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
Targeting Aging With a Ketone Ester for Function in Frailty
Buck Institute for Research on Aging
- Location
- Novato, CA + 2 other US sites
- Eligibility basics
- Ages 65+
- RecruitingHealthy volunteers
Effectiveness of Brief Intervention in Primary Care for Diverse Young People (Chat)
RAND
- Location
- Commerce, CA + 2 other US sites
- Eligibility basics
- Ages 12–19
- RecruitingHealthy volunteersPhase 4
The Impact of Salt Intake on Sodium in the Skin and Inflammatory Skin Disease
University of California, San Francisco
- Location
- San Francisco, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Inflammation, Diabetes, Ethnicity and Obesity Cohort
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteers
Parkinson Progression Marker Initiative Online (PPMI Online)
Michael J. Fox Foundation for Parkinson's Research
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Effects of Dietary Supplements on Muscle Mass and Function While Using GLP-1 Medication
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Engaging Diverse and Underserved Communities in Cancer Awareness Training and Education
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteers
Quality of End-of-Life Care for Children With Cancer
Children's Oncology Group
- Location
- Oakland, CA + 27 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Clinic-wide Intervention (Primary Care-GI Connect) for Improving Rates of Colonoscopy After Abnormal Fecal Immunochemical Test Result in Patients at Federally Qualified Health Centers
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Assessing Brain Metabolism Using MRS With Deuterated Glucose
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Multi-Modality Surveillance Program for Women at High Risk for Breast Cancer
University of Chicago
- Location
- La Jolla, CA + 2 other US sites
- Eligibility basics
- Ages 25+ · Women only
- RecruitingHealthy volunteersPhase 4
Pragmatic Evaluation of Events And Benefits of Lipid-lowering in Older Adults
Duke University
- Location
- Fresno, CA + 88 other US sites
- Eligibility basics
- Ages 75+
- RecruitingHealthy volunteers
Friedreich Ataxia Global Clinical Consortium UNIFIED Natural History Study
Friedreich's Ataxia Research Alliance
- Location
- Los Angeles, CA + 8 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
UCSF Center for Genome Surgery Biobank and Registry
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Pilot Study on In-vivo Non-invasive Skin Imaging Using Multiphoton Microscopy
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Intracranial Neurophysiological Signatures of Fear and Anxiety in Humans
Duke University
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteers
Shoulder Strength in Baseball Players
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 15–22
- RecruitingHealthy volunteers
Effects of Watermelon or Low-fat Cookie Consumption on Wellness
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteersPhase 3
Digital Health Intervention for Self-Management and Telemonitoring in Chimeric Antigen Receptor (CAR-T) Therapy
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Diet Quality Pilot Intervention in LA Safety Net
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
The HOPE Biobank Resource (BMT CTN 2402 HOPE)
Medical College of Wisconsin
- Location
- Duarte, CA + 13 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
The SEQUENCE Trial
Northwestern University
- Location
- Sacramento, CA + 4 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Enhancing Attention and Wellbeing Using Digital Therapeutics
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 60–99
- RecruitingHealthy volunteers
ASSESS ALL ALS Study
St. Joseph's Hospital and Medical Center, Phoenix
- Location
- Irvine, CA + 35 other US sites
- 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.