Clinical trials
Microbiota clinical trials
Below are recruiting microbiota clinical trials, each written for real people, not researchers. We’re tracking 376 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06290258RecruitingPhase 1/Phase 2
Fecal transplant for autism with stomach issues
This study tests if transplanting healthy bacteria into the gut can help children and young adults with autism who also have stomach problems. It aims to improve both digestive and behavioral symptoms.
Taoyuan CityAges 7–30 - NCT06286709RecruitingPhase 2
Fecal transplant for PSC and colitis
This trial tests whether a fecal (stool) transplant from a healthy donor can help people with both PSC and inflammatory bowel disease. It aims to see if the treatment can improve liver health and reduce inflammation. You must have early to moderate liver scarring and be on stable medications.
BirminghamAges 18 years+ - NCT06218602RecruitingPhase 2
Fecal transplant for lymphoma patients getting CAR T therapy
This trial tests whether giving a fecal transplant (a stool enema from a healthy donor) can improve the response to CAR T-cell therapy in people with B-cell lymphoma. It may help by restoring healthy gut bacteria that are often wiped out by strong antibiotics.
Houston, TexasAges 18 years+ - NCT06228937Recruiting
Gut bacteria and lymphedema with repeated infections
This study looks at the bacteria in your gut and how they relate to lymphedema (swelling) and repeated skin infections in the affected limb. It compares people who have many infections with those who have none, to better understand why some get infections and others don't.
RomeAges 18–85 - NCT06182293Recruiting
Mouth bacteria in early systemic sclerosis
This study looks at the bacteria in the mouth (periodontal microbiota) of people with early systemic sclerosis compared to those without the condition. It may help understand if there is a link between oral health and systemic sclerosis.
StrasbourgAges 18 years+ - NCT06058520RecruitingEarly Phase 1
Capsule microbiome transplant for hidradenitis suppurativa
This trial tests whether taking capsules containing healthy gut bacteria (fecal microbiota transplant) can help treat hidradenitis suppurativa. You may qualify if you have HS and haven't taken antibiotics in the last 30 days.
Minneapolis, MinnesotaAges 18 years+ - 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+ - NCT05829109RecruitingEarly Phase 1
Stool transplant for long-term inflamed pouch after surgery
This early-phase study tests fecal microbiota transplant (a stool-based treatment) to improve chronic pouchitis symptoms in adults after UC-related surgery. It may help by changing gut bacteria, especially for people who need ongoing antibiotics or keep having flare-ups.
New York, New YorkAges 18 years+ - NCT05739825Recruiting
Fecal transplant to change gut bacteria in C. difficile infection
This trial studies whether fecal microbiota transplantation (a procedure that transfers healthy stool bacteria) can change a person’s gut bacteria after repeated C. difficile infection. It may help reduce recurring infections by restoring a healthier balance of gut microbes.
RomaAges 18–90 - NCT05679622Recruiting
Stool transplant study for children with mild to moderate ulcerative colitis
This trial studies whether transferring healthy stool bacteria into the gut (fecal microbiota transplantation, or FMT) can improve symptoms in children with ulcerative colitis. It may help by changing gut bacteria, especially for children who are newly diagnosed or who didn’t respond to standard treatments.
WuhanAges 2–16 - NCT05664113RecruitingPhase 1
Fecal transplant for gut problems after stem cell transplant
This study tests whether transplanting healthy donor stool into the gut can help children and young adults with ongoing digestive issues after a stem cell transplant. It may improve symptoms like diarrhea or the need for feeding tubes.
Memphis, TennesseeAges Up to 22 years - NCT05321758Recruiting
Stool transplant as first treatment for kids with Crohn’s
This study tests whether transferring healthy gut bacteria from stool into the colon can work as a first treatment for children newly diagnosed with mild-to-moderate Crohn’s disease. It may help reduce inflammation and improve symptoms, and it requires regular colonoscopy to monitor progress.
