Clinical trials · California
Health clinical trials in California
We’re tracking 342 recruiting health studies with a site in California, each written for real people, not researchers.
Recruiting studies in California
- NCT06800833Recruiting
Mango or cookie study for gut, mental, sexual, and skin health
This study is testing whether eating mangoes or low-fat cookies every day for 4 weeks can improve your gut health, and in turn affect your mood, sex life, and skin. If you are generally healthy, not pregnant, and not taking certain medications or supplements, you may be able to join.
San Diego, CaliforniaAges 18–50 - NCT05718245Recruiting
HEPA air filters to improve heart and blood sugar health
This study looks at whether using HEPA air filters and monitoring indoor air can improve heart-related health and blood sugar/metabolic health in older adults. You may be eligible if you live in Los Angeles County, don’t smoke, and meet the health and home requirements.
Los Angeles, CaliforniaAges 65–84 - NCT06586151Recruiting
HIV prevention program for gender-diverse teens
This study tests a text-message program to help prevent HIV in teens who are transgender, non-binary, or gender-diverse. It aims to see if the program can support healthy choices and reduce risk.
San Clemente, CaliforniaAges 14–18 - NCT06568016Recruiting
Helping patients get colonoscopy after abnormal stool test
This study tests a new clinic program to help patients complete a colonoscopy if they received an abnormal result from a fecal immunochemical test (FIT), a simple stool test for colon cancer. It focuses on community health centers and aims to make follow-up care easier.
Los Angeles, CaliforniaAges Any age - NCT06544954Recruiting
Grape study for heart and gut health in overweight women
This study tests whether eating California grapes can improve gut health and heart health in overweight or obese women who have been through menopause and may have type 2 diabetes or metabolic syndrome. You would need to eat grapes daily and provide blood and stool samples.
Davis, CaliforniaAges 45–70 - NCT06456372Recruiting
App for kids with ADHD
This study tests a smartphone app designed to help children with ADHD manage their symptoms. Researchers want to see if using the app can improve focus and daily functioning.
Irvine, CaliforniaAges 8–12 - NCT06436560Enrolling by invitation
Support for transgender and non-binary people seeking vaginoplasty
This study tests a virtual peer support program for transgender and non-binary people who are planning to have vaginoplasty. It aims to see if talking with a trained peer can help with the process.
San Francisco, CaliforniaAges 18 years+ - NCT06427954Recruiting
Mobile app study for people with advanced lung cancer
This study tests a mobile app (called THRIVE) to help people with advanced lung cancer manage their health and well-being. You'll use the app on your phone to track symptoms and get support, which may help you feel better and stay more in control.
Los Angeles, CaliforniaAges 18 years+ - NCT06386198Recruiting
Health Advocate for Young Liver Transplant Patients
This study tests a program that helps young adults with a liver transplant prepare to move from a children’s hospital to an adult hospital. It aims to provide extra support for people who also have social needs like trouble getting enough food.
San Francisco, CaliforniaAges 18–25 - NCT06374238Recruiting
Peer support for young people with sickle cell pain
This study tests whether having a peer mentor who also has sickle cell disease can help young people manage chronic pain. You would use a mobile app to connect with your mentor and track your pain.
Los Angeles, CaliforniaAges 16–39 - NCT06272045Recruiting
Early heart health support for moms and babies
This study tests a program that helps pregnant women in home visiting take care of their heart health and their baby's health. It is available to women who are pregnant or just had a baby and are in a participating home visiting program.
San Luis Obispo, CaliforniaAges 18 years+ - NCT06090578Recruiting
Brain health check for adults in primary care
This trial tests a new brain health assessment tool in primary care clinics. It may help your doctor better detect thinking or memory changes early.
Pasadena, CaliforniaAges 18 years+ - NCT05978128Recruiting
Use advocates to boost lung cancer screening
This trial tests whether trained advocates and supporters can help people who are eligible for lung cancer screening actually get screened. It may help you (and others) by making screening easier to plan and complete.
Los Angeles, CaliforniaAges 40–80 - NCT06067763Enrolling by invitation
Project Health: Preventing unhealthy weight gain in young adults
This study tests a program to help young adults improve their eating and exercise habits, with the goal of preventing obesity. It is designed for people who are concerned about their weight and want to make healthier lifestyle choices.
Stanford, CaliforniaAges 17–20 - NCT05956756Recruiting
Resilience training for occupational therapy students
This trial offers a resilience (stress-coping) program to occupational therapy students. It may help improve how students handle stress during their training.
