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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.
925 - 936 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
Norris ORIEN Total Cancer Care
Recruiting
This research trial collects biological samples and clinical information to create a repository of data from patients with cancer or a predisposition for cancer. Combining genetic information from biological samples and clinical data may lead to more knowledge about why certain cancers respond to treatment and help create more personalized medicine.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
08/07/2025
Locations: USC / Norris Comprehensive Cancer Center, Los Angeles, California
Conditions: Cancer Risk, Malignant Neoplasm
Core Biopsies for Establishing a Breast Tumor Tissue Repository
Recruiting
This research trial establishes a breast tumor tissue repository from core biopsies. Collecting breast tissue from core biopsies may allow doctors to learn more about the biology of breast cancer and to analyze proteins, genes, and other components of tumor cells. It may also allow doctors to conduct future studies to help understand how breast cancer grows and how it responds to different types of therapy. This will help doctors develop better breast cancer therapies and better tests to help ma... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
08/07/2025
Locations: USC Norris Comprehensive Cancer Center, Los Angeles, California
Conditions: Breast Cancer
Fabry Disease Registry & Pregnancy Sub-registry
Recruiting
The Fabry Registry is an ongoing, international multi-center, strictly observational program that tracks the routine clinical outcomes for patients with Fabry disease, irrespective of treatment status. No experimental intervention is involved; patients in the Registry undergo clinical assessments and receive care as determined by the patient's treating physician.
The primary objectives of the Registry are:
* To enhance the understanding of the variability, progression, and natural history of F... Read More
Gender:
ALL
Ages:
All
Trial Updated:
08/07/2025
Locations: University of California at Irvine- Site Number : 840036, Irvine, California
Conditions: Fabry Disease
Biological Drivers of Cervical Cancer and Side Effects From Radiation Therapy
Recruiting
The goal of this observational study is to learn more about the biology of cervical cancer in women who receive radiation therapy for this condition. The main question it aims to answer is:
Does radiation therapy alter the expression of tissue factor and other molecules in cervical cancer over time?
Participants already scheduled for radiation therapy for cervical cancer as part of their regular medical care will provide blood and biopsies of cervical cancer or of the upper portion of the vagi... Read More
Gender:
FEMALE
Ages:
18 years and above
Trial Updated:
08/06/2025
Locations: University of California San Diego, La Jolla, California
Conditions: Cervical Cancer
Study to Evaluate the Safety, Pharmacology and Efficacy of WIN378 in Adults With Moderate or Severe Asthma
Recruiting
This study is trying to identify the right dose of a long-acting medicine called WIN378 for people with moderate or severe asthma. WIN378 blocks the action of a protein called TSLP which causes inflammation in the lung and may contribute to your asthma control and symptoms. The study will test how doses of WIN378 are handled by your body (pharmacokinetics) and assess the safety of the medicine and will assess markers of asthma inflammation in your breath and in your blood, lung function and asth... Read More
Gender:
ALL
Ages:
Between 18 years and 75 years
Trial Updated:
08/06/2025
Locations: WB Contracted Clinical Research Site, Los Angeles, California
Conditions: Asthma (Diagnosis)
NBI-1117568-SCZ3032: Long-Term Evaluation of NBI-1117568 in Adults With Schizophrenia
Recruiting
This study will evaluate the long-term safety of NBI-1117568 in adults with schizophrenia.
Gender:
ALL
Ages:
Between 18 years and 65 years
Trial Updated:
08/06/2025
Locations: Neurocrine Clinical Site, Pico Rivera, California
Conditions: Schizophrenia
HOPE Intervention for Fitness
Recruiting
We will test the HOPE intervention on changing behavior of people to exercise more (take more steps each day).
Gender:
ALL
Ages:
18 years and above
Trial Updated:
08/06/2025
Locations: UC Irvine, Irvine, California
Conditions: Diabetes Mellitus Type 2
A Research Study on How a Dose of NNC0662-0419 Works in Japanese, Chinese and Non-Asian Participants Living With Overweight or Obesity
Recruiting
The study is testing the new medicine NNC0662-0419 in people living with overweight or obesity. The purpose of the study is to look into the amount of the new medicine NNC0662-0419 in participants blood after one dose. And also look into how safe and how well the study medicine is tolerated in people living with overweight or obesity. NNC0662-0419 is a new medicine which cannot be prescribed by doctors. NNC0662-0419 is currently being tested in humans and the dose participants will receive has b... Read More
Gender:
ALL
Ages:
Between 18 years and 55 years
Trial Updated:
08/06/2025
Locations: Altasciences Clinical LA, Inc., Cypress, California
Conditions: Overweight, Obesity
Developing a Digital Aid to Improve ICD Decisions
Recruiting
Advanced heart failure, affecting 7 million Americans, has multiple causes and results in greatly increased risk of disability and death. A major problem is sudden cardiac death, when the damaged heart develops an abnormal pattern of electrical conduction that can result in cessation of heart activity. While placement of an Implantable Cardioverter-Defibrillator (ICD) in a patient's chest can help prevent sudden cardiac death, these devices have several important downsides. This protocol focuses... Read More
Gender:
ALL
Ages:
60 years and above
Trial Updated:
08/06/2025
Locations: University of California, San Francisco, San Francisco, California
Conditions: Heart Failure and Reduced Ejection Fraction
A Study to Investigate Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of AZD4954 in Healthy Adult Participants With or Without Elevated Lipoprotein (a) (Lp[a]) Levels
Recruiting
The purpose of the study is to evaluate the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of single and multiple ascending doses of AZD4954 in healthy participants with or without elevated Lipoprotein(a) (Lp\[a\]) levels.
Gender:
ALL
Ages:
Between 18 years and 55 years
Trial Updated:
08/06/2025
Locations: Research Site, Glendale, California
Conditions: Healthy Participants
A Study to Assess the Safety and Efficacy of Oral LPCN 1154A in Women With Severe PPD
Recruiting
The purpose of this research study is to test the study drug, LPCN 1154A, as a possible treatment for postpartum depression (PPD). The trial aims to determine:
* If LPCN 1154A reduces depressive symptoms in subjects with severe PPD
* How well LPCN 1154A is tolerated and what side effects it may cause
* If LPCN 1154A reduces anxiety symptoms in subjects with severe PPD
Gender:
FEMALE
Ages:
Between 15 years and 45 years
Trial Updated:
08/06/2025
Locations: Advanced Research Center, Anahiem, California
Conditions: Depression, Postpartum, Depression, Post-Partum, Postpartum Depression (PPD), Post-Natal Depression, Peripartum Depression, Postnatal Depression
Comparative Effectiveness of Migraine Preventive Medications: The APT Comparison Study
Recruiting
This goal of this study is to compare three medications used for migraine preventive treatment.
This study will compare atogepant, a newer migraine preventive medication, with two older preventive medications, topiramate and propranolol. It will be determined if one works better and is more tolerable than the others.
Research participants will:
* Be randomly assigned to one of the three medications.
* Provide information about their migraine pattern using a daily headache diary and during res... Read More
Gender:
ALL
Ages:
Between 18 years and 70 years
Trial Updated:
08/06/2025
Locations: USC Keck, Los Angeles, California
Conditions: Migraine
925 - 936 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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