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
4 studies with pay posted
Exact amounts posted by the research company for each study. The button opens that study’s own page.
Pays up to
$32,150
Clinical Trial for Healthy Adults with Overweight or Obesity (N-38160)
Altasciences · Cypress, CA
Two schedule options (up to $17,750 or up to $32,150), with multi-night stays and outpatient visits.
Ages 18+ · Male/Female
View study & apply (opens in a new tab)Opens Altasciences’s page for this exact study
Pays up to
$26,600
Healthy Volunteers Needed for a Clinical Trial (N-40600)
Altasciences · Cypress, CA
Ages 18–55 · Male/Female
View study & apply (opens in a new tab)Opens Altasciences’s page for this exact study
Pays up to
$16,050
Healthy but Overweight Volunteers Needed (N-39610)
Altasciences · Cypress, CA
Ages 18–55 · Male/Female
View study & apply (opens in a new tab)Opens Altasciences’s page for this exact study
Pays up to
$8,950
Clinical Research Study for Healthy Males (N-40700)
Altasciences · Cypress, CA
Ages 18–59 · Male
View study & apply (opens in a new tab)Opens Altasciences’s page for this exact study
More recruiting studies (pay not posted)
- RecruitingHealthy volunteersPhase 1Overnight stay mentioned
A Study to Investigate the Relative Bioavailability and Safety of Different Oral Formulations of Elecoglipron in Healthy Participants
AstraZeneca
- Location
- Glendale, CA + 1 other US site
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1Overnight stay mentioned
A Phase I Study to Investigate the Pharmacokinetics and Safety of Capivasertib in Participants With Moderate Hepatic Impairment
AstraZeneca
- Location
- Rialto, CA + 1 other US site
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 1Overnight stay mentioned
A Study to Learn How the Body Processes the Study Medicine PF-07328948 in People With Reduced Kidney Function
Pfizer
- Location
- Lake Forest, CA + 3 other US sites
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 1Overnight stay mentioned
Phase 1 Study of SBS-147 in Healthy Adults
Sparian Biosciences, Inc
- Location
- Cypress, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1/Phase 2
A Study of BLB-201 RSV Vaccine in Infants and Children
Blue Lake Biotechnology Inc.
- Location
- La Mesa, CA + 13 other US sites
- Eligibility basics
- Ages 6 mo–5
- RecruitingHealthy volunteersPhase 1
A Study of V132 in Healthy Older Participants (V132-001)
Merck Sharp & Dohme LLC
- Location
- Anaheim, CA + 9 other US sites
- Eligibility basics
- Ages 50–75
- RecruitingHealthy volunteersPhase 1
A Study to Investigate Pharmacokinetics (PK), Safety, and Tolerability of VH4367310 in Healthy Adult Participants
ViiV Healthcare
- Location
- Glendale, CA + 1 other US site
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1
Study of S-892216 Long-acting Injectable (LAI) in Healthy Adult Participants
Shionogi
- Location
- Cypress, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1
A Study of LY4006896 in Healthy Participants and Participants With Parkinson's Disease
Eli Lilly and Company
- Location
- Los Alamitos, CA + 7 other US sites
- Eligibility basics
- Ages 30–85
- RecruitingHealthy volunteersPhase 1/Phase 2
Phase 1/2 Study of Respiratory Syncytial Virus and Human Metapneumovirus (RSV+HMPV) Vaccine Candidate in Adults 60 Years of Age and Older
Sanofi
- Location
- Huntington Beach, CA + 49 other US sites
- Eligibility basics
- Ages 60+
- RecruitingHealthy volunteersPhase 1
A Study to Test How BI 1291583 is Taken up in the Blood of People With and Without Liver Problems
Boehringer Ingelheim
- Location
- Rialto, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 1
A Study to Investigate Safety, Tolerability, and Pharmacokinetics of AZD3974 in Healthy Participants
AstraZeneca
- Location
- Glendale, CA + 1 other US site
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1
A Study to Investigate Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of AZD1043 in Healthy Adult Participants Living With Overweight and/or Obesity.
AstraZeneca
- Location
- Glendale, CA + 1 other US site
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1
First-in-Human Trial to Assess REGN20423 in Healthy Adult Participants and Adult Participants With Atopic Dermatitis
Regeneron Pharmaceuticals
- Location
- West Hills, CA + 5 other US sites
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1
A Clinical Study of Novel Pneumococcal Vaccine V118C in Children (V118C-002)
Merck Sharp & Dohme LLC
- Location
- Madera, CA + 14 other US sites
- Eligibility basics
- Ages 2 mo–1
- RecruitingHealthy volunteersPhase 1
A Study to Evaluate Safety, Tolerability and Pharmacokinetics of Orally Administered TIX100 in Healthy Subjects
TIXiMED, Inc.
- Location
- Chula Vista, CA
- Eligibility basics
- Ages 18–70
- RecruitingHealthy volunteersPhase 1/Phase 2
Study of XmAb942 in Healthy Participants and Participants With Ulcerative Colitis
Xencor, Inc.
- Location
- Palo Alto, CA + 27 other US sites
- Eligibility basics
- Ages 18–75
- RecruitingHealthy volunteersPhase 1
A Study of BBT001 in Healthy Volunteers (HVs) and in Adult Patients With Atopic Dermatitis (AD)
Bambusa Therapeutics
- Location
- Irvine, CA + 2 other US sites
- Eligibility basics
- Ages 18–72
- RecruitingHealthy volunteersPhase 1
A Study to Investigate the Safety and Pharmacokinetics of Single- and Multiple-ascending Doses of AZD4916 in Healthy Volunteers
AstraZeneca
- Location
- Glendale, CA
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1
A Study to Assess Safety, Tolerability, and How Single and Multiple Injections or Infusions of ABBV-313 Affects the Body of Adult Participants
AbbVie
- Location
- Anaheim, CA + 1 other US site
- Eligibility basics
- Ages 18–55
- RecruitingHealthy volunteersPhase 1
Safety and Drug Concentrations of REGN20934 in Adults With Overweight or Obesity
Regeneron Pharmaceuticals
- Location
- Glendale, CA
- Eligibility basics
- Ages 18–65
- RecruitingHealthy volunteersPhase 1
A Study to Evaluate the Drug Levels, Absolute Bioavailability, Safety, Tolerability, and Immunogenicity of Single-Dose of BMS-986446 in Healthy Adults After Single-dose Administration, and Participants With Early…
Bristol-Myers Squibb
- Location
- Anaheim, CA
- Eligibility basics
- Ages 18–80
- RecruitingHealthy volunteersPhase 1/Phase 2
Study to Assess Safety and Immunogenicity of an Egg-based H5N8 Influenza Vaccine at Multiple Dose Levels Adjuvanted With Matrix-M in Healthy Participants 18 Years of Age and Above.
Sanofi
- Location
- Rolling Hills Estates, CA + 15 other US sites
- Eligibility basics
- Ages 18+
- RecruitingHealthy volunteersPhase 1/Phase 2
First-in-human Study of the Safety, Tolerability, Pharmacokinetics, and Food Effect of ACCG-2671
Aconcagua Bio, Inc. a wholly owned subsidiary of Structure Therapeutics
- Location
- Lake Forest, CA + 2 other US sites
- Eligibility basics
- Ages 25–75
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.