Clinical trials
Gut Microbiota clinical trials
Below are recruiting gut microbiota clinical trials, each written for real people, not researchers. We’re tracking 158 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- 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 - NCT05996016Recruiting
Gut and vaginal bacteria in HIV-positive women
This study looks at the types of bacteria living in the gut and vagina of women with HIV, including pregnant women. It aims to understand how these bacteria might affect health.
Beijing, Beijing MunicipalityAges 14 years+ - NCT07450443RecruitingPhase 2/Phase 3
Gut health and autism: a study on the gut barrier and bacteria
This trial is looking at the connection between the gut and autism. It tests whether certain gut bacteria and the gut's protective barrier are different in children with autism and gastrointestinal issues. This could help find new ways to improve symptoms.
Milan, MIAges 3–8 - NCT03325855Recruiting
Fecal transplant registry for patients and donors
This study is a national “registry” that collects information from people who get fecal microbiota transplant (a stool-based treatment) and from people who donate stool. It helps researchers understand who receives these treatments and how they do over time.
Phoenix, ArizonaAges Any age - NCT07198984Recruiting
Boosting gut bacteria to improve digestive health
This study tests whether boosting certain gut bacteria can improve your gut health. If you're a healthy adult who exercises regularly or eats a flexitarian diet, this trial may be for you.
Jouy-en-JosasAges 20–80 - 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 - NCT05067595RecruitingPhase 1
Fecal transplant plus fiber for gut graft-versus-host disease
This Phase 1 study tests whether a fecal microbiota transplant (a stool-based treatment from a screened donor) plus a dietary fiber supplement can improve gut symptoms after a bone marrow transplant. It is aimed at people with mild to severe gut graft-versus-host disease (GVHD).
Seattle, WashingtonAges 18 years+ - NCT07460856Recruiting
Can Cranberries Improve Your Gut and Metabolic Health?
This study tests if eating cranberries can improve your gut health and metabolism. It’s for people who are overweight and have early signs of metabolic problems, like high blood sugar or high triglycerides.
Québec, QuebecAges 25–70 - NCT03148743Recruiting
Fecal transplant for gut graft-versus-host disease
This study tests whether a fecal transplant (FMT) can help treat gut graft-versus-host disease (gut GVHD), a condition where donated immune cells attack the intestines. If you have gut GVHD and meet age requirements, you may be eligible to receive this treatment in the trial.
Suzhou, JiangsuAges 10–60 - NCT04117321Recruiting
Study of mother-to-baby gut germs and baby health
This study looks at how germs in a mother can be passed to her baby and whether that affects the baby’s health. If you join, your baby (and the other parent or legal guardian) may be asked to share consent so researchers can follow the pregnancy and early life.
Hong Kong, Hong KongAges Any age - NCT05830591Recruiting
Gut microbiome study in autism in children
This trial studies differences in the gut bacteria (microbiome) between children with autism and healthy children. It may help researchers understand what roles the gut may play in autism and guide future treatments.
TriesteAges 1–17 - NCT06481852RecruitingPhase 1
Gut bacteria transplant for pulmonary arterial hypertension
This trial tests whether a special combination of antibiotics, fecal transplant (gut bacteria from healthy donors), and a fiber supplement can help people with pulmonary arterial hypertension (PAH). It aims to see if improving gut health can improve PAH symptoms and overall well-being.
Minneapolis, MinnesotaAges 18–75 - NCT04444362Enrolling by invitation
Probacine to protect organs after cardiovascular surgery
This study tests whether a medicine called Probacine can help protect your gut and organs after cardiovascular surgery. If you qualify, you may be asked to take part and follow the study plan to see if complications are reduced.
Beijing, Beijing MunicipalityAges 18–90 - NCT03819296RecruitingPhase 1
Fecal transplant to treat cancer immunotherapy bowel side effects
This early-phase study tests whether changing your gut bacteria with a fecal transplant can improve diarrhea or colitis caused by cancer immunotherapy. It may help people whose symptoms have not fully settled with standard treatments like steroids and other immune-blocking medicines.
Houston, TexasAges 18 years+
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Common questions
- Are there clinical trials for gut microbiota?
- Yes. Clin2 currently lists 158 recruiting gut microbiota 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 microbiota 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 microbiota 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.