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California Paid Clinical Trials
A listing of 5602 clinical trials in California actively recruiting volunteers for paid trials and research studies in various therapeutic areas.
1453 - 1464 of 5602
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California is currently home to 5602 active clinical trials, seeking participants for engagement in research studies. These trials take place at a variety of cities in the state, including Los Angeles, San Francisco, San Diego and Sacramento. Whether you're a healthy volunteer interested in paid medical research or someone seeking trials related to a specific condition, the state offers a diverse array of opportunities in your vicinity.
Featured Trial
Healthy Participants Needed (Colonoscopy + Cancer Screening)
Recruiting
Earn $325 - $475 in electronic payment card compensation for your time and effort by participating in a clinical study to develop a blood test that may one day help screen for colon cancer. Take a quick quiz to see if you qualify.
Conditions:
Healthy
Healthy Volunteers
Healthy Subjects
Healthy Volunteer
Healthy Participants
Featured Trial
Paid Clinical Studies Nationwide
Recruiting
Nationwide clinical trials offered in your area. Some trials offering up to several thousand dollars in compensation for participation.
Conditions:
Healthy
Healthy Volunteer Study
Featured Trial
Buy Retatrutide Online Through Celia
Recruiting
Retatrutide (formerly M25) is an investigational peptide being studied for its potential in supporting weight management and metabolic health. It acts on GLP-1, GIP, and glucagon receptors to influence appetite, energy regulation, and fat metabolism.
Conditions:
Healthy
Featured Offer
Find the Best GLP-1 Weight Loss Providers (2025)
Recruiting
Cutting-edge GLP-1 treatments like semaglutide and tirzepatide are helping thousands lose weight with medically guided support. But with so many online providers, how do you know which programs are trusted, affordable, and right for you?
We reviewed the top GLP-1 brands of 2025 — comparing pricing, prescription process, shipping, pharmacy partners, and real user ratings — to help you find a safe, convenient, and effective path toward your weight-loss goals.
- 100% online programs
- Licensed U.S. clinicians
- Fast shipping & flexible payments
See the rankings & choose the GLP-1 provider that fits your life.
We reviewed the top GLP-1 brands of 2025 — comparing pricing, prescription process, shipping, pharmacy partners, and real user ratings — to help you find a safe, convenient, and effective path toward your weight-loss goals.
- 100% online programs
- Licensed U.S. clinicians
- Fast shipping & flexible payments
See the rankings & choose the GLP-1 provider that fits your life.
Conditions:
Overweight
Overweight and Obesity
Obesity
Weight Loss
Morbid Obesity
Featured Trial
Depression Clinical Trial
Recruiting
Join us in researching a potential investigational treatment for Depression. Reimbursement for study-related expenses may be available to you.
Qualifying participants:
•Are between 18-65
•Have been experiencing a major depressive episode for at least a month
Qualifying participants:
•Are between 18-65
•Have been experiencing a major depressive episode for at least a month
Conditions:
Depression
Major Depressive Disorder
Depressive Disorder
Depressive Symptoms
Depressive Disorder
MHE3 Clinical Trial - Overcoming Obstacles
Recruiting
The goal of this clinical trial is to increase and strengthen connections between Latinx individuals and mental health services. Through this intervention, the investigators aim to improve mental health literacy, decrease stigma, increase coping skills, and increase mental health help seeking, even before they are in crisis. Participants will be asked to participate in six educational sessions hosted by Promotores de Salud.
