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
Health Properties of Pecan Nut Consumption
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–75
- RecruitingHealthy volunteers
An 8-Week Study Evaluating Gut and Digestive Health After Use of a Dietary Supplement System
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Zinc and Iron Absorption From Common Beans in Young Adult Women
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 19–24 · Women only
- RecruitingHealthy volunteers
A Multicenter Prospective Observational Cohort Study Evaluating the Impact of Cancer-Directed Treatment and Medication Use, Including Cannabis Use, in Multiple Myeloma Patients
City of Hope Medical Center
- Location
- Duarte, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Chardonnay Marc and Vascular Response
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 30–50 · Men only
- RecruitingHealthy volunteers
Vaginal Changes After CO2 Laser
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteersPhase 4
Prevention of Postop Atrial Fibrillation Through Intraoperative Inducibility of Atrial Fibrillation and Amiodarone Treatment
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
Fiber and Calcium Absorption in Older Men
VA Office of Research and Development
- Location
- San Francisco, CA
- Eligibility basics
- Ages 60+ · Men only
- RecruitingHealthy volunteers
The Effect of Intraoral Transcutaneous Electrical Nerve Stimulation in Orthodontics Pain
University of the Pacific
- Location
- San Francisco, CA
- Eligibility basics
- Ages 12+
- RecruitingHealthy volunteers
The ROAR Study: Reactive Oxygen Species and Reproduction
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–43
- RecruitingHealthy volunteers
Spectroscopic Evaluation of Middle Ear Infection
University of California, Irvine
- Location
- Orange, CA + 1 other US site
- Eligibility basics
- Up to age 21
- RecruitingHealthy volunteers
Testing the Effectiveness of an Intervention That Aligns Circadian Rhythm With Daily Activities on Student Flourishing
University of California, San Diego
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Novel Serum Markers for Monitoring Response to Anti-Cancer Therapy
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The Influence of Honey-flavored Yogurt on Low-grade Inflammation and Gut Health in Middle to Older Aged Women.
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 45–65 · Women only
- RecruitingHealthy volunteers
Comparing Clinical Outcomes of Suture Button Versus Fibulink Fixation for Acute Ankle Syndesmosis Injuries
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
BSGM to Evaluate Patients With GI Symptoms
Children's Hospital of Philadelphia
- Location
- San Diego, CA + 4 other US sites
- Eligibility basics
- Ages 8–25
- RecruitingHealthy volunteers
Proactive Costs of Care Study
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Optimizing Brain Excitability in Depression
Stanford University
- Location
- Iowa City, CA + 1 other US site
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Effects of Daily Beef Intake, as a Component of a Heart-Healthy Diet on Cellular Zinc
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 55–70
- RecruitingHealthy volunteers
Retrograde Femoral Nail-Advanced Outcomes for Fixation of Distal Femur and Femoral Shaft Fractures
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Resilience Programming for Occupational Therapy Students
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
North American Mitochondrial Disease Consortium Patient Registry and Biorepository (NAMDC)
Columbia University
- Location
- San Diego, CA + 15 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteersPhase 4
Efficacy of Preoperative Administration of Gabapentin in 3rd Molar Dental Extraction.
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–59
- RecruitingHealthy volunteers
A Study of a Dietary Supplement on Serum Biomarkers in Children
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 4–15
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.