Clinical trials · California
Health clinical trials in California
We’re tracking 345 recruiting health studies with a site in California — including Phase 2 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT07653776Recruiting
Study of wellness products for gut health
This study tests whether certain daily wellness products can improve gut-related quality of life. If you have room to feel better and are willing to take a product without knowing if it's active or a placebo, you may be able to join.
Del Mar, CaliforniaAges 21–105 - NCT06712147Recruiting
MHE3: health study for Hispanic residents
This study tests ways to help Hispanic/Latino families overcome health obstacles. You may join if you live in certain San Jose zip codes.
Palo Alto, CaliforniaAges 18–65 - NCT07261254Recruiting
Baby Bonus: Support for families with newborns
This study tests if providing monthly payments and support to new parents can improve the health and well-being of their babies. If you live in San Mateo County and your baby is healthy and on Medicaid, you might be able to join.
Palo Alto, CaliforniaAges birth+ - NCT07713810Recruiting
Can supplements help with constipation? A study on health products
This study tests if certain health and wellness products can improve constipation and related health issues. It compares the active product to a placebo (a dummy product without active ingredients) to see if it really works.
Del Mar, CaliforniaAges 21–105 - NCT07563855Recruiting
Testing a Wellness Product for Digestive Health
This study tests whether a PepsiCo health and wellness product can improve digestive and overall health. You'll take the product daily for 4 weeks and provide blood and stool samples to help researchers understand how it affects your body.
Del Mar, CaliforniaAges 21–75 - NCT05846282Recruiting
Student program to reduce mental health strain of resilience
This study is looking at ways to reduce the mental health and health burdens some students carry while trying to be “resilient.” It is for certain high school students in specific grades and backgrounds, to see if the program can help them feel better.
Los Angeles, CaliforniaAges 13 years+ - NCT06525064Recruiting
Health-E You app study for teen guys
This study tests a health app designed for teen guys who have had vaginal or anal sex. It aims to see if the app can help with sexual health decisions and education.
Oakland, CaliforniaAges 13–21 - NCT06842576Recruiting
Video to help teens get ready for adult healthcare
This study is testing a short video to help teens prepare for moving from pediatric to adult healthcare. It aims to see if the video makes teens feel more ready for this transition.
Los Angeles, CaliforniaAges 12–17 - NCT07421596Recruiting
Dietary supplement study for gut and digestive health
This trial tests whether a dietary supplement system can improve gut and digestive health over 8 weeks. You may be eligible if you have digestive symptoms like bloating, stomach pain, or diarrhea.
San Francisco, CaliforniaAges 18–80 - NCT07215689Recruiting
Ashwagandha for healthier skin and hair
This trial tests a daily 300 mg ashwagandha supplement (KSM-66) to see if it improves skin and hair health over three months. It is for generally healthy adults experiencing mild to moderate hair loss.
San Francisco, CaliforniaAges 18–60 - NCT07546604Enrolling by invitation
Game-like app to prevent alcohol and mental health risks in women
This trial tests a smartphone app designed to help women prevent alcohol misuse and mental health problems. You play games in the app to build healthy habits.
Los Angeles, CaliforniaAges 18–69 - NCT07339228Enrolling by invitation
Youth soccer and mental health study
This trial combines soccer with behavioral health support to help young people ages 14–21. It tests if joining team sports and group activities improves mental well-being.
Oakland, CaliforniaAges 14–21 - NCT06574113Recruiting
Testing a new blood pressure patch without a cuff
This study tests a wearable patch that measures blood pressure without needing an inflatable arm cuff. It could make monitoring easier and more comfortable.
Woodland Hills, CaliforniaAges 18 years+ - NCT05570734Recruiting
Study of diabetes support for Hispanic/Latino adults online
This study looks at an online (e-health) way to help adults with type 2 diabetes better follow their diabetes care plan. It targets Hispanic/Latino patients and may help improve how consistently people manage their diabetes.
Chula Vista, CaliforniaAges 18 years+ - NCT05589155Recruiting
Using a phone app to improve blood sugar and weight
This study looks at whether a mobile phone app can help people with type 2 diabetes improve their health habits, including blood sugar monitoring and weight. You may be able to join if you already check your blood sugar daily and are able to use a smartphone.
San Diego, CaliforniaAges 18–64 - NCT05984589Recruiting
Health coaching for colorectal cancer survivors
This study tests a personalized health coaching program for people who have had colorectal or other gastrointestinal cancer. It helps you work on lifestyle habits like diet, exercise, and alcohol use to improve your health.
Los Angeles, CaliforniaAges 18 years+ - NCT06230367Recruiting
Text program for HIV prevention for young guys who like guys
This trial tests a text-messaging program to help young guys who have sex with guys stay HIV-negative. It's designed for teens and young adults who own a cell phone and can take a quick HIV test at home.
San Clemente, CaliforniaAges 13–22 - NCT06680700Recruiting
Testing a new health patch for oxygen levels
This trial tests a new patch that measures oxygen in your blood. Healthy volunteers wear the patch while their oxygen levels are briefly lowered in a controlled way to see how well the patch works.
Woodland Hills, CaliforniaAges 18–50 - NCT06897982Recruiting
Nutrition program for prediabetes at health center
This study tests a nutrition program for people with prediabetes at a health center. It aims to see if the program is practical and can help prevent type 2 diabetes.
Los Angeles, CaliforniaAges 18–99 - NCT06131723Enrolling by invitation
UCLA Health email reminders for overdue health screenings
This study sends friendly email reminders to UCLA Health patients who have overdue health screenings or tests, like mammograms or blood work. It aims to help you stay on top of your health.
Los Angeles, CaliforniaAges 18 years+ - NCT07225855Recruiting
Support for older adults with head and neck cancer and their caregivers
This trial tests whether a special geriatric assessment (a check-up for older adults) and extra support can help people aged 60+ with head and neck cancer feel better during chemotherapy and radiation. It also looks at how this helps their family or friend caregivers.
Duarte, CaliforniaAges 18 years+ - NCT07744997Recruiting
Wellness product for better sleep and health
This study tests a health and wellness product for improving sleep and related health outcomes. It is a blinded study, meaning neither you nor the researchers will know if you receive the active product or a placebo until the study ends.
Del Mar, CaliforniaAges 21–105 - NCT07202247RecruitingPhase 2
Improving heart health in prostate cancer patients on hormone therapy
This study tests whether combining a time-restricted eating plan, a heart-healthy diet, and a weight-loss medication (GLP-1 receptor agonist) can help improve heart health and weight in men with prostate cancer who are receiving hormone therapy. It aims to reduce the risk of heart problems caused by hormone treatment.
Duarte, CaliforniaAges 30–79 - 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
Where these studies are running in California
Institutions with a site for the recruiting health studies listed above.
- Radicle Science Inc. · 4 studies
- Cedars-Sinai Medical Center · 2 studies
- City of Hope Comprehensive Cancer Center · 2 studies
- Perin Health Devices · 2 studies
- San Francisco Research Institute · 2 studies
- University of California, Los Angeles (UCLA) · 2 studies
- Center for Innovative Public Health Research
- Children's Hospital Los Angeles
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 345 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.