Gender:
ALL
Ages:
Between 18 years and 65 years
Trial Updated:
07/27/2025
Locations: Stanford University, Palo Alto, California
Conditions: Mental Health Services, Community Mental Health Services, Community Health Services, Preventive Health Services, Counseling, Community Networks, Community Participation, Hispanic or Latino
Ivonescimab for the Treatment of Thymic Cancer
Recruiting
This phase II trial tests how well ivonescimab works in treating patients with thymic carcinoma. Immunotherapy with monoclonal antibodies, such as ivonescimab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: UCLA / Jonsson Comprehensive Cancer Center, Los Angeles, California
Conditions: Thymus Carcinoma
A Study to Assess Efficacy, Safety, Tolerability, Pharmacokinetics (PK) and Pharmacodynamics (PD) of RO7204239 in Combination With Tirzepatide in Participants With Obesity or Overweight With At Least One Weight-related Comorbidity
Recruiting
The main aim of the study is to assess the effect of RO7204239 in combination with tirzepatide, compared to placebo in combination with tirzepatide, on body weight loss after 48 weeks of treatment in adults with obesity or overweight with at least one weight-related comorbidity, but without diabetes mellitus (DM). The study comprises of a 4-week screening period; a 48-week core treatment period, where all participants will receive tirzepatide as background treatment and will be randomized to one... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: Encompass Clinical Research, Spring Valley, California
Conditions: Obesity, Overweight, Overweight With One Weight Related Comorbidity
A Study Evaluating the Efficacy and Safety of ALG-000184 Compared With Tenofovir Disoproxil Fumarate in Untreated HBeAg-Positive and HBeAg- Negative Adult Subjects With Chronic Hepatitis B (B-SUPREME)
Recruiting
This is a Phase 2 study to evaluate efficacy and safety of 48 weeks of oral once daily monotherapy with ALG-000184 versus tenofovir disproxil fumarate (TDF) for chronic HBV infection.
Gender:
ALL
Ages:
Between 18 years and 65 years
Trial Updated:
07/25/2025
Locations: Aligos Investigational Site, Coronado, California
Conditions: Chronic Hepatitis B Infection
A Study to Evaluate Two Dosing Regimens of Subcutaneous Nivolumab in Combination With Intravenous Ipilimumab and Chemotherapy in Participants With Previously Untreated Metastatic or Recurrent Non-Small Cell Lung Cancer (NSCLC)
Recruiting
The purpose of this study is to evaluate two dosing regimens of subcutaneous Nivolumab in combination with intravenous Ipilimumab and chemotherapy in participants with previously untreated metastatic or recurrent Non-Small Cell Lung Cancer (NSCLC)
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: Local Institution - 0062, Los Angeles, California
Conditions: Non-Small Cell Lung Cancer
Clinical Course Of Disease In Participants With FA-CM
Recruiting
Characteristics and clinical course of disease In participants with cardiomyopathy associated with Friedreich Ataxia (CLARITY-FA)
Gender:
ALL
Ages:
6 years and above
Trial Updated:
07/25/2025
Locations: University of California San Diego, La Jolla, California
Conditions: Friedreich Ataxia, Cardiomyopathy
Phase 3 Study of PDS0101 and Pembrolizumab in HPV16+ Recurrent/Metastatic Head and Neck Squamous Cell Carcinoma
Recruiting
This is a global, multi-center, Phase 3 study that is randomized 2:1, controlled, and open label to evaluate PDS0101 (Versamune + HPVMix) in combination with pembrolizumab vs. pembrolizumab monotherapy as first-line treatment in patients with unresectable recurrent or metastatic HPV16-positive HNSCC expressing programmed cell death ligand-1 (PD-L1) with combined positive score (CPS) ≥1.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: Marin Cancer Care, Greenbrae, California
Conditions: Recurrent Head and Neck Cancer, Metastatic Head and Neck Cancer, HPV Positive Oropharyngeal Squamous Cell Carcinoma, Neoplasms, Head and Neck, Unresectable Head and Neck Squamous Cell Carcinoma
A Global Phase III Study of Rilvegostomig or Pembrolizumab Plus Chemotherapy for First-Line Treatment of Metastatic Squamous Non-small Cell Lung Cancer (NSCLC)
Recruiting
The purpose of ARTEMIDE-Lung02 is to assess the efficacy and safety of rilvegostomig in combination with platinum-based chemotherapy for the first-line (1L) treatment of patients with metastatic squamous non-small cell lung cancer (mNSCLC) whose tumors express programmed death-ligand 1 (PD-L1).
