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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.
2557 - 2568 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
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
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Semaglutide and Tirzepatide are advanced GLP-1 medications designed to support weight management and metabolic health. They work by targeting GLP-1 receptors in the body, helping regulate appetite, improve blood sugar control, and support sustainable weight loss (up to 22% of body weight).
Get $50 off your first order using promo code: policy-lab-50
Conditions:
Overweight
Overweight and Obesity
Obesity
Weight Loss
Morbid Obesity
Featured Trial
Birth Control Clinical Research Study
Recruiting
Living with obesity and looking for a birth control option that is right for you? Clinical trials are now enrolling women with a body mass index (BMI) of 30 or more in the area to help study a potential new progestin-only contraceptive patch. Participating in research studies can help advance birth control options. Don’t let financial stress hold you back. All study-related assessments, care, and study patch are available at no cost. You may also be reimbursed for study-related travel.
Conditions:
Obesity
Overweight
Overweight and 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
Extended Bolus for Meals in a Closed-loop System
Recruiting
This study aims to evaluate whether the use of an extended bolus will improve glucose control with high-fat high protein meals using a closed-loop system. The new knowledge gained from this study may provide a method to allow for the proper administration of insulin over an extended period to mitigate the risk of prolonged hyperglycemia or early hypoglycemia.
Gender:
ALL
Ages:
Between 13 years and 19 years
Trial Updated:
06/09/2025
Locations: University of California San Francisco, San Francisco, California
Conditions: Type 1 Diabetes
Bevacizumab Treatment For Type 1 ROP
Recruiting
Type 1 retinopathy of prematurity in zone I represents the most severe type of ROP and has the worst prognosis. It is unknown whether low-dose bevacizumab will be successful in these severe cases. Also unknown is the timing and extent of peripheral retinal vascularization after low-dose bevacizumab compared with the standard dose. The current study will evaluate whether doses of 0.063 mg and 0.25mg are effective as treatment for type 1 ROP, with ROP and retinal vessels all in zone I.
Gender:
ALL
Ages:
6 months and below
Trial Updated:
06/09/2025
Locations: Univ of California, Irvine- Gavin Herbert Eye Institute, Irvine, California
Conditions: Retinopathy of Prematurity
A Randomized Trial to Evaluate Sequential vs Simultaneous Patching
Recruiting
A randomized trial to determine whether simultaneous treatment with spectacles and patching has an equivalent VA outcome compared with sequential treatment, first with spectacles alone followed by patching (if needed), for previously untreated amblyopia in children 3 to \<13 years of age.
Gender:
ALL
Ages:
Between 3 years and 13 years
Trial Updated:
06/09/2025
Locations: Univ. of California- Berkeley, Berkeley, California
Conditions: Amblyopia
Long-term Impact of Infection With Novel Coronavirus (COVID-19)
Recruiting
LIINC is a study of volunteers who were previously infected with SARS-CoV-2 (also known as novel coronavirus or COVID-19) who have recovered from acute infection. The study is designed to provide a specimen bank of samples with carefully characterized clinical data. LIINC specimens will be used to examine multiple questions involving the virologic, immunologic, and host factors involved in COVID-19, with a focus on understanding variability in the long-term immune response between individuals.
Gender:
ALL
Ages:
Between 18 years and 100 years
Trial Updated:
06/09/2025
Locations: Zuckerberg San Francisco General Hospital (ZSFG), San Francisco, California
Conditions: COVID
Characterization of T-cell Repertoire in Patients With Acute Myeloid Leukemia Undergoing Donor Stem Cell Transplant
Recruiting
This research trial studies characterization of T-cell repertoire through next-generation sequencing in patients with acute myeloid leukemia undergoing stem cell transplant. Characterizing T-cell repertoire may help to understand if immune system plays a significant role in high risk patients with acute myeloid leukemia.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/09/2025
Locations: USC / Norris Comprehensive Cancer Center, Los Angeles, California
Conditions: Acute Myeloid Leukemia
Pharmacogenomics of Asparaginase Induced Hepatotoxicity
Recruiting
This pilot trial studies the impact of genetic information on developing liver damage caused by asparaginase in participants with newly diagnosed acute lymphoblastic leukemia. Testing saliva samples may help doctors find certain genetic markers that may predict whether participants will tolerate asparaginase, which is given as part of clinical care for acute lymphoblastic leukemia.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/09/2025
Locations: USC / Norris Comprehensive Cancer Center, Los Angeles, California
Conditions: Acute Lymphoblastic Leukemia
One-Time DNA Study for Vasculitis
Recruiting
The purpose of this study is to identify genes that increase the risk of developing vasculitis, a group of severe diseases that feature inflammation of blood vessels. Results of these studies will provide vasculitis researchers with insight into the causes of these diseases and generate new ideas for diagnostic tests and therapies, and will be of great interest to the larger communities of researchers investigating vasculitis and other autoimmune, inflammatory, and vascular diseases.
