on Cognitive Control, Attention Lapses and Coordinated Neural Activity in the Theta and Alpha Bands
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteersPhase 4
A Trial Comparing Screening Mammography With and Without Assistance From Artificial Intelligence for Breast Cancer Detection and Recall Rates in Adult Patients
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA + 5 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
Effects of Energy Drinks on Cardiovascular Endpoints
University of the Pacific
- Location
- Stockton, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
NIA_Improving Function and Well-being by Improving Patient Memory: Transdiagnostic Sleep and Circadian Treatment
University of California, Berkeley
- Location
- Berkeley, CA
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteers
Target ALS Biomarker Study; Longitudinal Biofluids, Clinical Measures, and At Home Measures
Target ALS Foundation, Inc.
- Location
- San Diego, CA + 9 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Advance Care Planning With Formerly Homeless Older Adults Residing in Permanent Supportive Housing
University of California, San Francisco
- Location
- Fremont, CA + 5 other US sites
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteersPhase 2
Implementing Food Referrals for Equity and Sustained Health
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 5+
- RecruitingHealthy volunteers
Improving Colonoscopy Surveillance for Patients With High Risk Colon Polyps
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 21+
- RecruitingHealthy volunteers
Language Control Across Modalities
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Utilizing Advocates and Supporters to Increase Lung Cancer Screening Rates in Eligible Participants
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 40–80