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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.
1501 - 1512 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
AMT-260 Gene Therapy Study in Adults With Unilateral Refractory Mesial Temporal Lobe Epilepsy
Recruiting
The main goals of this clinical study are to learn if AMT-260 is safe and tolerable and works to reduce the frequency of seizures in adults with unilateral mesial temporal lobe epilepsy (MTLE).
Gender:
ALL
Ages:
Between 18 years and 65 years
Trial Updated:
07/24/2025
Locations: Stanford University, Palo Alto, California
Conditions: Mesial Temporal Lobe Epilepsy
Safety and Efficacy of OBX-115 in Advanced Solid Tumors
Recruiting
This is a study to investigate the safety and efficacy of an investigational OBX-115 regimen in adult participants with advanced solid tumors.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/24/2025
Locations: The Angeles Clinic and Research Institute (Melanoma), Los Angeles, California
Conditions: Tumor Skin, Metastatic Melanoma, Melanoma, Lung Cancer, Metastatic Lung Cancer, Non Small Cell Lung Cancer, Metastatic Non Small Cell Lung Cancer
Probiotic Intervention Study
Recruiting
The current standard of care for obesity is the optimal management of comorbid conditions such as diabetes and hyperlipidemia, and counseling on diet, weight loss, or increased physical activity programs. However, lifestyle, diet, and behavioral interventions may provide between 7-10% reduction in initial weight and even fewer with long-term weight loss. In severely obese patients (BMI\>40 or BMI\>35 with comorbidities), bariatric surgery is also a potential treatment, but there is a high barrie... Read More
Gender:
ALL
Ages:
Between 18 years and 50 years
Trial Updated:
07/24/2025
Locations: University of California, Los Angeles, California
Conditions: Obesity, Food Addiction
Patient Derived Vascularized MicroTumor Model of Gastrointestinal Peritoneal Carcinomatosis
Recruiting
This is a pilot study gathering and using samples and data from patients with gastrointestinal peritoneal carcinomatosis. Participants will be asked for permission to provide blood and ascites/peritoneal wash fluid, tumor samples during their planned surgical procedure.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/24/2025
Locations: Chao Family Comprehensive Cancer Center, University of California, Irvine, Orange, California
Conditions: Peritoneal Carcinomatosis, Gastrointestinal Peritoneal Carcinomatosis
Safety and Efficacy Study of VNX001 Compared to Its Individual Components (Lidocaine and Heparin) or Placebo in Subjects With IC/BPS
Recruiting
This is a Phase 2, prospective, randomized, double-blind, placebo-controlled, multi-center, single-dose, pharmacodynamic study designed to evaluate the efficacy and safety of the combination product (VNX001) versus placebo and its individual components (heparin sodium and lidocaine hydrochloride (HCl)) for the reduction of bladder pain in patients with interstitial cystitis (IC) / bladder pain syndrome (BPS), Who Have an Episode of Acute Bladder Pain of Moderate to Severe Intensity.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/24/2025
Locations: IC Study LLC, Escondido, California
Conditions: Interstitial Cystitis, Bladder Pain Syndrome
A Trial to Learn How Well Linvoseltamab Works Compared to the Combination of Elotuzumab, Pomalidomide and Dexamethasone for Adult Participants With Relapsed/Refractory Multiple Myeloma
Recruiting
This study is researching an experimental drug called linvoseltamab, also called REGN5458.
