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
Circulating Biomarkers in the Development of Type 1 Diabetes
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Investigating the Feasibility and Acceptability of an Innovative Interdisciplinary Supportive Care Program: Couples Coping Together Against Cancer
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Sleep TMS for Depression
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Impact of Lactation Antenatal Teaching by Clinicians and Healthcare Providers
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Cognitive and Electrophysiological Assessment of Non-Invasive Temporally-Interfering Electric Fields Stimulation (TIEFS)
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
A Dyadic Sleep Health Approach for Persons With Alzheimer's Disease and Caregivers
University of California, Los Angeles
- Location
- La Jolla, CA + 2 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Dynamic Critical Congenital Heart Screening With Addition of Perfusion Measurements
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Up to age 1 mo
- RecruitingHealthy volunteersPhase 4
Investigation of Locus Coeruleus Function in Sustained Attention
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteers
Childhood Cancer Survivor Study
St. Jude Children's Research Hospital
- Location
- Duarte, CA + 26 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Behavioral Activation and Risk Reduction for Stimulant Use Among Sexually Active Adolescents and Young Adults
Westat
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 16–24
- RecruitingHealthy volunteers
Melanin and Dermal Uptake of Thirdhand Cigarette Smoke
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteers
Measuring Environmental Tobacco and Cannabis: Pollutants and Exposures
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 21–50
- RecruitingHealthy volunteersPhase 4
Computational Assessment of GABA Receptor Modulation in PTSD
VA Office of Research and Development
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 4
Tranexamic Acid for Second Trimester Dilation and Evacuation and Bleeding Outcomes
University of California, San Diego
- Location
- San Diego, CA + 2 other US sites
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Multivitamin and Mineral Supplementation and Healthy Aging
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 40–60
- RecruitingHealthy volunteers
Acoustic and Electrical Stimulation for the Treatment of Tinnitus
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Platelet Expression of FcγRIIa and Arterial Hemodynamics to Predict Recurrent Stroke in Intracranial Atherosclerosis
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 30+
- RecruitingHealthy volunteers
Polyphenols and Cognitive Decline
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteers
Refitting Satisfied INFUSE One-Day Multifocal Wearers to DAILIES TOTAL1 Multifocal Contact Lenses
Gordon Schanzlin New Vision
- Location
- La Jolla, CA
- Eligibility basics
- Ages 40+
- RecruitingHealthy volunteers
Village-Integrated Eye Worker Trial II
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 60+
- RecruitingHealthy volunteers
Building Resilient Families
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 3–11
- RecruitingHealthy volunteersPhase 2/Phase 3
Naltrexone for Overdose Prevention
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Increasing Germline Genetic Testing for Patients With Cancer
Josh Peterson
- Location
- Los Angeles, CA + 9 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Implementation Supports to Reduce Burnout in Therapists Delivering Child Trauma EBPs
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 3–99
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.