Gender:
ALL
Ages:
7 years and above
Trial Updated:
06/09/2025
Locations: Cedars-Sinai Medical Center, Los Angeles, California
Conditions: Eosinophilic Granulomatosis With Polyangiitis (Churg-Strauss), Giant Cell Arteritis, Granulomatosis With Polyangiitis (Wegener's), Microscopic Polyangiitis, Polyarteritis Nodosa, Takayasu's Arteritis
Pediatric Prehospital Airway Resuscitation Trial
Recruiting
This study is a Phase 3, multi-center, Bayesian Adaptive Sequential Platform Trial testing the effectiveness of different prehospital airway management strategies in the care of critically ill children. Emergency Medical Services (EMS) agencies affiliated with the Pediatric Emergency Care Applied Research Network (PECARN) will participate in the trial. The study interventions are strategies of prehospital airway management: \[BVM-only\], \[BVM followed by SGA\] and \[BVM followed by ETI\]. The p... Read More
Gender:
ALL
Ages:
Between 24 hours and 17 years
Trial Updated:
06/08/2025
Locations: Harbor-University of California Los Angeles Medical Center, Los Angeles, California
Conditions: Heart Arrest, Out-Of-Hospital, Wounds and Injuries, Respiratory Insufficiency in Children, Child, Only, Critical Illness
Evaluating the Effect Of Rifaximin on the Gut Microbiota and Metabolome in SIBO Using CapScan®
Recruiting
We will sample intestinal microbiota using a microbiome sampling capsule in patients with Small Intestinal Bacterial Overgrowth (SIBO)
Gender:
ALL
Ages:
Between 18 years and 80 years
Trial Updated:
06/08/2025
Locations: Silicon Valley Gastroenterology, Mountain View, California
Conditions: Small Intestinal Bacterial Overgrowth
A Study of MET233 in Individuals With Obesity or Overweight
Recruiting
The goal of this clinical trial is to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of once-weekly subcutaneous injections of MET233 in otherwise healthy adults with overweight or obesity.
The trial will be conducted in three parts. Part A consists of single ascending dose (SAD) cohorts of MET233 or placebo. Part B consists of multiple ascending dose (MAD) cohorts, with participants treated with five once-weekly doses of MET233 or placebo. In Part C, participants will... Read More
Gender:
ALL
Ages:
Between 18 years and 70 years
Trial Updated:
06/06/2025
Locations: MET233 Research Site 001, Cypress, California
Conditions: Obesity and Overweight
Phase II Trial Comparison of 3 vs 4 Fractions (BRACHY-FIT).
Recruiting
This is a prospective non-randomized clinical trial to evaluate the feasibility of 3 fraction versus a standard 4 fraction high dose rate brachytherapy regimen in patients with locally advanced cervical cancer.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
06/06/2025
Locations: Stanford University, Palo Alto, California
Conditions: Cervical Cancers
Single and Multiple Ascending Dose Study of AMG 378 in Healthy Participants
Recruiting
The main objective of the study is to assess the safety and tolerability of AMG 378 as single or multiple doses in healthy participants.
Gender:
ALL
Ages:
Between 18 years and 55 years
Trial Updated:
06/06/2025
Locations: Orange County Research Center, Lake Forest, California
Conditions: Healthy Volunteers
2557 - 2568 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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