Linvoseltamab has previously been studied by itself (without other cancer drugs) in participants who had advanced multiple myeloma that returned and needed to be treated again after many other therapies had failed. These participants were no longer benefiting from standard medications and had no good treatment options. In that study, some participants who were treated with linvoseltamab had improvement of... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/24/2025
Locations: University of California Los Angeles (UCLA), Los Angeles, California
Conditions: Relapsed Refractory Multiple Myeloma (RRMM)
Assess the Safety and Efficacy of Sovateltide in Patients With Acute Cerebral Ischemic Stroke
Recruiting
Extensive research is being conducted in search of neuroprotective agents for possible use in the acute phase of stroke and agents that can be used for neurorepair in later stages of stroke. Several trials have been conducted and are in progress using different pharmacological agents, but none of the studies involve the stimulation of ETB receptors to treat cerebral ischemic stroke. Sovateltide (IRL-1620, PMZ-1620) has been effective in animal models of cerebral ischemic stroke. Its safety and t... Read More
Gender:
ALL
Ages:
Between 18 years and 80 years
Trial Updated:
07/24/2025
Locations: St. John's Regional Medical Center, Oxnard, California
Conditions: Acute Ischemic Stroke, Cerebral Stroke
A PiLot ClinicaL TrIal of ParicAlcitol for ChroNiC PancrEatitis
Recruiting
The purpose of this pilot study to examine the feasibility and acceptability of paricalcitol in adults with Chronic Pancreatitis (CP).
Gender:
ALL
Ages:
Between 18 years and 75 years
Trial Updated:
07/24/2025
Locations: Cedars-Sinai Medical Center, Los Angeles, California
Conditions: Chronic Pancreatitis
ExoLuminate Study for Early Detection of Pancreatic Cancer
Recruiting
ExoLuminate is a nationally-enrolling registry study designed for earlier detection of cancer in patients at elevated risk or clinically-suspicious for pancreatic ductal adenocarcinoma (PDAC).
Those with elevated risk for PDAC can include individuals with intraductal papillary mucinous neoplasms, family history of pancreatic cancer, germline mutations in genes known to be associated with cancer, and a personal or family history of pancreatitis.
The goal of the study is to compare the performan... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/24/2025
Locations: Biological Dynamics, San Diego, California
Conditions: Pancreas Cancer, Exosomes, Extracellular Vesicles, Pancreatic Neoplasms
Frespaciguat (MK-5475) INSIGNIA-PH-COPD: A Study of the Efficacy and Safety of Frespaciguat (an Inhaled sGC Stimulator) in Adults With PH-COPD
Recruiting
Researchers are looking for ways to treat pulmonary hypertension (PH) caused by chronic obstructive pulmonary disease (COPD). The goal of the study is to learn if people who take frespaciguat can walk farther in 6 minutes at Week 24 compared to people who take placebo.
Gender:
ALL
Ages:
Between 40 years and 85 years
Trial Updated:
07/24/2025
Locations: UCSF Helen Diller Medical Center at Parnassus Heights ( Site 0110), San Francisco, California
Conditions: Pulmonary Hypertension, Chronic Obstructive Pulmonary Disease
Regeneron AA Multicenter (Dupilumab)
Recruiting
This is a prospective, randomized, double blind, placebo-controlled clinical trial. The study will take place at 4 sites. This trial will enroll a total of 68 patients with moderate to severe AA (affecting more than 50% of the scalp) at the time of screening with a targeted 54 subjects completers through Week 48. AA subjects must have evidence of hair regrowth within the last 7 years of their last episode of hair loss; and have screening IgE ≥ 200 and/or have personal and/or familial history of... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/24/2025
Locations: University of California, Irvine, Irvine, California
Conditions: Alopecia Areata
Writing About Experiences and Health in Older Adults II
Recruiting
UCLA researchers looking for healthy older adults (aged 65+) to participate in a study investigating how writing about experiences can affect your brain and body.
Once a week for 6 weeks, participants will write about their experiences and fill out online questionnaires. Participants will also come to the UCLA campus to complete a neuroimaging session (fMRI), provide a blood spot sample, and fill out questionnaires 2 times: once prior to the 6-week writing period and once immediately after the... Read More
Gender:
ALL
Ages:
65 years and above
Trial Updated:
07/24/2025
Locations: Center for Cognitive Neuroscience, Los Angeles, California
Conditions: Social Psychology
1501 - 1512 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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