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: Research Site, Beverly Hills, California
Conditions: Non-small Cell Lung Cancer
A Study of the Efficacy and Safety of Belimumab in Adults With Interstitial Lung Disease Associated With Connective Tissue Disease
Recruiting
Interstitial lung disease (ILD) is a lung condition resulting in inflammation and stiffening of the lung, often associated with connective tissue diseases (CTDs). ILD causes reduction in lung volume, shortness of breath, cough and fatigue therefore has high impact on quality of life and is also the leading cause of death in participants with these conditions. The study will assess whether treatment of CTD-ILD participants with belimumab in addition to standard therapy will result in the stabiliz... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: GSK Investigational Site, Los Angeles, California
Conditions: Lung Diseases, Interstitial
A Study of Obexelimab in Patients With Systemic Lupus Erythematosus
Recruiting
This study aims to examine the efficacy and safety of obexelimab in participants with systemic lupus erythematosus (SLE).
Gender:
ALL
Ages:
Between 18 years and 70 years
Trial Updated:
07/25/2025
Locations: Sierra Pacific Arthritis and Rheumatology Centers, Fresno, California
Conditions: Systemic Lupus Erythematosus
A Study to Learn More About How Well Sevabertinib (BAY 2927088) Works and How Safe it is Compared With Standard Treatment, in Participants Who Have Advanced Non-small Cell Lung Cancer (NSCLC) With Mutations of the Human Epidermal Growth Factor Receptor 2 (HER2)
Recruiting
Researchers are looking for a better way to treat people who have advanced non-small cell lung cancer (NSCLC) with specific genetic changes called human epidermal growth factor receptor 2 (HER2) mutations.
Advanced NSCLC is a group of lung cancers that have spread to nearby tissues or to other parts of the body or that are unlikely to be cured or controlled with currently available treatments. HER2 is a protein that helps cells to grow and divide. A damage (also called mutation) to the building... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: Patty & George Hoag Cancer Center, Newport Beach, California
Conditions: Advanced Non-small Cell Lung Cancer, HER2 Mutation
Phase III, Open-label, Study of First-line Dato-DXd in Combination With Rilvegostomig for Advanced Non-squamous NSCLC With High PD-L1 Expression (TC ≥ 50%) and Without Actionable Genomic Alterations
Recruiting
The purpose of this study is to evaluate efficacy and safety of Dato-DXd in combination with rilvegostomig or rilvegostomig monotherapy compared with pembrolizumab monotherapy as a first line therapy in participants with locally advanced or metastatic non-squamous NSCLC with high PD-L1 expression (TC ≥ 50%) and without actionable genomic alterations.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/25/2025
Locations: Research Site, Anaheim, California
Conditions: Non-Small Cell Lung Cancer
1453 - 1464 of 5602
Kaiser Permanente houses over 6,000 physicians in southern California and it is also one of the largest research centers on the state. On its clinical trial division, Kaiser Permanente conducts clinical trials of almost every specialty funded by pharmaceutical companies, government, and foundations.
The Cedars-Sinai Medical Center located in Los Angeles is one of the largest research centers owned and operated by a private hospital in the United States. Focusing on biomedical, cancer, and heart research among other specialties, you can find almost any type of clinical trials for both health and non-healthy volunteers at the research division of Cedar-Sinai Medical Center.
There are around 100,000 clinical trials happening every year across the United States about almost every condition out there. While most clinical trials are testing drugs or medical devices there are also many behavioral and observational trials going on at any point in time. Many paid research studies are held at these California locations.
Clinical trials are incredibly important for making new medical and scientific discoveries, finding new and better methods for diagnosing medical conditions early, testing new interventions, and even developing safer and more effective surgical procedures.
In order for all these discoveries to me made available to the general population they need to go through years of rigorous testing both in healthy and non-healthy volunteers. During those years, medical professionals follow a protocol that has been previously approved by the FDA or other regulatory agency to test the effectiveness and safety of their discovery.
Other people choose to participate in a clinical trial because they feel it is a good way to contribute to the advancement of medical knowledge and that their participation can help many people in the future. The following lists of trials are broken down by condition, and to find a specific clinical trial in your area click through to clinicaltrials.gov.
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