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California Paid Clinical Trials
A listing of 5590 clinical trials in California actively recruiting volunteers for paid trials and research studies in various therapeutic areas.
1021 - 1032 of 5590
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California is currently home to 5590 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
Paid Clinical Studies Nationwide
Recruiting
Nationwide clinical trials offered in your area. Some trials offering up to several thousand dollars in compensation for participation.
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Conditions:
Overweight
Overweight and Obesity
Obesity
Weight Loss
Morbid Obesity
A Study on the Immune Response and Safety of an Investigational Chickenpox Vaccine and a Marketed Measles, Mumps and Rubella Vaccine When Administered as Intramuscular Injection to Healthy Children 12 to 15 Months of Age
Recruiting
This study aims to assess the immune response and safety of GSK's candidate chickenpox and marketed MMR vaccines when given to children 12 to 15 months of age via a muscle injection. It compares the GSK vaccines to Merck's chickenpox vaccine, administered just under the skin. Additionally, the study will evaluate the immune response and safety of giving the GSK vaccines along with other childhood vaccines through a muscle injection.
Gender:
ALL
Ages:
Between 12 months and 15 months
Trial Updated:
06/16/2025
Locations: GSK Investigational Site, Huntington Park, California
Conditions: Chickenpox
A Study to Explore the Efficacy of JNJ-89495120 in the Treatment of Major Depressive Disorder
Recruiting
The purpose of this study is to evaluate how well JNJ-89495120 works (anti-depressant effects) and how well it is tolerated as compared to placebo on reducing the symptoms of depression in participants with major depressive disorder (MDD).
Gender:
ALL
Ages:
Between 18 years and 64 years
Trial Updated:
06/16/2025
Locations: CI Trials, Bellflower, California
Conditions: Depressive Disorder, Major
Safety and Efficacy Study of Sivopixant, Acetazolamide and SASS-001 in Sleep Apnea
Recruiting
The primary purpose of this study is to evaluate the effectiveness of sivopixant, acetazolamide and SASS-001 in adults with sleep apnea with a central component.
Gender:
ALL
Ages:
Between 18 years and 85 years
Trial Updated:
06/16/2025
Locations: Altman Clinical and Translational Research Institute (ACTRI), La Jolla, California
Conditions: Sleep Apnea
Study of a 4-Dose Regimen of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From Approximately 2 Months of Age
Recruiting
This study is a Phase 3, randomized, modified double-blind study which aims to measure whether PCV21 vaccine (investigational pneumococcal conjugate vaccine) is safe and can help the body to develop germ-fighting agents called "antibodies" (immunogenicity) compared with 20-valent pneumococcal vaccine (Prevnar 20, licensed pneumococcal conjugate vaccine) when they are administered with routine pediatric vaccines in infants aged from approximately 2 months (42 to 89 days).
The study duration per... Read More
Gender:
ALL
Ages:
Between 42 days and 89 days
Trial Updated:
06/16/2025
Locations: Century Research Institute- Site Number : 8400065, Huntington Park, California
Conditions: Pneumococcal Immunization
A Study to Evaluate the Effectiveness of Long-acting (LA) Cabotegravir (CAB) + Rilpivirine (RPV) LA When Given to Participants With Detectable HIV-1
Recruiting
This study will assess how effective, safe, and long-lasting a long-acting antiretroviral therapy (ART) using CAB LA + RPV LA is for people with HIV who still have detectable virus levels despite being on oral ART. The study will also consider feedback from patients on their experience with this treatment.
