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
fNIRS for Disorders of Consciousness
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
Hyperpolarized Carbon Metabolic Imaging in Multiple Sclerosis
Ari Green
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Retinal Imaging in Patients With Inherited Retinal Degenerations
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 13+
- RecruitingHealthy volunteers
Lung Macrophage Populations and Functions in Chronic Obstructive Pulmonary Disease (COPD)-Susceptible Smokers
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 40–75
- RecruitingHealthy volunteersPhase 2
Investigating the Use of Intravenous Tranexamic Acid in Gender Affirming Mastectomy
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteersPhase 4
Immune Spatial Features of Guselkumab Cutaneous Response
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The Society for Obstetric Anesthesia and Perinatology Research Network General Anesthesia Registry
Yale University
- Location
- San Francisco, CA + 32 other US sites
- Eligibility basics
- Ages 15–55 · Women only
- RecruitingHealthy volunteers
Analysis of Lumbar Spine Stenosis Specimens for Identification of Transthyretin Cardiac Amyloidosis
Columbia University
- Location
- Beverly Hills, CA + 4 other US sites
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteersPhase 2
Investigating the Interaction of Psilocybin and Context of Its Administration in Healthy Volunteers
Robin Carhart-Harris, PhD, MA
- Location
- San Francisco, CA
- Eligibility basics
- Ages 21–70
- RecruitingHealthy volunteers
Healthy Family Project: Tobacco Use and Smoke Exposure in Asian American Communities
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
SPIROMICS Study of Early COPD Progression (SOURCE)
University of Massachusetts, Worcester
- Location
- Los Angeles, CA + 13 other US sites
- Eligibility basics
- Ages 30–55
- RecruitingHealthy volunteers
Multisite Implementation of COMPRENDO
University of California, San Diego
- Location
- San Diego, CA + 3 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
Glutide for Ending Methamphetamine
San Francisco Department of Public Health
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 4
Vancomycin in TKAs
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Effect of Gerofit Exercise on Cognition in Older Veterans
VA Office of Research and Development
- Location
- West Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteers
Breast Cancer Screening Adherence for Women at Moderate Risk for Breast Cancer
University of Southern California
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 30–75 · Women only
- RecruitingHealthy volunteers
Effectiveness of Cognitive Training in Older and Younger Adults
University of Wisconsin, Madison
- Location
- Riverside, CA + 2 other US sites
- Eligibility basics
- Ages 18–85
- RecruitingHealthy volunteers
The INSPIRE -Faith Study: Intervention Strategies for Preserving Intellectual Resilience and Engagement
Healthy Minds Initiative
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 55–85
- RecruitingHealthy volunteers
Comparing Two School-Based Sleep Health Interventions To Promote Sleep Quality in Youth
Children's Hospital Los Angeles
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 12–18
- RecruitingHealthy volunteers
Online Pivotal Response Treatment Training in Autism Spectrum Disorder
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 2–5
- RecruitingHealthy volunteers
Tumor Genomics, Individual Risk Factors, and External Drivers of Health on Health Outcomes for Patients With Meningioma
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Milk-Tot Study: Impact of Whole Versus Low-fat Milk on Child Health
University of California, Davis
- Location
- Oakland, CA
- Eligibility basics
- Ages 1–4
- RecruitingHealthy volunteers
Blood Flow Restriction Training as a Targeted Intervention for Rowers With Back Pain.
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 13–20
- RecruitingHealthy volunteers
Prostate Cancer Screening for People at Genetic Risk for Aggressive Disease, PATROL Study
University of Washington
- Location
- Duarte, CA + 6 other US sites
- Eligibility basics
- Ages 40+ · Men only
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.