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 2
A Study to Assess the Efficacy, Safety and Tolerability of VLS-01 Buccal Film, Compared to Placebo in Patients With Treatment Resistant Depression (ELUMINA)
atai Therapeutics, Inc.
- Location
- Garden Grove, CA + 33 other US sites
- Eligibility basics
- Ages 18–65
- RecruitingPhase 2
A Study to Assess Anktiva in Patients With Long Covid-19.
ImmunityBio, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18–70
- RecruitingPhase 2
Imaging Immune Activation in COVID-19
CellSight Technologies, Inc.
- Location
- San Francisco, CA
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
Safety, Tolerability and Efficacy Study of ARCT-032 in People With Cystic Fibrosis
Arcturus Therapeutics, Inc.
- Location
- Los Angeles, CA + 10 other US sites
- Eligibility basics
- Ages 18+
- Recruiting
Prospective, Open-label, Non-significant Risk, Multicenter Study Comparing the Polyp Detection of the Study Device to That of the Colonoscopy Reference
Capso Vision, Inc.
- Location
- Chula Vista, CA + 10 other US sites
- Eligibility basics
- Ages 45–75
- RecruitingPhase 2
A Study to Evaluate the Safety and Tolerability of Eravacycline in Pediatric Patients Aged 8 to 17 With Complicated Intra-abdominal Infections (cIAI)
Tetraphase Pharmaceuticals, Inc
- Location
- Los Angeles, CA + 4 other US sites
- Eligibility basics
- Ages 8–17
- Recruiting
J-Valve Transfemoral Pivotal Study
JC Medical, Inc., an affiliate of Edwards Lifesciences LLC
- Location
- La Jolla, CA + 33 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
A Study to Assess the Efficacy and Safety of Efgartigimod IV in Adult Participants With Primary Immune Thrombocytopenia
argenx
- Location
- Los Angeles, CA + 16 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
A Study of the Effect of ZT-01 on Night-time Hypoglycemia in Type 1 Diabetes
Zucara Therapeutics Inc.
- Location
- Escondido, CA + 36 other US sites
- Eligibility basics
- Ages 18–75
- Recruiting
SELUTION4BTK Trial
M.A. Med Alliance S.A.
- Location
- Torrance, CA + 24 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 3
A Long-term Extension Study of Dazodalibep in Participants With Sjögren's Syndrome (SS)
Amgen
- Location
- Covina, CA + 30 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 1
A Single Bolus, 12-hour Euglycemic Clamp Study of the Safety, Pharmacokinetics (PK) and Glucodynamics (GD) of Intraperitoneal (IP) Portal Insulin U-500
Portal Diabetes, Inc.
- Location
- Chula Vista, CA
- Eligibility basics
- Ages 18–60
- RecruitingPhase 2
Efficacy and Safety of Obefazimod in Subjects With Moderately to Severely Active Crohn's Disease
Abivax S.A.
- Location
- Murrieta, CA + 23 other US sites
- Eligibility basics
- Ages 18–75
- RecruitingPhase 2
A Study of ORX750 in Participants With Narcolepsy and Idiopathic Hypersomnia
Centessa Pharmaceuticals (UK) Limited
- Location
- Long Beach, CA + 26 other US sites
- Eligibility basics
- Ages 18–65
- Recruiting
A Clinical Study of GeminiOne TEER System for the Treatment of Severe, Symptomatic MR.
Sierra Valve LLC
- Location
- Thousand Oaks, CA
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
A Study of TAK-411 in Adults With Chronic Inflammatory Demyelinating Polyradiculoneuropathy (CIDP)
Takeda
- Location
- La Jolla, CA + 11 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
HP-211 Safety and Proof of Concept Dose Ranging Study in Patients With Type 2 Diabetes
Housey Healthcare ULC
- Location
- Canoga Park, CA + 24 other US sites
- Eligibility basics
- Ages 18+
- Recruiting
Cardiac RADIoablation Versus Repeat Catheter Ablation: a Pivotal Randomized Clinical Trial Evaluating Safety and Efficacy for Patients With High-risk Refractory Ventricular Tachycardia (RADIATE-VT)
Varian, a Siemens Healthineers Company
- Location
- Los Angeles, CA + 10 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 4
Study Evaluating the Safety and Efficacy of Neffy or Intramuscular Adrenalin in Patients With Allergic Reactions After Oral Food Challenge or Allergen Immunotherapy
ARS Pharmaceuticals, Inc.
- Location
- La Jolla, CA + 5 other US sites
- Eligibility basics
- Ages 4+
- Recruiting
Gemini Study: A Prospective, Multicenter Evaluation of Performance and Safety of the Eversense Gemini System With Flash Glucose Measurement Feature
Senseonics, Inc.
- Location
- Escondido, CA
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
A Research Study on How Well Different Doses of the Medicine UBT251 Help People Living With Overweight or Obesity
Novo Nordisk A/S
- Location
- Cypress, CA + 1 other US site
- Eligibility basics
- Ages 18–65
- Recruiting
ROME GS System Study
Senseonics, Inc.
- Location
- Escondido, CA + 2 other US sites
- Eligibility basics
- Ages 18+
- RecruitingPhase 2
Study to Evaluate Sotatercept (MK-7962) in Children With Pulmonary Arterial Hypertension (PAH) (MK-7962-008)
Merck Sharp & Dohme LLC
- Location
- Los Angeles, CA + 8 other US sites
- Eligibility basics
- Ages 1–17
- RecruitingPhase 1/Phase 2
A Study of AAV9 Gene Therapy in Participants With Canavan Disease (CANaspire Clinical Trial)
Aspa Therapeutics
- Location
- Oakland, CA + 2 other US sites
- Eligibility basics
- Up to age 2