Gender:
ALL
Ages:
12 years and above
Trial Updated:
06/16/2025
Locations: GSK Investigational Site, Los Angeles, California
Conditions: HIV Infections
A Trial of Casdozokitug in Combination With Toripalimab Plus Bevacizumab in Participants With Unresectable and/or Locally Advanced or Metastatic Hepatocellular Carcinoma
Recruiting
The main goals of this study are to evaluate the safety and efficacy of casdozokitug in combination with toripalimab plus bevacizumab and to define a recommended dose for casdozokitug in combination with toripalimab plus bevacizumab.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/16/2025
Locations: Beverly Hills Cancer Center, Beverly Hills, California
Conditions: Hepatocellular Carcinoma
Phase 1 Study of ACR-2316 in Specific Advanced Solid Tumors
Recruiting
This is a first in-human, Open-label Phase 1 study to assess the safety of ACR-2316 for the treatment of subjects with specific, histologically confirmed, locally advanced, recurrent or metastatic solid tumors.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/16/2025
Locations: Precision NextGen Oncology & Research Center, Beverly Hills, California
Conditions: Specific Advanced Solid Tumors
A Study to Test Whether Spesolimab Helps People With a Skin Condition Called Pyoderma Gangrenosum
Recruiting
The purpose of this study is to find out whether a medicine called spesolimab helps people with pyoderma gangrenosum (PG). The main aim is to see whether spesolimab leads to closure of PG ulcers. This study is open to adults with ulcerative PG with at least 1 ulcer that measures between 5 cm\^2 to 80 cm\^2 in size.
This study has 2 parts. In Part 1, participants are put into groups randomly, which means by chance. 1 group gets spesolimab and the other group gets placebo. Placebo injections look... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/16/2025
Locations: University of California Irvine, Orange, California
Conditions: Pyoderma Gangrenosum
A Study to Evaluate ALN-BCAT in Patients With Hepatocellular Carcinoma
Recruiting
The purpose of the dose escalation part of the study is to characterize the safety and tolerability of ALN-BCAT as monotherapy and in combination with pembrolizumab; and to determine the recommended dose(s) for expansion (RDFE) of ALN-BCAT as monotherapy and in combination with pembrolizumab. The purpose of the dose expansion part of the of the study is to evaluate the antitumor activity of ALN-BCAT as monotherapy and in combination with pembrolizumab; to characterize the safety and tolerability... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/16/2025
Locations: Clinical Trial Site, Los Angeles, California
Conditions: Advanced Hepatocellular Carcinoma, Metastatic Hepatocellular Carcinoma
A Randomized, Phase 2/3 Study to Investigate the Efficacy and Safety of RP2 in Combination With Nivolumab in Immune Checkpoint Inhibitor-Naïve Adult Patients With Metastatic Uveal Melanoma
Recruiting
The purpose of this study is to measure the clinical benefits of the combination of RP2 and nivolumab as compared with the combination of nivolumab and ipilimumab in patients with metastatic uveal melanoma who have not been treated with immune checkpoint inhibitor therapy.
Gender:
ALL
Ages:
All
Trial Updated:
06/16/2025
Locations: UC San Diego Moores Cancer Center, La Jolla, California
Conditions: Metastatic Uveal Melanoma
A Study to Compare the Efficacy of Nivolumab and Relatlimab Plus Chemotherapy vs Pembrolizumab Plus Chemotherapy for Stage IV/Recurrent Non-squamous Non-small Cell Lung Cancer With PD-L1 Expression ≥ 1%
Recruiting
The purpose of this study is to compare the efficacy of Nivolumab and Relatlimab in combination with chemotherapy to Pembrolizumab with Chemotherapy in participants with stage IV or recurrent Non-squamous Non-small Cell Lung Cancer with PD-L1 expression ≥ 1%
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/16/2025
Locations: Local Institution - 0112, Los Angeles, California
Conditions: Non-small Cell Lung Cancer
An Extension and Crossover Vaccination Study on the Immune Response and Safety of a Vaccine Against Respiratory Syncytial Virus Given to Adults 60 Years of Age and Above Who Participated in RSV OA=ADJ-006 Study
Recruiting
The purpose of this study is:
* To investigate the optimal timing for revaccination after the initial RSVPreF3 OA vaccine dose,
* To evaluate the long-term immune persistence and safety up to 5 consecutive RSV seasons (approximately 60 months) of a single dose of RSVPreF3 OA vaccine,
* To give the opportunity to participants who received only placebo in the RSVOA=ADJ- 006 study, to receive a dose of the RSVPreF3 OA vaccine and collect additional safety information.
Gender:
ALL
Ages:
60 years and above
Trial Updated:
06/16/2025
Locations: GSK Investigational Site, Cerritos, California
Conditions: Respiratory Syncytial Virus Infections
1021 - 1032 of 5590
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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