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 volunteersPhase 4
Androgen Effects on the Reproductive Neuroendocrine Axis, 2025 Version
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 18–35 · Women only
- RecruitingHealthy volunteersPhase 3
Geriatric Evaluation and Management With Survivorship Health Education for Older Survivors of Cancer, GEM-S Trial
University of Rochester
- Location
- Fremont, CA + 43 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
Understanding the Clinical Pharmacology of Marijuana-Tobacco Co-administration
University of California, San Francisco
- Location
- San Francisco, CA
- Eligibility basics
- Ages 21–65
- RecruitingHealthy volunteers
Effects of White Button Mushroom on Inflammation in Obese Postmenopausal Women at High Risk of Breast Cancer
City of Hope Medical Center
- Location
- Duarte, CA
- Eligibility basics
- Ages 21+ · Women only
- RecruitingHealthy volunteersPhase 2
Randomized Phase II Trial of Targeted Radiation With no Castration for Mcrpc
VA Office of Research and Development
- Location
- West Los Angeles, CA + 3 other US sites
- Eligibility basics
- Ages 18+ · Men only
- RecruitingHealthy volunteers
UCLA Perinatal Biospecimen Repository
Yalda Afshar, MD, PhD
- Location
- Los Angeles, CA
- Eligibility basics
- Any age listed
- RecruitingHealthy volunteers
Towards Restoring Complex Movement After Paralysis: Algorithm Development With Healthy Participants
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Imaging-based Assessment of Oral Biofilm and Gingival Health
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Efficacy of Lavender Aromatherapy on Anxiety and Pain Reduction During Awake Otolaryngologic Procedures
Cedars-Sinai Medical Center
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
BrainWeighve App Feasibility Study
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 14–21
- RecruitingHealthy volunteers
RCT for Latina Mental Health Using Web-Based Apps
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+ · Women only
- RecruitingHealthy volunteers
Effects of Mouthrinse on the Microbiome of the Oral Cavity and GI Tract
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Mindfulness-Based Intervention to Reduce Stress Through the Cultivation of Loving-Kindness, Compassion, Joy, and Equanimity in Healthcare Professionals
University of California, Los Angeles
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Moderators and Mediators of Perceptual Learning
University of Wisconsin, Madison
- Location
- Riverside, CA + 1 other US site
- Eligibility basics
- Ages 18–85
- RecruitingHealthy volunteers
Carotenoids in the Skin and Immune Aging
Stanford University
- Location
- Redwood City, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
A Pilot Study to Evaluate Multi-Spectral and Laser Speckle Imaging and Multiphoton Microscopy During Vascular Occlusion
University of California, Irvine
- Location
- Irvine, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Testing a Gender-inclusive HIV Prevention Program
Center for Innovative Public Health Research
- Location
- San Clemente, CA
- Eligibility basics
- Ages 14–18 · Men only
- RecruitingHealthy volunteers
Effects of PFC tDCS on Cognitive Control, Attention Lapses and Coordinated Neural Activity in the Theta and Alpha Bands
University of California, Davis
- Location
- Sacramento, CA
- Eligibility basics
- Ages 18–50
- RecruitingHealthy volunteersPhase 4
A Trial Comparing Screening Mammography With and Without Assistance From Artificial Intelligence for Breast Cancer Detection and Recall Rates in Adult Patients
Jonsson Comprehensive Cancer Center
- Location
- Los Angeles, CA + 5 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
Effects of Energy Drinks on Cardiovascular Endpoints
University of the Pacific
- Location
- Stockton, CA
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
NIA_Improving Function and Well-being by Improving Patient Memory: Transdiagnostic Sleep and Circadian Treatment
University of California, Berkeley
- Location
- Berkeley, CA
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteers
Target ALS Biomarker Study; Longitudinal Biofluids, Clinical Measures, and At Home Measures
Target ALS Foundation, Inc.
- Location
- San Diego, CA + 9 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Advance Care Planning With Formerly Homeless Older Adults Residing in Permanent Supportive Housing
University of California, San Francisco
- Location
- Fremont, CA + 5 other US sites
- Eligibility basics
- Ages 50+
- RecruitingHealthy volunteersPhase 2
Implementing Food Referrals for Equity and Sustained Health
University of California, San Diego
- Location
- San Diego, CA
- Eligibility basics
- Ages 5+
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.