Healthy volunteers · California
Studies for healthy volunteers in California
701 studies have at least one recruiting site in California. These studies say in their official record that they accept healthy volunteers. Many are Phase 1 studies that test how a new medicine is absorbed and tolerated; others recruit healthy people as a comparison group alongside patients.
701 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
More recruiting studies (pay not posted)
- 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+
- RecruitingHealthy volunteers
Mango Intake and Gut and Cardiometabolic Health in Hispanic/Latino Adolescents
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 12–19
- RecruitingHealthy volunteers
Montalcino Aortic Consortium: Precision Medicine for Heritable Thoracic Aortic Disease
The University of Texas Health Science Center, Houston
- Location
- Newport Beach, CA + 12 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Effects of Mango or Low-Fat Cookie Consumption on Gut Health, and Its Relationship With Mental, Sexual and Skin Health
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteers
Role of Transposable Elements in Septic Immune Aging
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Defense and Veterans Center for Integrative Pain Management (DVCIPM) Pain Registry Biobank
Defense and Veterans Center for Integrative Pain Management
- Location
- San Diego, CA + 1 other US site
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Pilot Trial of Fetoscopic Endoluminal Tracheal Occlusion (FETO) in Severe Left Congenital Diaphragmatic Hernia (CDH)
Hanmin Lee
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Behavioral Weight Loss Intervention Utilizing Mobile Health Technology in Hematopoietic Stem Cell Transplant Patients
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 13–30
- RecruitingHealthy volunteers
Efficacy of Repeated Low-level Red-light Therapy in Myopia Control
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 8–13
- RecruitingHealthy volunteers
Effects of Sabroxy® Supplementation on Insulin Resistance and Cognitive Function in Adults With Mild Cognitive Impairment and Insulin Resistance
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 40–80
- RecruitingHealthy volunteers
Patient-centered Information on Permanent Contraception
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 21–45 · Women only
- RecruitingHealthy volunteersPhase 3
Biomarker Exploration in Aging, Cognition and Neurodegeneration
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 60+
- RecruitingHealthy volunteers
Wavefront-guided LASIK Surgery Compared to Ray Tracing-Guided LASIK Surgery
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 22–59
- RecruitingHealthy volunteers
Effects of Mixed Nut Consumption on Satiety and Weight Management
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteers
Effects of Watermelon Juice on Heart Rate Recovery and Post-exercise Muscle Soreness
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 21–50
- RecruitingHealthy volunteers
Effects of Fresh Watermelon Consumption on Satiety and Cardiometabolic Health
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteers
Effects of Snack Types on Acute Glucose and Insulin Response
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteers
Effects of Fresh Mango Pulp Consumption on Satiety and Cardiometabolic Health
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteers
Effects of Watermelon Consumption on Satiety and Digestive Health
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 10–55
- RecruitingHealthy volunteersPhase 2
This Study is Assessing the Safety and Efficacy of Immune Inhibition as a Treatment to Prevent Primary Graft Dysfunction
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
@neurIST : Intregrated Biomedical Informatics for the Management of Cerebral Aneurysms
University Hospital, Geneva
- Location
- San Francisco, CA + 2 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Cerebral Autosomal Dominant Arteriopathy With Subcortical Infarcts and Leukoencephalopathy (CADASIL) Study
University of Wisconsin, Madison
- Location
- Los Angeles, CA + 9 other US sites
- Eligibility basics
- Ages 18+
Who these studies look for
“Healthy” is decided at screening, not by you. Sites usually check vital signs, blood and urine tests, an ECG, your medications and sometimes your BMI or smoking status. A study can still turn you away for reasons that have nothing to do with being unwell, such as timing or a full roster.
Matching a page like this one never means you qualify. Each research team decides eligibility at screening.
Questions
Do healthy volunteer studies pay?
Many do, because volunteers give up time and follow strict schedules, but amounts are set by each study and are usually only confirmed by the research site. When a record states an amount we show the exact wording; otherwise we say compensation is not disclosed.
What happens at a screening visit?
Expect consent paperwork first, then a health questionnaire, vital signs, blood and urine samples and often an ECG. You can ask questions and withdraw at any time, before or after you sign.