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
Sexual Health Advocacy for Guys - a Text Messaging-based HIV Prevention Program for Guys Who Are Into Guys
Center for Innovative Public Health Research
- Location
- San Clemente, CA
- Eligibility basics
- Ages 13–22 · Men only
- RecruitingHealthy volunteers
Abuse Liability and Appeal of Oral Nicotine Products
University of Southern California
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 21–25
- RecruitingHealthy volunteers
Improving Behavioral Health for Caregivers and Children After Pediatric Injury
Medical University of South Carolina
- Location
- Los Angeles, CA + 3 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Evaluation of Geriatric Assessment and Management for Older Adults With Non-small Cell Lung Cancer Receiving Chemotherapy Radiation Therapy
City of Hope Medical Center
- Location
- Duarte, CA + 1 other US site
- Eligibility basics
- Ages 60+
- RecruitingHealthy volunteers
Brain Health in Breast Cancer Survivors
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 35–65 · Women only
- RecruitingHealthy volunteers
Early Onset Colorectal Cancer Detection
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteers
Early Detection of Advanced Adenomas and Colorectal Cancer
City of Hope Medical Center
- Location
- Monrovia, CA + 1 other US site
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Noninvasive and Screening miRNA Signature for Gastrointestinal Cancer
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Liquid Biopsy for Early Detection of Colorectal Cancer Using Circular RNA
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Integrated Cf-miRNA and Exosomal miRNA Signature for Early Detection of Esophageal Squamous Cell Carcinoma
City of Hope Medical Center
- Location
- Monrovia, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
PEP/PrEP Via Pharmacist-Prescribing Implementation (PEPPI)
EMPOWERX INC
- Location
- Del Mar, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Immunomodulatory Effects of Fasting in Healthy Adults
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 20–40
- RecruitingHealthy volunteers
Gender Disparities in Voice Outcomes After Tracheoesophageal Puncture in Total Laryngectomy Patients (UC Davis)
University of California, Davis
- Location
- La Jolla, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Magnetic Resonance Imaging of Breast Cancer
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 21+ · Women only
- RecruitingHealthy volunteers
Project for Multi-Omics-Based Early Detection of Hepatocellular Carcinoma (PROMETHEA Study)
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Blossom® Smart Expander Device for Tissue Expander/Implant-Based Breast Reconstruction
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Molecular Genetics Studies of Cancer Patients and Their Relatives
City of Hope Medical Center
- Location
- Concord, CA + 33 other US sites
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
The Actuate-CBC Study
University of Pennsylvania
- Location
- Orange, CA + 2 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Developing a Nutritional Supplement to Increase Collagen Synthesis in People
University of California, Davis
- Location
- Davis, CA
- Eligibility basics
- Ages 18–30
- RecruitingHealthy volunteers
Practice Facilitation as a Strategy to Improve Alcohol Treatment Adoption and Implementation in HIV Care
Johns Hopkins University
- Location
- San Diego, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Early Introduction and Sustained Ingestion (EISI) Using Two Educational Opportunities in Infants
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 4 mo–11 mo
- RecruitingHealthy volunteers
Modified Pivotal Response Treatment for Insistence on Sameness in Autistic Youth
Stanford University
- Location
- Stanford, CA
- Eligibility basics
- Ages 4–17
- RecruitingHealthy volunteers
Better Breaks: Strength Breaks vs Walk Breaks for Sedentary Behavior Breaks
Stanford University
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 30+
- RecruitingHealthy volunteers
Teen Helpline Motivational Interviewing Study
San Diego State University
- Location
- San Diego, CA
- Eligibility basics
- Ages 13+
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.