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
A Study Evaluating the Impact of Regular FODMAP-targeting Digestive Enzyme Blend Use on Gastrointestinal Symptoms in Individuals With Self-Reported Bloating
Kiwi Health Inc
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 2
A Study to Learn About mRNA Vaccines Against Influenza in Adults
Pfizer
- Location
- Walnut Creek, CA + 14 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Acellular Dermal Matrix Investigation in Breast Reconstruction
RTI Surgical
- Location
- Duarte, CA + 11 other US sites
- Eligibility basics
- Ages 22+ · Women only
- RecruitingHealthy volunteers
Generative AI Plan for Care Lab Study
Fitbit LLC
- Location
- Mountain View, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 4
Comparing Sarecycline and Doxycycline Effects on the Skin and Gut Bacteria in Acne.
Integrative Skin Science and Research
- Location
- Sacramento, CA
- Eligibility basics
- Ages 9+
- RecruitingHealthy volunteers
Safety and Effectiveness Evaluation of the High-intensity Focused Ultrasound Device for Lifting Lax Submental and Neck Tissue
CLASSYS Inc.
- Location
- Los Angeles, CA + 4 other US sites
- Eligibility basics
- Ages 30–65
- RecruitingHealthy volunteersPhase 3
A Study to Evaluate Tradipitant on Treating Nausea and Vomiting Induced by GLP-1R Agonist Use
Vanda Pharmaceuticals
- Location
- Los Angeles, CA + 2 other US sites
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Examining Olive Oil Extract on Knee Comfort and Function
Applied Food Sciences Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 40–75
- RecruitingHealthy volunteers
Effera Dose Response: Women's Health
Helaina Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–40 · Women only
- RecruitingHealthy volunteers
Decentralized Study to Evaluate a Dietary Supplement for Episodes of Mild Acute Stress in Healthy People
PLT Health Solutions
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–60
- RecruitingHealthy volunteers
Immune Defense Protein Impact On Respiratory Immune Outcomes
Quantec Ltd
- Location
- Los Angeles, CA
- Eligibility basics
- Ages 60+
- RecruitingHealthy volunteers
Autologous Hair Follicle Derived Secretome as Adjunct to Aesthetic Procedures
Acorn Biolabs Inc.
- Location
- Fresno, CA + 18 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Data Gathering for A10900
Optos, PLC
- Location
- Anaheim, CA + 2 other US sites
- Eligibility basics
- Ages 22+
- RecruitingHealthy volunteers
Autologous Hair Follicle Secretome for Androgenic Alopecia (Single Site)
Acorn Biolabs Inc.
- Location
- West Hollywood, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Evaluation of Gut-Related Well-Being and Mood Effects of a Daily Nutritional Food Ingredient From the Co-Fermentation of Fungal Mycelium (Pleurotus Pulmonarius) and Microalgae (Chlorella Vulgaris)
Koralo GmbH
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Evaluate the Continued Safety and Performance of the Foot and Ankle Products
Arthrex, Inc.
- Location
- Sacramento, CA + 2 other US sites
- Eligibility basics
- Ages 2+
- RecruitingHealthy volunteers
The Effects of a Nutritional Supplement on Sleep Quality
Athletic Greens International
- Location
- Santa Monica, CA
- Eligibility basics
- Ages 35–65
- RecruitingHealthy volunteers
cfDNA Assay Prospective Observational Validation for Early Cancer Detection and Minimal Residual Disease
Adela, Inc
- Location
- Duarte, CA + 15 other US sites
- Eligibility basics
- Ages 40+
- RecruitingHealthy volunteers
Accuracy Evaluation of the Owlet OSS 3.0-M1 Sensor in Toddlers and Preschoolers
Owlet Baby Care, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 1–5
- RecruitingHealthy volunteers
Efficacy in Controlling Myopia in Young Children Using a Novel Spectacle Lens
SightGlass Vision, Inc.
- Location
- Oakland, CA + 13 other US sites
- Eligibility basics
- Ages 6–8
- RecruitingHealthy volunteers
Study of Student Flourishing
Flourish Science, Inc.
- Location
- Berkeley, CA + 5 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteers
Comparison of Transforming Powder Dressing to NPIAP Recommended Standard of Care Therapies in Stage 2, 3 and 4 Pressure Injuries
ULURU Inc.
- Location
- San Diego, CA + 12 other US sites
- Eligibility basics
- Ages 18–85
- RecruitingHealthy volunteersPhase 4
Acute Partial Thickness Burn Study Comparing Transforming Powder Dressing to Standard of Care Dressing
ULURU Inc.
- Location
- Orange, CA + 5 other US sites
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteers
Prevention of Cervical Cancer Using the Genotyping Screening and Same-day Self-sampling
Atila Biosystems Inc.
- Location
- Sunnyvale, CA
- Eligibility basics
- Ages 30–64 · 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.