Clinical trials · California
Health clinical trials in California
We’re tracking 342 recruiting health studies with a site in California — including Phase 2, Phase 3 and Phase 4 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT07524946RecruitingPhase 4
Safety and effectiveness of Cabtreo for moderate to severe acne
This study tests a new acne treatment called Cabtreo in children and young teens ages 9–11. The treatment combines three ingredients to reduce acne bumps and spots on the face and body.
Manhattan Beach, CaliforniaAges 9–11 - NCT07524218Recruiting
Meal Timing During Cancer Treatment Recovery
This study looks at how the timing of meals during cancer treatment recovery affects how well you tolerate and respond to your therapy. Researchers want to learn whether eating during certain hours of the day might help your body handle chemotherapy, targeted drugs, or immunotherapy better.
Los Angeles, CaliforniaAges 18 years+ - NCT07511088Recruiting
Study of a supplement for mild stress in healthy adults
This study tests a dietary supplement for people who experience mild stress or anxiety at least once a week. You will fill out surveys on your phone or computer to see if the supplement helps you feel calmer.
San Francisco, CaliforniaAges 18–60 - NCT07499544RecruitingPhase 3
Testing Libevitug for chronic hepatitis D
This study tests a new drug, Libevitug, for people with chronic hepatitis D (HDV). It aims to see if the drug can help control the virus and improve liver health.
Garden Grove, CaliforniaAges 12–70 - NCT07475702Recruiting
Brothers of the Moon and Sun: A prevention program for Latino men
This study tests a community program called Hermanos de Luna y Sol (Brothers of the Moon and Sun) designed to lower HIV risk and support Latino men who have sex with men. If you join, you'll take part in group sessions and activities in Spanish to build health and connection.
San Francisco, CaliforniaAges 18 years+ - NCT07461948RecruitingPhase 3
Advanced imaging study for glioblastoma patients
This trial uses special MRI scans and a contrast agent to look at the immune environment of glioblastoma tumors. It may help doctors learn more about how the tumor responds to treatment.
Los Angeles, CaliforniaAges 18 years+ - NCT05553743Recruiting
Study of donated breast milk and how it affects child health
This study looks at breast milk donated for research and how it may relate to infant and child health. If you’re an adult who is breastfeeding and can donate extra milk, you may be able to participate.
San Diego, CaliforniaAges 18 years+ - NCT07441083Recruiting
Shatavari root extract for women's sexual wellness
This trial tests if a herbal supplement called Shatavari can help improve sexual desire and function in women who feel stressed. You would take the supplement daily and report how you feel over several weeks.
San Francisco, CaliforniaAges 20–50 - NCT07437911Recruiting
Can a Supplement Help with Nutrient Gaps for GLP-1 Users?
This study tests whether a daily supplement can help fill nutrient gaps and improve gut health for people who are already taking GLP-1 weight-loss medications (like Ozempic or Wegovy). Participants must be on a stable dose for at least 8 weeks and be generally healthy without other chronic conditions.
Santa Monica, CaliforniaAges 18–59 - NCT07435831Recruiting
Kimchi and gut health study
This trial tests whether eating kimchi every day for 3 weeks can improve gut health in people who are overweight. You'll be asked to eat study food daily and follow the study plan.
Davis, CaliforniaAges 19–70 - NCT07428538RecruitingPhase 3
Testing larsucosterol for severe alcohol-related hepatitis
This trial tests a new medicine called larsucosterol to see if it helps people with severe alcohol-related hepatitis (liver inflammation from heavy drinking). If you qualify, the study will monitor your safety and recovery over 90 days.
Coronado, CaliforniaAges 18 years+ - NCT07420400Recruiting
Detecting heart shunts without needles
This trial uses a specialized ultrasound test (TEE with bubble study) to find a small opening in the heart called a PFO. It may help people who need this test to check for causes of certain health problems.
