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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.
1381 - 1392 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
DNA-guided Second Line Adjuvant Therapy for High Residual Risk, Estrogen Receptor Positive, HER-2 Negative Breast Cancer (DARE)
Recruiting
A randomized, Phase II trial of circulating tumor DNA-guided second line Adjuvant therapy for high Residual risk, Estrogen Receptor positive, HER-2 negative breast cancer (DARE)
Gender:
ALL
Ages:
All
Trial Updated:
07/29/2025
Locations: USC/Norris Comprehensive Cancer Center, Los Angeles, California
Conditions: Breast Cancer
Anesthetics and Analgesics in Children
Recruiting
The purpose of this study is to characterize the pharmacokinetic (PK) and safety profile of anesthetics and analgesics in children and adolescents.
Gender:
ALL
Ages:
Between 0 years and 17 years
Trial Updated:
07/29/2025
Locations: Lucile Packard Children's Hospital, Stanford, California
Conditions: Anesthesia, Pain
Product Performance Report: Evaluate Long-term Reliability & Performance of Medtronic Marketed Cardiac Therapy Products
Recruiting
The main purpose of the Product Performance Report (formerly referred to as System Longevity Study) is to evaluate long-term performance of Medtronic market-released cardiac rhythm products by analyzing product survival probabilities.
Gender:
ALL
Ages:
All
Trial Updated:
07/29/2025
Locations: Not set, Bakersfield, California
Conditions: Arrhythmia, Bradycardia, Heart Failure, Sinus Tachycardia
Gauging Outcomes of Total Milk Ingestion on Lipid and gControl
Recruiting
Atherosclerotic cardiovascular disease remains the leading cause of death for adults in the United States. The cardiovascular impact of milk consumption remains a matter of long-standing scientific debate. Current guidelines for Americans recommend three daily servings of fat-free or low-fat (1%) dairy over full-fat options due to concerns that saturated fat may increase cardiovascular risk. Yet, the literature does not consistently support non-fat dairy as superior to high-fat dairy for reducin... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/28/2025
Locations: UCSF Medical Center at Parnassus, San Francisco, California
Conditions: Heart Diseases, Cardiovascular Disease
ATI-045 Versus Placebo in Patients With Moderate-to-Severe Atopic Dermatitis
Recruiting
This study evaluates ATI-045 versus placebo in patients with Moderate-to-Severe Atopic Dermatitis.
Gender:
ALL
Ages:
Between 18 years and 70 years
Trial Updated:
07/28/2025
Locations: Aclaris Study Site, Encinitas, California
Digitally Rendered Interventions And Knowledge To Limit Ethanol-Associated Atrial Fibrillation Severity
Recruiting
Per the 2021 National Survey on Drug Use and Health administered by the U.S. Department of Health and Human Services, 85% of all American adults consume alcohol. Atrial fibrillation (AF) is the most common arrhythmia, affecting more than 10 million individuals in U.S., comprising 4.5% of the adult population. Although alcohol abstinence clearly reduces AF in heavy drinkers, observational data comparing the health effects of limited consumption versus abstention are conflicting.
The Mediterranea... Read More
Gender:
ALL
Ages:
21 years and above
Trial Updated:
07/28/2025
Locations: UCSF Medical Center at Parnassus, San Francisco, California
Conditions: Atrial Fibrillation (AF)
Evaluation of Enhanced Lithotripsy System (ELS) in the Treatment of Urinary Stones, A Pivotal Trial
Recruiting
The purpose of this study is to evaluate the safety and performance of the ELS to treat urinary stones. The ELS is intended to break urinary stones into small fragments that can pass during or after the procedure with less or no discomfort. Eligible patients are male or females, age 21 or older, with a single urinary stone in the ureter. Participants will undergo the ELS procedure and then be evaluated 30 days later for the presence or absence of urinary stone fragments on a CT scan. Other outco... Read More
Gender:
ALL
Ages:
21 years and above
Trial Updated:
07/28/2025
Locations: Michael G. Oefelein Clinical Trials, Bakersfield, California
Conditions: Kidney Calculi; Ureteral Calculi
A Study to Evaluate Efficacy of Remibrutinib Compared to Dupilumab at Early Timepoints in Adults With Chronic Spontaneous Urticaria Inadequately Controlled by Second Generation H1-antihistamines
Recruiting
This is a US, multi-center, randomized, double-blind, double-dummy, Phase 3b study to evaluate efficacy of remibrutinib (25 mg twice daily \[b.i.d.\] by mouth \[p.o.\]) compared to dupilumab (600 mg loading dose administered subcutaneously (s.c.) followed by 300 mg every 2 weeks s.c.) at early timepoints (4 weeks and earlier), when administered as an add-on treatment to second generation H1-antihistamines (sgH1-AH) (standard label dose as background therapy) in adult US participants with moderat... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/28/2025
Locations: Ctr for Dermatology Clinical Res, Fremont, California
Conditions: Chronic Spontaneous Urticaria (CSU)
A Study of Retatrutide (LY3437943) in the Maintenance of Weight Reduction in Individuals With Obesity
Recruiting
This is a study of retatrutide in participants with obesity. The main purpose is to learn more about how retatrutide maintains body weight loss. The study will have two treatment phases: an 80 week lead-in phase in which all participants will take retatrutide dose 1 and a 36 week randomized, double-blinded phase in which participants will either take retatrutide dose 1, retatrutide dose 2, or switch to placebo. Participation in the study will last around 125 weeks.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/28/2025
Locations: Southern California Clinical Research, Santa Ana, California
Conditions: Obesity
A Phase 3 Study to Assess Efficacy Safety and Tolerability of Remibrutinib in Adult Patients With Moderate to Severe Hidradenitis Suppurativa
Recruiting
The purpose of this study is to establish the efficacy, safety, and tolerability of remibrutinib (LOU064) Dose A and Dose B compared to placebo in participants with moderate to severe hidradenitis suppurativa (HS).
Gender:
ALL
Ages:
Between 18 years and 100 years
Trial Updated:
07/28/2025
Locations: Cheryl Effron MD Inc, Anaheim, California
Conditions: Hidradenitis Suppurativa
SLV-154 Treatment of Metastatic Solid Tumors
Recruiting
This is a Phase 1 dose-escalation study evaluating the safety, pharmacokinetics, pharmacodynamics, immunogenicity, and efficacy of SLV-154 across a range of dose levels when administered to subjects with metastatic solid tumors.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/28/2025
Locations: Hoag Memorial Hospital Presbyterian, Newport Beach, California
Conditions: Squamous Cell Cancer of Head and Neck (SCCHN), NSCLC, SCLC, Cervical Cancer Metastatic, Breast Cancer Metastatic, Endometrial Cancer, Ovarian Cancer, Urothelial Cancer, Sarcoma, Thyroid Cancer
Long-Term, Open-label Study of Oral Deucrictibant Extended-Release Tablet for Prophylaxis Against Angioedema Attacks in Adolescents and Adults With HAE
Recruiting
This is a Phase 3, multicenter, long-term, open-label study to evaluate the safety and efficacy of once-daily orally administered deucrictibant extended-release tablet for prophylaxis to prevent angioedema attacks in participants aged ≥12 years with Hereditary Angioedema
Gender:
ALL
Ages:
12 years and above
Trial Updated:
07/28/2025
Locations: Study Site, Santa Monica, California
Conditions: Hereditary Angioedema (HAE)
1381 - 1392 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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