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
Bedside Ultrasound of Gastric Contents in Pediatric Populations
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 2–60
- RecruitingHealthy volunteersPhase 3
Food Prescriptions to Promote Affordable Diets
Kaiser Permanente
- Location
- Pasadena, CA
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
Vaccine Confidence and Infodemic in Southeast Asia's Nusantara Sociocultural Sphere
University of California, Berkeley
- Location
- Berkeley, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Diagnosing Obstructive Sleep Apnea Using Electromyography of the Muscles of the Mouth
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Huntington's Disease Biobank: Advancing Remote Monitoring and Deep Phenotyping
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Clinical Translation of a Novel Brain PET Insert for Simultaneous PET/MR
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 21+
- RecruitingHealthy volunteers
Multi-Omics for Maternal Health After Preeclampsia
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–50 · Women only
- RecruitingHealthy volunteers
Microbiome Sampling During Endurance Exercise
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Babies' Brain Responses to Strangers
University of California Santa Cruz
- Location
- Santa Cruz, CA
- Eligibility basics
- Ages 7 mo–1
- RecruitingHealthy volunteers
TREAT-BE Study (Treatment With Resection and Endoscopic Ablation Techniques for Barrett's Esophagus)
University of Colorado, Denver
- Location
- Los Angeles, CA + 3 other US sites
- Eligibility basics
- Ages 18–100
- RecruitingHealthy volunteers
Smoke-free Home Study in Subsidized Housing
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 3
Comparative Effectiveness of MRgFUS Versus CTgRFA for Osteoid Osteomas
Matthew Bucknor
- Location
- Palo Alto, CA + 2 other US sites
- Eligibility basics
- Ages 8+
- RecruitingHealthy volunteers
Researchers At UC San Diego Are Learning About the Benefits of Human Milk and How It Influences Infant and Child Health
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Clinical Validation of the Role of microRNA Binding Site Mutations in Cancer Risk, Prevention and Treatment
MiraKind
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The Healthy Elderly Longevity Cohort
Scripps Translational Science Institute
- Location
- La Jolla, CA
- Eligibility basics
- Ages 80+
- RecruitingHealthy volunteers
CYP2C19 Variants and Limonene Metabolism
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Improving Psychological and Vestibular Health: MINDGAPS
University of Montana
- Location
- San Diego, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Role of Nutrient Transit in Hyperinsulinemic Hypoglycemia
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Longitudinal Multi-Omic Profiles to Reveal Mechanisms of Obesity-Mediated Insulin Resistance
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 35–65
- RecruitingHealthy volunteers
Obesity, Insulin Resistance, and PASC: Persistent SARS-CoV-2
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 2
Tirzepatide: Reversal of Lipotoxicity and Adipose Tissue Dysfunction in Humans With Overweight/Obesity
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteers
Beneficial Exposome Study
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Efficacy and Safety of a Proprietary Blend of Ashwagandha Root Extract (Aqueous) in Adult Men and Women With High Stress and Anxiety: A Randomized, Double-blind, Three-arm, Parallel, Placebo-controlled Study
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Efficacy and Safety of Shatavari for Treatment of Menopausal Symptoms in Women: A Randomized, Double-blind, Three-arm, Parallel, Placebo-controlled Study
SF Research Institute, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 45–55 · Women 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.