La Jolla, CaliforniaAges 18 years+ - NCT07420205RecruitingPhase 2
Sleep health study for U.S. Marines
This study looks at the sleep health of active-duty U.S. Marines. If you join, researchers will check your sleep patterns and may offer ways to improve your rest.
San Diego, CaliforniaAges 18 years+ - NCT07410585Recruiting
Matching body clock to daily life for student well-being
This study tests if an app that helps match your daily schedule to your body's natural sleep-wake clock can improve well-being and happiness in college students. If you are a UCSD undergraduate with an Apple device, you may be able to join.
La Jolla, CaliforniaAges 18 years+ - NCT05981573Recruiting
Measuring methadone doses for chronic pain
This trial is for people with chronic pain who take daily methadone. It aims to measure how much methadone is in your body to help doctors find the right dose.
Lemon Grove, CaliforniaAges 18–70 - NCT07391904Enrolling by invitation
Testing lab result communication for older adults
This study tests a tool designed to help older adults understand their lab results more easily. Researchers want to see if the tool improves patient understanding and engagement.
Los Angeles, CaliforniaAges 65 years+ - NCT06170437Recruiting
Smoke-free Home Study in Subsidized Housing
This study looks at ways to help people who live in subsidized housing make their homes smoke-free. You may be able to join if you are a current smoker and smoke inside your home.
San Francisco, CaliforniaAges 18 years+ - NCT07364799Recruiting
Sound therapy for stress in detained teens
This trial tests a multi-sensory therapy called SoundHeal for teens in juvenile detention. It uses sound and vibration to help with stress, anxiety, depression, or substance use.
San Luis Obispo, CaliforniaAges 12–18 - NCT07332312Recruiting
Cancer support program for American Indian and Alaska Native patients in rural California
This study tests a culturally informed patient navigation program designed to help American Indian and Alaska Native cancer patients reduce delays between diagnosis and treatment. It offers support through community advisors, focus groups, and a navigation program tailored to patients living in the Toiyabe Indian Health Program service area.
Bishop, CaliforniaAges Any age - NCT06870136Recruiting
Lion's Mane supplement for memory and focus
This study tests a Lion's Mane supplement to see if it helps with memory, focus, and overall thinking. If you are between 40 and 75 and have mild concerns about your thinking, you may be able to take part.
Los Angeles, CaliforniaAges 40–75 - NCT07290478Enrolling by invitation
Helping You Choose a Health Care Proxy
This study helps you name someone to make health decisions for you if you can't. It's for older adults or people with serious conditions, and it aims to make this important choice easier.
Martinez, CaliforniaAges 18 years+ - NCT07285785RecruitingPhase 4
Rifaximin for children with acute diarrhea
This study tests whether a medicine called rifaximin, taken along with oral rehydration solution, helps children aged 6 to 11 recover faster from acute (short-lasting) diarrhea that is likely caused by a bacterial infection. The study compares rifaximin plus oral rehydration versus oral rehydration alone.
Lynwood, CaliforniaAges 6–12 - NCT07282639Recruiting
App-based diabetes education for type 1 diabetes
This study tests an app-based diabetes education program for people with type 1 diabetes. It aims to see if the app can help you manage your blood sugar levels better using insulin pens and a continuous glucose monitor.
Los Angeles, CaliforniaAges 18 years+ - NCT07285707Recruiting
Acupuncture and herbs for long COVID
This small study tests whether acupuncture and Chinese herbal medicine can help relieve common long COVID symptoms like fatigue, cough, brain fog, and pain. It might be a good fit if you are struggling with ongoing symptoms after COVID and are looking for a treatment approach that isn't just more medication.
Whittier, CaliforniaAges 18 years+
Where these studies are running in California
Institutions with a site for the recruiting health studies listed above.
- Scripps Health · 2 studies
- Ablon Skin Institute and Research Center
- Alethios (Virtual)
- Alliance Research Institute
- Cedars Sinai Medical Center (CSMC)
- Cedars-Sinai Medical Center
- Center for Dermatology Clinical Research
- Citruslabs
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.