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 1/Phase 2
A Study to Investigate the Safety, Tolerability, and Efficacy of AZD0120 in Adults With Refractory SLE
AstraZeneca
- Location
- San Francisco, CA + 8 other US sites
- Eligibility basics
- Ages 18–70
- RecruitingPhase 3
STOP-HAE: A Phase 3 Study of ADX-324 in HAE
ADARx Pharmaceuticals, Inc.
- Location
- San Diego, CA + 14 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 1
A Study to Investigate the Safety and Preliminary Efficacy of ALLO-329, an Allogeneic CAR T-cell Therapy, in Adults With Autoimmune Disease
Allogene Therapeutics
- Location
- Loma Linda, CA + 15 other US sites
- Eligibility basics
- Ages 18–74
- RecruitingPhase 3
Efficacy and Safety of Intranasal Cenegermin in Adult Participants With Non-Arteritic Anterior Ischemic Optic Neuropathy (NAION)
Dompé Farmaceutici S.p.A
- Location
- Los Angeles, CA + 13 other US sites
- Eligibility basics
- Ages 50–80
- Recruiting
JAGUAR Trial: ObJective Analysis to GaUge EVAR Outcomes Through Randomization
Endologix
- Location
- La Jolla, CA + 24 other US sites
- Eligibility basics
- Ages 21+
- Recruiting
DEFIANCE: RCT of ClotTriever System Versus Anticoagulation In Deep Vein Thrombosis
Inari Medical
- Location
- Orange, CA + 32 other US sites
- Eligibility basics
- Ages 18+
- Recruiting
Investigation of the BrioVAD System for the Treatment of Left Ventricular Heart Failure
BrioHealth Solutions, Inc.
- Location
- Los Angeles, CA + 46 other US sites
- Eligibility basics
- Ages 18–100
- RecruitingPhase 1
A Study to Assess the Safety and Clinical Activity of Azer-cel in Participants With B-cell Mediated Autoimmune Disorders
TG Therapeutics, Inc.
- Location
- La Jolla, CA + 7 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
A Study to Investigate the Long-term Safety and Efficacy of Belimumab in Adults With Interstitial Lung Disease (ILD) Associated With Systemic Sclerosis (SSc) and Other Connective Tissue Diseases (CTD) (BLISSconneCTD-OLE)
GlaxoSmithKline
- Location
- Los Angeles, CA + 2 other US sites
- Eligibility basics
- Ages 18+
- Recruiting
CellFX® Nanosecond Pulsed Field Ablation (nsPFA)™ Cardiac Surgery Clamp System to Treat Atrial Fibrillation
Pulse Biosciences, Inc.
- Location
- St. Helena, CA + 2 other US sites
- Eligibility basics
- Ages 18–85
- RecruitingPhase 3
Study to Assess the Efficacy, Pharmacokinetics, Safety and Tolerability of Iptacopan in Pediatric Patients With Primary IgAN
Novartis Pharmaceuticals
- Location
- Madera, CA + 4 other US sites
- Eligibility basics
- Ages 2–18
- Recruiting
Safety and Effectiveness of the BrainsWay Deep Transcranial Magnetic Stimulation (Deep TMS) for Treatment and Reduction of Heavy Drinking in Individuals With of Alcohol Use Disorder (AUD)
Brainsway
- Location
- La Jolla, CA + 7 other US sites
- Eligibility basics
- Ages 18–86
- RecruitingPhase 3
A Long-Term Study of Zasocitinib in Children and Teenagers With Plaque Psoriasis
Takeda
- Location
- Chula Vista, CA + 10 other US sites
- Eligibility basics
- Ages 4–17
- RecruitingPhase 3
Continuation Study of Zasocitinib in Adults With Psoriatic Arthritis
Takeda
- Location
- Fountain Valley, CA + 18 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
52-week Open Label Safety-Tolerability Study
LB Pharmaceuticals Inc.
- Location
- Anaheim, CA + 22 other US sites
- Eligibility basics
- Ages 18–65
- RecruitingPhase 1/Phase 2
Study of Intrathecal ELP-02 for Charcot-Marie-Tooth Disease Type 4J (CMT4J)
Elpida Therapeutics SPC
- Location
- Palo Alto, CA
- Eligibility basics
- Ages 3–20
- RecruitingPhase 1
A Research Study Investigating How a New Medicine NNC0113-5840 Works in People With Overweight or Obesity
Novo Nordisk A/S
- Location
- Glendale, CA + 1 other US site
- Eligibility basics
- Ages 18–55
- RecruitingPhase 1
A Study to Evaluate Sequential Administration of Injections of AGN-151586 Followed by BOTOX in Adult Participants for Treatment of Glabellar Lines
AbbVie
- Location
- Newport Beach, CA + 7 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
Research Study on How Well Oral Semaglutide Works for Weight Loss in Adults With Excess Body Weight
Novo Nordisk A/S
- Location
- Escondido, CA + 14 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
A Study of Baricitinib (LY3009104) in Children From 6 Years to Less Than 18 Years of Age With Alopecia Areata
Eli Lilly and Company
- Location
- Los Angeles, CA + 28 other US sites
- Eligibility basics
- Ages 6–17
- RecruitingPhase 2/Phase 3
A Study of the Efficacy and Safety of Belimumab in Adults With Systemic Sclerosis Associated Interstitial Lung Disease
GlaxoSmithKline
- Location
- Los Angeles, CA + 16 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
A Study of the Efficacy and Safety of Belimumab in Adults With Interstitial Lung Disease Associated With Connective Tissue Disease
GlaxoSmithKline
- Location
- Los Angeles, CA + 13 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
A Study of IPN10200 for the Treatment of Cervical Dystonia in Adults
Ipsen
- Location
- Fountain Valley, CA + 6 other US sites
- Eligibility basics
- Ages 18–80
- RecruitingPhase 2
Study of TX000045 in Participants With Pulmonary Hypertension Due to Interstitial Lung Disease
Tectonic Operating Company, Inc.
- Location
- San Francisco, CA + 1 other US site
- Eligibility basics
- Ages 18–80