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
- NCT04791540Recruiting
Rehab study for people with a tracheostomy and low muscle strength
This study looks at how nutrition and muscle health affect recovery during rehabilitation for people who have a tracheostomy (a breathing opening in the neck). It may help the rehab team improve food and care plans to support strength and overall health.
Florence, ItalyAges 18 years+ - NCT06576622Recruiting
Periodontal disease, bacteria, and miscarriage
This study looks at whether gum disease and oral bacteria are linked to repeated pregnancy loss. If you have had multiple miscarriages, your gum health may play a role.
ToulouseAges Up to 18 years - NCT06551285Recruiting
Nutrition supplement for PCOS: effects on health and quality of life
This study tests whether a nutritional supplement can improve metabolism, reduce inflammation, and enhance quality of life in women with polycystic ovary syndrome (PCOS). It aims to help manage PCOS symptoms through dietary support.
Valencia, ValenciaAges 18–45 - NCT06527326Recruiting
Gut bacteria and central serous chorioretinopathy study
This study looks at the link between gut bacteria and central serous chorioretinopathy (CSC), a condition where fluid builds up under the retina. It may help us understand why some people get CSC and find better ways to treat it.
Hanzhou, ZhejiangAges Any age - NCT06528041Recruiting
Chicory fiber and gut health study
This study tests whether a natural fiber from chicory root can change and keep changes in your gut bacteria. It may help improve digestion and overall health.
West Lafayette, IndianaAges 18–45 - 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 - NCT06478823Recruiting
Healthy stool donors for fecal transplant studies
This trial is looking for healthy stool donors to provide samples for fecal microbiota transplantation, a treatment that uses healthy bacteria from stool to help people with certain gut diseases. As a donor, you would give stool samples regularly to help others.
Paris, ParisAges 18–49 - NCT06256614Recruiting
Washed stool transplant for type 1 diabetes
This trial tests if a washed microbiota transplant (a processed stool transplant from healthy donors) can help people with type 1 diabetes. It aims to see if this treatment can improve blood sugar control or reduce the need for insulin.
Nanjing, JiangsuAges 3–100 - NCT06461208RecruitingPhase 3
Fecal transplant for people with cirrhosis
This trial tests whether transplanting healthy gut bacteria (from donor stool) can improve outcomes in people with cirrhosis. If you have mild to moderate cirrhosis, you may be able to join.
BasildonAges 18 years+ - NCT06451588RecruitingPhase 2
Fecal transplant for inflammatory back pain
This study tests whether a fecal microbiota transplant (a procedure that transfers healthy bacteria into your gut) can reduce inflammation and improve symptoms in people with inflammatory back pain (axial spondyloarthritis). It may help if your current treatments are not working well enough.
TromsøAges 18–65 - NCT06370884RecruitingPhase 1
Gut bacteria transplant after colon surgery
This study tests whether transplanting healthy gut bacteria into people who have had part of their colon removed can improve recovery. It may help prevent infections or other complications after surgery.
Minneapolis, MinnesotaAges 18–75 - NCT06347770RecruitingPhase 1
Oral Gan Shuangbi for recovery after C-section
This trial tests an oral herbal medicine (Gan Shuangbi) to see if it helps your intestines work normally again after a C-section. It may speed up recovery after delivery.
Guangzhou, GuangdongAges 18–45 - NCT06307964Recruiting
Gut bacteria in alcoholic hepatitis
This trial is looking at bacteria inside the liver of people with alcoholic hepatitis. It may help understand how these bacteria affect the disease and lead to better treatments.
LyonAges 18 years+ - NCT06311006Recruiting
Safety registry for fecal transplant for C. diff
This registry tracks people who receive a fecal microbiota transplant (FMT) for a serious or repeat C. diff infection. It helps doctors better understand how safe and effective FMT is in real-world use.
ParisAges 18 years+ - NCT05303337Recruiting
Study of gut and HIV changes after switching to long-acting shots
This trial compares how HIV “reservoirs,” inflammation, and the gut microbiome change when people switch from daily HIV pills to long-acting injectable treatment. It may help you and your team understand what to expect with the switch and how your body responds.
MarseilleAges 18 years+ - NCT05078957Recruiting
Study gut microbiome in older adults with well-controlled HIV
This trial studies how the bacteria in your gut (“microbiome”) relate to frailty (weakness/low physical resilience) in people with HIV who are stably doing well on treatment. It may help researchers understand why some people become frail and how the gut may play a role.
MarseilleAges 55 years+ - NCT04899154Recruiting
Study tests gut bacteria to predict response in spine arthritis
This study looks at your gut bacteria (from a stool sample) to see whether it can predict how well you will respond to biologic medicines for spondyloarthritis. It may help doctors choose the most effective treatment for future patients.
MarseilleAges 18 years+ - NCT06292598Recruiting
Gut bacteria and sleep disorder study
This study compares gut bacteria and substances from the gut in people with type 1 narcolepsy versus those without. It aims to understand how gut health might be linked to this sleep disorder.
Nîmes, GardAges 10 years+ - NCT06206707Recruiting
FMT for Diarrhea and Colitis After Immunotherapy
This trial tests whether a treatment called fecal microbiota transplant (FMT) — transferring healthy gut bacteria — can help relieve diarrhea and colitis caused by immunotherapy drugs. If you have melanoma or kidney cancer and are experiencing diarrhea after immunotherapy, this study may offer a new option.
Aarhus NAges 18 years+ - NCT06228352Recruiting
Bile acids and gut bacteria in C. difficile with ulcerative colitis
This study looks at how bile acids and gut bacteria relate to C. difficile infection in children with ulcerative colitis. It aims to find better ways to predict and treat these infections.
ParisAges Up to 17 years - NCT06197308RecruitingEarly Phase 1
Testing a mouth bacteria treatment for PSC
This study tests whether a treatment made from mouth bacteria can help people with primary sclerosing cholangitis (PSC). It aims to see if it's safe and improves health.
Minneapolis, MinnesotaAges 18–76 - NCT06136793Enrolling by invitation
Healthy home habits for Chinese-heritage adults
This study tests a program to help Chinese-heritage adults with heart or diabetes conditions adopt healthier eating and lifestyle habits at home. It includes online resources and support to make lasting changes.
New Brunswick, New JerseyAges 30–70 - NCT06133530Enrolling by invitation
Human milk sugars for gut health in Antarctica
This study tests whether natural sugars found in human milk (called HMOs) can improve gut health and the immune system. Researchers are looking for healthy adults who are willing to travel to Antarctica for the study.
ErfurtAges 18–65 - NCT06139224Recruiting
Gut Bacteria and Inflammation in HIV and Heavy Drinking
This study looks at how gut bacteria and inflammation interact in people with both HIV and heavy alcohol use. It aims to find new ways to improve health by understanding these connections.
Chicago, IllinoisAges 45–75
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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.