Clinical trials
Gut Microbiome clinical trials
Below are recruiting gut microbiome clinical trials, each written for real people, not researchers. We’re tracking 141 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06506786Recruiting
Fresh fruits and vegetables and your gut health
This study looks at how eating fresh garden foods affects the bacteria living in your gut (your microbiome). If you qualify, you may be able to take part in a 3-month study this fall.
Eugene, OregonAges 18–45 - NCT06738329Recruiting
How seaweed additive carrageenan affects gut bacteria
This study tests whether carrageenan, a seaweed-based food ingredient, changes the balance of bacteria in your gut. It could help us understand how common food additives affect digestion and overall health.
Reading, ReadingAges 18–55 - NCT07109713Recruiting
Cranberry products and women's health study
This trial tests if cranberry-based products can affect the natural balance of bacteria in the female body. It aims to understand how diet might support women's health.
Chicago, IllinoisAges 18–45 - NCT07333482Recruiting
Flourish: How gut bacteria grow in C-section babies
This study looks at the gut bacteria of infants born by C-section. Researchers want to learn how the microbiome develops in healthy babies who have not taken probiotics.
Austin, TexasAges birth–3 months - NCT06876935Recruiting
Avocado for healthy growth in Hispanic infants
This study tests if feeding avocado to Hispanic infants when they start solids helps their gut health and development. We need families who are ready to offer avocado regularly for about 6 months, starting when their baby is around 6 months old.
Phoenix, ArizonaAges 3 months–6 months - NCT05821010RecruitingPhase 2
Synbiotics and fecal transplant for non-alcoholic liver inflammation
This Phase 2 study tests whether taking special gut-helping products (synbiotics) and/or a fecal microbiota transplant can improve non-alcoholic steatohepatitis (NASH), a type of liver inflammation. It may help by changing gut bacteria that may affect liver health, but you must meet specific safety and medical criteria.
Amsterdam, North HollandAges 18–75 - NCT07575529Recruiting
Senior Milk Powder and Gut Health in Healthy Aging
This study tests whether a special milk powder containing beneficial bacteria and fiber (called synbiotics) can improve gut health in adults aged 40–65. You'll use a smartphone app and Apple Watch to track your health and provide samples over several weeks.
SingaporeAges 40–65 - NCT07071181Recruiting
Milk-based drinks for better sleep and health
This trial tests whether drinking a milk-based drink every day for four weeks can improve gut health, sleep quality, and heart health. It may be a good option if you have trouble sleeping and are overweight.
Leeds, West YorkshireAges 40–70 - NCT04359836Recruiting
Study of gut bacteria in early COVID-19
This trial studies how gut bacteria (“gut flora”) may affect COVID-19 after a recent infection. If you test positive for COVID-19 soon enough, the study may help researchers understand why some people get better faster or have different symptoms.
Ventura, CaliforniaAges 18 years+ - NCT04957511Recruiting
Testing gut bacteria in gynecologic cancer patients on immunotherapy
This study looks at how gut bacteria may relate to how well immunotherapy works in people with advanced or returning gynecologic cancer. You may be asked to give stool samples several times so researchers can measure changes in your gut microbiome.
Orlando, FloridaAges 18 years+ - NCT07052071Recruiting
TAVI's effect on gut bacteria in aortic stenosis
This study looks at how a heart valve procedure called TAVI affects the bacteria in your gut. It may help doctors understand how the procedure impacts your overall health.
AthensAges Any age - NCT07024238Enrolling by invitation
Short-chain fatty acid supplement for kidney transplant patients
This study tests whether taking a short-chain fatty acid (a type of fiber-like substance) supplement can improve gut health in people who have had a kidney transplant. It may help keep the transplant working well.
Martin, SlovakiaAges 18 years+ - NCT07567794Recruiting
Gut-Brain Connection Study in Parkinson's Disease
This research examines how the gut and brain are connected in Parkinson's disease and aims to better understand the disease. You'd participate in visits and tests over three years, including some involving your digestive system.
Stanford, CaliforniaAges 21–80 - NCT06206486Recruiting
Gut germs and pain after kidney transplant
This study looks at whether the germs in your gut (microbiome) and certain chemicals in your blood affect pain after a kidney transplant. By joining, you may help doctors better understand and manage pain for future kidney transplant patients.
Chicago, IllinoisAges 18 years+ - NCT05670288Recruiting
Studying how gut bacteria affect digestion after spinal cord injury
This study looks at how changes in gut bacteria may affect bowel function and metabolism during the first year after a spinal cord injury. You may be asked about bowel symptoms and other factors, and your results may help guide future care for digestion problems after injury.
Birmingham, AlabamaAges 18–85 - NCT07481578Recruiting
Exercise and gut health study for active men
This study looks at how your training load affects your gut bacteria and how that relates to exercise performance and muscle health. It may help understand overreaching in healthy men.
Leuven, Vlaams BrabantAges 18–45 - NCT06433310RecruitingPhase 4
A dietary supplement's effect on gut fungi in healthy adults
This study tests whether a dietary supplement (L-phenylalanine) can affect the natural balance of fungi in the gut. Healthy volunteers take the supplement for a short time, and researchers check how it changes their gut fungi.
New York, New YorkAges 18 years+ - NCT06207136Recruiting
Diet and Gut Bacteria in Parkinson's
This study looks at how diet and the bacteria in your gut (microbiome) affect Parkinson's symptoms. You'll work with a coach and take cooking classes to see if changing what you eat can help you feel better.
Vancouver, British ColumbiaAges 40–80 - NCT06691100Recruiting
How one workout changes gut bugs in women
This study looks at how a single workout changes the bacteria in your gut. It compares women who are very fit with women who don't exercise much, and includes women with different body types.
Washington D.C., District of ColumbiaAges 21–40 - NCT07093463Recruiting
Colon-delivered Vitamin B2 for Gut Health
This trial tests whether a special form of vitamin B2 (riboflavin) delivered to the colon can improve gut health in people with mild to moderate bowel complaints. The study compares the effects of this supplement to a standard diet add-on (inulin) and looks at changes in gut bacteria and symptoms.
Berlin, State of BerlinAges 50–70 - NCT06117930Recruiting
Brain tumor and gut bacteria study
This study looks at how the bacteria in your gut might be linked to brain tumors. Researchers want to collect samples (like stool and tissue) during brain surgery to better understand this connection.
Jacksonville, FloridaAges 18 years+ - NCT06264219RecruitingPhase 1
Restoring gut bacteria after C-section birth
This trial tests whether giving a small dose of the mother's vaginal bacteria to babies born by C-section can help restore their gut microbiome. It may reduce the risk of allergies and other immune-related conditions later in life.
Gentofte Municipality, CopenhagenAges 18 years+ - NCT07607158Recruiting
How Blueberries Work in Your Body
This study explores how your gut bacteria (the healthy microbes in your digestive system) affect how your body processes beneficial compounds in blueberries. Researchers want to understand this natural process by studying healthy adults.
Fort Collins, ColoradoAges 18 years+ - NCT06423508Recruiting
Testing stool storage methods and gut bacteria differences
This trial will study how different storage methods affect stool samples for gut bacteria analysis. It aims to understand differences in gut bacteria between people over time. Participation involves providing stool samples.
Vienna, State of ViennaAges 18–70
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Gut Microbiome trials by city
Studies with a site in or near these metro areas.
Gut Microbiome trials by state
Studies with a site anywhere in these states.
Common questions
- Are there clinical trials for gut microbiome?
- Yes. Clin2 currently lists 141 recruiting gut microbiome studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a gut microbiome trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a gut microbiome trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
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.