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
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+
- RecruitingHealthy volunteers
Effect of Watermelon on Cardiometabolic Health
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Any age listed · Women only
- RecruitingHealthy volunteers
The Effects of Very Brief Exposure on PTSD in U.S. Combat Veterans
Children's Hospital Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteers
PPMI Clinical - Establishing a Deeply Phenotyped PD Cohort
Michael J. Fox Foundation for Parkinson's Research
- Location
- La Jolla, CA + 29 other US sites
- Eligibility basics
- Ages 30+
- RecruitingHealthy volunteersPhase 2/Phase 3
A Study of Potential Disease Modifying Treatments in Individuals at Risk for or With a Type of Early Onset AD Caused by a Genetic Mutation
Washington University School of Medicine
- Location
- La Jolla, CA + 11 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2/Phase 3
A Study of a Potential Disease Modifying Treatment in Individuals at Risk for or With a Type of Early Onset AD Caused by a Genetic Mutation
Washington University School of Medicine
- Location
- La Jolla, CA + 11 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Effect of Daily Mixed Spice Consumption on Memory Function
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 50–80
- RecruitingHealthy volunteers
Social Media Influences on Engagement and Susceptibility to Non-combustible Tobacco Product Use Among Youth and Young Adults (AYA)
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 14–17
- RecruitingHealthy volunteers
Pancreatic Cancer Early Detection Consortium
Arbor Research Collaborative for Health
- Location
- Burbank, CA + 39 other US sites
- Eligibility basics
- Ages 18–90
- RecruitingHealthy volunteers
Tactile Pre-Visit Imagery
University of Southern California
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 4–10
- RecruitingHealthy volunteers
Improving Overactive Bladder Treatment Access and Adherence
Stanford University
- Location
- Redwood City, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Web-based Program to Improve Self-management Among Veterans-caregiver Dyads
VA Office of Research and Development
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
Fimepinostat, Combination HDAC and Pi3-kinase Inhibitor Tumor-Directed Therapy for Cushing Disease
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Deep Functional Phenotyping of the ALA Lung Health Cohort
Johns Hopkins University
- Location
- Los Angeles, CA + 11 other US sites
- Eligibility basics
- Ages 25–35
- RecruitingHealthy volunteers
Effects of Goji vs. Fiber on Macular Degeneration
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 65–95
- RecruitingHealthy volunteers
Comprehensive HHT Outcomes Registry of the United States (CHORUS)
Cure HHT
- Location
- Los Angeles, CA + 15 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Social Media Support Groups for Adolescent Vaping Cessation
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 13+
- RecruitingHealthy volunteers
Social Facilitation of Emotion Regulation in Adolescence
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 13–25
- RecruitingHealthy volunteers
Health-E You Efficacy Trial for Male Adolescents
Johns Hopkins University
- Location
- Oakland, CA + 7 other US sites
- Eligibility basics
- Ages 13–21 · Men only
- RecruitingHealthy volunteers
Sodium in the Skin and Atopic Dermatitis
University of California, San Francisco
- Location
- San Francisco, CA + 1 other US site
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteers
Cultural Adaptation of Drug Treatment for DJJ Youth
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 13–17
- RecruitingHealthy volunteers
Brain/Craving Response to Smoking Cues After Oral Nicotine Pouch Use
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 21–55
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.