Location · California
Clinical trials recruiting in California
1900 recruiting studies have at least one site in California; 700 accept healthy volunteers. Studies that need a specific condition are included too, so check each listing.
Want the research companies that run paid Phase 1 studies for healthy volunteers? Paid clinical trial companies in California.
1,900 recruiting studiesSource: ClinicalTrials.gov, refreshed October 27, 2026How we list studies
More recruiting studies (pay not posted)
- RecruitingPhase 3
A Study of Vedolizumab in Children and Teenagers With Ulcerative Colitis or Crohn's Disease
Takeda
- Location
- Orange, CA + 2 other US sites
- Eligibility basics
- Ages 2–17
- Recruiting
ATLAS (AltaValve) Pivotal Trial
4C Medical Technologies, Inc.
- Location
- La Jolla, CA + 35 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
Study of WAL0921 in Patients With Glomerular Kidney Diseases
Walden Biosciences
- Location
- Los Angeles, CA + 8 other US sites
- Eligibility basics
- Ages 18–75
- RecruitingPhase 2
Zelquistinel or Placebo for the Reduction of Symptoms of Major Depressive Disorder
Syndeio Biosciences, Inc
- Location
- Irvine, CA + 20 other US sites
- Eligibility basics
- Ages 18–64
- RecruitingPhase 2
A Study to Investigate the Safety and Efficacy of GSK4532990 Compared With Placebo in Adult Participants Aged 18 to 70 Years With Alcohol-related Liver Disease
GlaxoSmithKline
- Location
- Coronado, CA + 28 other US sites
- Eligibility basics
- Ages 18–70
- Recruiting
FORWARD CAD IDE Study
Shockwave Medical, Inc.
- Location
- La Jolla, CA + 27 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
A Clinical Trial of Elsunersen in Pediatric SCN2A-DEE to Assess Efficacy and Safety
Praxis Precision Medicines
- Location
- San Diego, CA + 5 other US sites
- Eligibility basics
- Ages 0 mo–18
- Recruiting
Evaluation of the Fully Closed Loop Omnipod® System in Type 2 Diabetes
Insulet Corporation
- Location
- Los Angeles, CA + 25 other US sites
- Eligibility basics
- Ages 18–75
- Recruiting
Efficacy of the Omnipod® 6 System Compared With the Omnipod® 5 System
Insulet Corporation
- Location
- Los Angeles, CA + 10 other US sites
- Eligibility basics
- Ages 14–75
- RecruitingPhase 1/Phase 2
Study of Aritinercept in Patients With Generalized Myasthenia Gravis
Aurinia Pharmaceuticals Inc.
- Location
- Pasadena, CA + 9 other US sites
- Eligibility basics
- Ages 18–85
- RecruitingPhase 4
PRESERVE: LUPKYNIS in Combination With Belimumab, Obinutuzumab or Anifrolumab in Patients With Lupus Nephritis
Aurinia Pharmaceuticals Inc.
- Location
- La Mesa, CA + 26 other US sites
- Eligibility basics
- Ages 18–75
- RecruitingPhase 2/Phase 3
A Study of Nipocalimab in Children Aged 2 to Less Than 18 Years With Generalized Myasthenia Gravis
Janssen Research & Development, LLC
- Location
- Palo Alto, CA + 7 other US sites
- Eligibility basics
- Ages 2–17
- RecruitingPhase 2
JUST BREATHE, Breathing Life Into Innovative Therapies for ARDS- Cohort C: Bevacizumab
PPD Development, LP
- Location
- Fresno, CA + 27 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
JUST BREATHE, Breathing Life Into Innovative Therapies for ARDS- Cohort B: Paridiprubart
PPD Development, LP
- Location
- Fresno, CA + 27 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
JUST BREATHE, Breathing Life Into Innovative Therapies for ARDS- Cohort A: Vilobelimab
PPD Development, LP
- Location
- Fresno, CA + 27 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
JUST BREATHE, Breathing Life Into Innovative Therapies for ARDS (Master Record)
PPD Development, LP
- Location
- Fresno, CA + 26 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 1
Study of BHV-1300 in Graves' Disease
Biohaven Therapeutics Ltd.
- Location
- South Gate, CA + 9 other US sites
- Eligibility basics
- Ages 18–65
- RecruitingPhase 2
AlloNK®, an Allogeneic Non-genetically Modified, Cord Blood-derived NK Cell Therapy, in Combination With Rituximab, Studied in Relapsing Forms of B-cell Dependent Rheumatologic Diseases.
Artiva Biotherapeutics, Inc.
- Location
- Chula Vista, CA + 29 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 1/Phase 2
Phase 1/2 Study of MZ-1866, an AAV-9 Gene Therapy Delivered by Intracerebroventricular Injection to Participants With Pitt Hopkins Syndrome
Mahzi Therapeutics
- Location
- Oakland, CA + 2 other US sites
- Eligibility basics
- Ages 2–25
- Recruiting
Effects of Transcranial Focused Ultrasound Stimulation (tFUS) on Neurological and Cognitive Outcomes in Parkinson's Disease
Sanmai Technologies PBC dba Sanmai
- Location
- Santa Monica, CA + 3 other US sites
- Eligibility basics
- Ages 22–80
- Recruiting
GORE® CARDIOFORM Septal Occluder and Antiplatelet Medical Management for Reduction of Recurrent Stroke in Patients With Patent Foramen Ovale (PFO): the REDUCE Post Approval Study
W.L.Gore & Associates
- Location
- La Jolla, CA + 30 other US sites
- Eligibility basics
- Ages 18–70
- Recruiting
GORE® ENFORM Biomaterial Product Study
W.L.Gore & Associates
- Location
- San Diego, CA + 6 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
Study to Assess the Efficacy and Safety of IMVT-1402 in Participants With Mild to Severe Generalized Myasthenia Gravis
Immunovant Sciences GmbH
- Location
- Carlsbad, CA + 47 other US sites
- Eligibility basics
- Ages 18–80
- Recruiting
Paclitaxel-Coated Balloon Treatment of Chronic Rhinosinusitis
Airiver Medical, Inc.
- Location
- San Diego, CA + 9 other US sites
- Eligibility basics
- Ages 18+