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
Neural Correlates of Real World Spatial Navigation in Humans
Duke University
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 18–90
- RecruitingHealthy volunteers
Pancreatic Cancer Detection Consortium
City of Hope Medical Center
- Location
- Monrovia, CA + 8 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 3
Screening for Prostate Cancer Using High Resolution Micro-ultrasound Versus Multiparametric Magnetic Resonance Imaging.
University of Alberta
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 50–70 · Men only
- RecruitingHealthy volunteers
GBPDC: Gut-Brain in PD Consortium Master Protocol
Duke University
- Location
- Stanford, CA + 3 other US sites
- Eligibility basics
- Ages 21–80
- RecruitingHealthy volunteers
Latinx Children and Surgery
University of California, Irvine
- Location
- Orange, CA
- Eligibility basics
- Ages 2–12
- RecruitingHealthy volunteers
Comparison of Microbiome Changes in Healthy Adults Following Ketone Ester Consumption
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
American Lung Association (ALA) Lung Health Cohort
Johns Hopkins University
- Location
- Los Angeles, CA + 26 other US sites
- Eligibility basics
- Ages 25–35
- RecruitingHealthy volunteers
UCLA REST Study (REsearch on Sleep Techniques)
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18–22
- RecruitingHealthy volunteers
CHOICE to AVOID or RESIST
Cedars-Sinai Medical Center
- Location
- Beverly Hills, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Predicting Pre-dementia
Prevention Research Consortium Corp.
- Location
- San Diego, CA
- Eligibility basics
- Ages 55+
- RecruitingHealthy volunteers
Supporting Just-In-Time Consent for Prenatal Screening: The INFORM Study
Case Western Reserve University
- Location
- San Francisco, CA + 2 other US sites
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteersPhase 4
Ancillary Nocturnal Urinary Symptoms Analyses for TRIUMPH
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 60+ · Women only
- RecruitingHealthy volunteers
Women Informed to Screen Depending on Measures of Risk (Wisdom Study)
University of California, San Francisco
- Location
- Irvine, CA + 8 other US sites
- Eligibility basics
- Ages 30–74 · Women only
- RecruitingHealthy volunteersPhase 3
Cessation or Reduction of Alcohol Consumption in Veterans: A Randomized Controlled Trial for Alcohol Use Disorder (CRAVE)
VA Office of Research and Development
- Location
- Long Beach, CA + 17 other US sites
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 3
Delaying the Onset of Nearsightedness Until Treatment (DONUT) Clinical Trial
Ohio State University
- Location
- Berkeley, CA + 11 other US sites
- Eligibility basics
- Ages 6–11
- RecruitingHealthy volunteersPhase 2/Phase 3
Milk Volume Outcomes Following Oral Nicotinamide Riboside Supplementation in Mothers of Extremely Preterm Infants
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Pregnancy and Postpartum Breastfeeding Support for Patients With Gestational Diabetes
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Lung and Heart Function Across Decades of Life in Health
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 24–68
- RecruitingHealthy volunteers
Near Infrared Spectroscopy (NIRS) for Assessment of Depression
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Impact of Peanut Consumption on Stress, Immune Function, Inflammation, and Cardiovascular Health in High-Stress Individuals
USDA, Western Human Nutrition Research Center
- Location
- Davis, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Telehealth Self-Management Coaching Sessions to Improve Quality of Life in Pancreatic Cancer Survivors and Their Family Care Givers
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Medical Residents Learning Weight Management Counseling Skills
University of Massachusetts, Worcester
- Location
- Palo Alto, CA + 6 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Trauma-Informed Care for Smoking Cessation for Pregnancy
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteersPhase 4
The Impact of Dietary Salt on the Severity of Eczema
University of California, San Francisco
- Location
- San Francisco, CA + 1 other US site
- 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.