Loma Linda, CaliforniaAges 18–65 - NCT05705531Recruiting
Cardiac MRI study of heart health after Hodgkin lymphoma treatment
This study looks at how certain blood-related “growth patterns” connect to long-term heart health after treatment for classical Hodgkin lymphoma. It may help doctors better predict who could develop heart problems and how to monitor them over time.
Duarte, CaliforniaAges 7 years+ - NCT05701657Recruiting
Food and lifestyle study using your health and DNA data
This study tests whether changing diet and tracking health habits can help personalize nutrition using your DNA and health information. You would follow a structured diet for about 10–12 weeks and possibly spend short stays where you eat only study-provided foods.
Davis, CaliforniaAges 18 years+ - NCT05279729Recruiting
Mobile app coaching for people with diabetes
This study tests whether using a smartphone app can help people with type 2 diabetes manage their health. It focuses especially on low-income Hispanic/Latinx adults who regularly check blood sugar.
San Diego, CaliforniaAges 18–64 - NCT04997473Recruiting
Mobile app weight-loss program for young transplant patients
This trial tests whether a phone app can help young people who previously had a stem cell transplant lose weight. It’s designed for people who are at least 100 days out from transplant and who meet weight criteria.
Los Angeles, CaliforniaAges 13–30 - NCT04404465Enrolling by invitation
Test blood/heart signals to understand atrial fibrillation changes
This study looks at early changes in the heart related to atrial fibrillation (AF) using health data and biomarkers. It aims to find better ways to predict or understand AF, especially around procedures like ablation or cardioversion.
San Francisco, CaliforniaAges 18 years+ - NCT07877246Recruiting
Immune markers in brain-related illness
This study looks at blood and other samples from people with brain-related conditions that might involve inflammation or infection. It aims to find immune markers that could help understand these illnesses better.
Los Angeles, CaliforniaAges 1 month–100 years - NCT05229341Recruiting
Testing DNA “methylation” to evaluate thyroid nodule samples
This study looks at patient tissue from needle biopsies to see if DNA “methylation” patterns can help diagnose and guide treatment for thyroid nodules. You might benefit by helping improve how these nodules are evaluated, using information from your biopsy sample and medical data.
Duarte, CaliforniaAges 18 years+ - NCT07741968Recruiting
Online program to ease fear of cancer returning
This study tests an online program designed to help women with advanced or certain types of breast or gynecologic cancer manage their fear of the disease progressing or returning. The program aims to reduce anxiety and improve quality of life.
Arcadia, CaliforniaAges 18 years+ - NCT04775355Recruiting
Track urine and gut changes during prostate cancer treatment
This study looks at how your urine and gut (intestine) microbes change while you undergo prostate cancer treatments, including hormone therapy (androgen deprivation) and/or radiation. The goal is to better understand these biological changes, which may help improve future treatment planning.
Duarte, CaliforniaAges 18 years+
Where these studies are running in California
Institutions with a site for the recruiting health studies listed above.
- City of Hope · 4 studies
- University of California, San Francisco · 3 studies
- San Diego State University · 2 studies
- UCLA Jonsson Comprehensive Cancer Center · 2 studies
- University of California, Los Angeles · 2 studies
- California Polytechnic State University
- Cedars Sinai Medical Center
- Center for Innovative Public Health Research
What taking part in a health study involves
A screening visit first
Before anything else, the study team checks whether you fit — usually a visit with some tests. You can stop at any point, and screening is typically free.
Care at a nearby site
Study visits happen at a clinic or hospital taking part. Many studies cover the cost of the study treatment and related visits, and some reimburse travel.
You stay in control
Taking part is voluntary and you can leave a study at any time, for any reason, without affecting your regular care.
The team decides eligibility
Our fit check is a helpful first read, not a decision. The study team makes the final call after reviewing your health history.
Common questions
- Are there health clinical trials in California?
- Yes. We're currently tracking 342 recruiting health studies with a site in California, each rewritten in plain language so you can see what it's testing and who it's for.
- How do I find out if I qualify for a health study in California?
- Each study lists its eligibility rules — age, diagnosis, prior treatments. On every trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Do I have to live in California to take part?
- Not necessarily. These studies have a site in California, but eligibility is about your health, not your address — some people travel to take part, and a few studies reimburse travel. The study team can tell you what's required.
- Does it cost anything to join a health trial?
- Using Clin2 is always free. Many trials cover the study treatment and related visits; some reimburse travel. The study team explains exactly what's covered before you decide.
Not the right time?
New health studies open in California regularly. Set up a health profile and we’ll quietly watch for studies that fit you and email you when one opens.
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.