Wuhan, HubeiAges 2–16 - NCT05266807RecruitingPhase 3
Capsule fecal transplant to prevent C. difficile coming back
This study tests whether taking a capsule form of fecal microbiota transplant (FMT) can help adults with their first C. difficile infection—or a first relapse—get better and reduce repeat episodes. Participants also take specific antibiotics for C. difficile as part of the study process.
Basel, BaselAges 18 years+ - NCT05067595RecruitingPhase 1
Fecal transplant and fiber for gut graft-versus-host disease
This study tests whether a fecal microbiota transplant (a procedure that puts healthy donor bacteria into your gut) combined with a dietary fiber supplement can help treat gut graft-versus-host disease, a common complication after a stem cell transplant. It may help reduce diarrhea and other gut symptoms.
Seattle, WashingtonAges 18 years+ - NCT04935684RecruitingPhase 2
Fecal transplant after bone marrow transplant to improve gut health
This Phase 2 study tests whether a fecal microbiota transplant (a processed transplant of gut bacteria) after an allogeneic bone marrow transplant is safe and helpful. Participants may benefit by improving recovery in the gut microbiome during the post-transplant period.
AmiensAges 18 years+ - NCT04623424Recruiting
Study gut bacteria during stem cell transplant
This study looks at changes in your gut bacteria (microbiome) around the time of stem cell transplant. The goal is to understand how these bacteria relate to transplant outcomes, which may help doctors improve care in the future.
Detroit, MichiganAges 18–80 - NCT04203303Recruiting
Study how your gut microbes affect health and disease
This study looks at how the bacteria (microbes) living in and on your body relate to health and disease. It may help researchers understand what changes in these microbes mean for future treatments.
Rochester, MinnesotaAges 18 years+ - NCT04038619RecruitingPhase 1
Fecal transplant for immune-therapy diarrhea or bowel inflammation
This early-phase study tests whether stool/fecal microbiota transplant (a fecal transplant) can help people who develop significant diarrhea or colitis after immune-checkpoint therapy. It aims to reduce bowel inflammation and improve symptoms, while carefully checking for infections.
Houston, TexasAges 18 years+ - 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 - NCT03983473Recruiting
Testing stool samples to find gut bacteria markers in inflammatory arthritis
This study looks at stool (poop) samples to see whether gut bacteria patterns can help identify certain inflammatory arthritis conditions in people who have Crohn’s disease or axial spondyloarthritis. It’s mainly about matching stool “biomarkers” to diagnoses, which may help doctors recognize these conditions more accurately in the future.
Nancy, LorraineAges 18 years+ - NCT03562741Recruiting
Tracking outcomes of fecal transplant for repeated C. difficile
This study looks at how fecal microbiota transplantation (a transplant of healthy gut bacteria) works for people who get C. difficile infection repeatedly. It also focuses on collecting follow-up information to better understand which patients benefit and how.
Worcester, MassachusettsAges 16 years+ - NCT01868373Enrolling by invitationPhase 1
Fecal transplant study for hard-to-treat C. difficile diarrhea
This Phase 1 study tests defined fecal microbiota (healthy gut bacteria) given to people with C. difficile diarrhea that didn’t go away or came back soon after antibiotics. It may help by restoring a healthier balance of gut bacteria so the infection can stop recurring.
Houston, TexasAges 18 years+ - NCT03250091Recruiting
Stomach precancer check-up study after scope
This study follows people who have had an upper endoscopy (a camera test through the mouth to look at the stomach) to monitor precancerous stomach changes. It may help doctors learn the best way to watch these spots over time and catch problems early.
RigaAges 18 years+ - NCT04026360Recruiting
Study early lung, virus, and gut changes in children with cystic fibrosis
This study looks at how a child’s early lung function, viral infections, and gut (microbiome) changes affect cystic fibrosis over time. It may help doctors understand what predicts how lung disease develops, which could improve future care.
BernAges birth–18 years
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Common questions
- Are there clinical trials for microbiota?
- Yes. Clin2 currently lists 376 recruiting 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 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 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.