Clinical trials
Microbiota clinical trials
Below are recruiting microbiota clinical trials, each written for real people, not researchers. We’re tracking 408 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06106698Recruiting
Washed microbiota transplant for C. diff infection
This trial tests a treatment called washed microbiota transplantation (WMT) for people with a C. diff infection that causes diarrhea. WMT uses processed donor bacteria to help restore healthy gut balance and fight the infection.
Nanjing, JiangsuAges 3–100 - NCT06116851Recruiting
Prostate health, gut bacteria, and cancer risk
This study looks at how your gut bacteria and prostate health may be connected to cancer risk. It may help find new ways to predict or prevent prostate cancer.
TurkuAges 18 years+ - 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 - NCT06146608Recruiting
Iron, gut bacteria, and how the body absorbs iron
This study looks at how different types of iron in food affect your gut bacteria and how well your body absorbs iron. It aims to understand the connection between diet, gut health, and iron levels in healthy adults.
Ithaca, New YorkAges 18–40 - NCT06161896Recruiting
Gut bacteria's role in lymphoma treatment
This study looks at the bacteria living in your gut (your gut microbiome) to see if they affect how well lymphoma responds to treatment. It involves collecting stool and blood samples before and during your standard R-CHOP chemotherapy.
Roskilde, Region SjællandAges 18 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 - NCT06197698Recruiting
Parkinson's and gut-brain connection study
This study is looking at how the bacteria in your gut might affect your brain in Parkinson's disease. It involves two types of brain scans to see differences between people with Parkinson's and healthy volunteers.
DouliuAges 20 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 - 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 - NCT06265246Recruiting
Milk and yogurt for stronger bones in young adults
This study tests whether adding milk and yogurt to your diet can improve bone health and body composition. If you're a young adult with low calcium intake, you may qualify to join.
Saskatoon, SaskatchewanAges 19–30 - NCT06265740Recruiting
Using vaginal bacteria to predict early labor
This study is testing a new way to predict early labor by looking at the bacteria in the vagina. If you are pregnant and in the hospital for possible early labor or a water break, a vaginal swab could help doctors understand why this happens.
Clermont-FerrandAges 18 years+ - NCT06266897Recruiting
Endometriosis and tissue bacteria study
This study looks at how tiny organisms (microbiota) inside the uterus and pelvis may be linked to endometriosis. If you are having surgery for endometriosis, researchers will collect tissue samples to compare the bacteria in your body with your symptoms.
Guangzhou, GuangdongAges 18–52 - NCT06283355RecruitingPhase 1
Comparing one vs. multiple nasal treatments in NICU babies
This study tests whether giving one versus multiple doses of a special nasal treatment (called nasal microbiota therapy, or NMT) changes the types of helpful bacteria in your baby's nose. The goal is to see if the treatment keeps bad bacteria, like staph, from growing.
Baltimore, MarylandAges birth–60 years - NCT06288464Recruiting
Fiber in tube feeding to improve gut health
This trial tests adding fiber to liquid food given through a stoma before stoma reversal surgery. The goal is to see if it helps improve the balance of good bacteria in the gut.
Preston, LancashireAges 18 years+ - NCT06291350Recruiting
Mouth bacteria in gum disease with blistering condition
This study looks at the bacteria in the mouth and gut of people with a blistering gum condition (mucous membrane pemphigoid) and gum disease. It aims to understand if certain bacteria are linked to the disease, which could lead to better treatments.
NiceAges 18 years+ - 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+ - NCT06319755Recruiting
Gut bacteria after Whipple surgery
This study looks at gut bacteria in people who had Whipple surgery for pancreatic cancer and in healthy volunteers. It aims to understand how the microbiome changes after surgery.
Camperdown, New South WalesAges 18 years+ - NCT05321745Recruiting
Fecal transplant for children with Crohn’s disease
This trial tests whether transferring stool microbes (called fecal microbiota transplantation, or FMT) can improve Crohn’s disease in children who have not gotten better with usual treatments. If you qualify, the study will check symptoms and colon imaging/score changes over the study follow-up.
Wuhan, HubeiAges 2–16 - NCT05400824Recruiting
Health study in La Réunion
This study looks at how metabolism and infections affect people in La Réunion. Participants will provide consent for genetic analysis and answer health questions.
La Réunion, Saint-PierreAges 18–67 - NCT06352203Recruiting
Probiotics for gut health in children with autism
This study tests whether taking probiotics (friendly bacteria) can help improve gut health and tummy problems in children with autism. It may be a good fit if your child has stomach issues and has not recently taken antibiotics or probiotics.
MadridAges 3–7 - NCT06355583RecruitingPhase 2
Gut bacteria transplant before stem cell transplant
This trial tests whether giving a transplant of healthy gut bacteria (fecal microbiota transplant) before a stem cell transplant can improve outcomes for people with certain blood cancers or bone marrow disorders.
Birmingham, EnglandAges 18 years+ - 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
Hear when a new Microbiota trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.
Common questions
- Are there clinical trials for microbiota?
- Yes. Clin2 currently lists 408 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.