Clinical trials
Gut Microbiota clinical trials
Below are recruiting gut microbiota clinical trials, each written for real people, not researchers. We’re tracking 160 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07094984Recruiting
Clearing resistant gut bacteria: three FMT methods
This trial tests three different ways to clear antibiotic-resistant bacteria from your gut using fecal microbiota transplant (FMT). It may help if you have a confirmed resistant infection and are looking for a treatment to reduce the risk of future infections.
WarsawAges 18 years+ - NCT06532110Recruiting
Gut bacteria study in chronic digestive diseases
This study looks at the bacteria in your gut (the microbiome) in people with chronic gut conditions. Researchers want to understand how gut bacteria differ in these conditions to help improve treatments.
Hamilton, OntarioAges 18–75 - NCT07220369Recruiting
Gut mini-pill study: testing a new capsule
This trial tests a special mini-pill that may help your gut health. You'll take the pill and provide stool samples while eating provided meals.
Boston, MassachusettsAges 50–75 - NCT05862363Recruiting
Food and samples study in underweight pregnancy and indigestion
This study looks at how food support and sample testing might affect gut and stomach health in women who are underweight or have “functional dyspepsia,” including during pregnancy. It may help researchers learn whether this approach improves digestive symptoms and related health markers for mothers and babies.
Dhaka, Dhaka DivisionAges 18–35 - NCT07046897Recruiting
Probiotic study: Gut bacteria and your health
This trial tests if eating probiotic bacteria changes the types of bacteria in your gut. It may help researchers understand how probiotics affect overall health.
LundAges 18–65 - NCT07365514RecruitingPhase 1
Blackcurrants study for bone health in postmenopausal women
This trial tests if taking a blackcurrant supplement can help maintain bone density and reduce osteoporosis risk in postmenopausal women. You will take daily capsules and provide blood, stool, and bone scan samples over the study period.
Storrs, ConnecticutAges 45–70 - NCT06941090Recruiting
Stool sample collection for nutrition gut health study
This study asks participants of the NutriNet-Santé health study to provide a stool sample. Researchers want to understand how diet and gut bacteria affect health.
BobignyAges 18 years+ - NCT05605353Recruiting
Using gut bacteria to study pelvic cancers
This study looks at gut bacteria (and the chemicals they make) in people being treated for pelvic cancers. The goal is to understand what might be happening in the gut and how it could relate to pelvic cancer.
Aberdeen, ScotlandAges 16–99 - 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 - NCT07154173Recruiting
Gut bacteria study in metastatic colorectal cancer
This study looks at gut bacteria in people with colorectal cancer that has spread (metastatic). It aims to find patterns in the bacteria that may help doctors choose better treatments.
Guangzhou, GuangdongAges 18–75 - NCT06837272Recruiting
Gut health and brain health in Alzheimer's disease
This study looks at how the bacteria in your gut might be connected to memory and thinking problems in Alzheimer's disease. It may help us understand if changes in the gut can affect brain health.
Jining, ShandongAges 60–80 - NCT06800469Recruiting
Gut bacteria study in pancreatic cancer surgery patients
This trial looks at gut bacteria in people having surgery for pancreatic cancer. It aims to understand how these bacteria might affect recovery or treatment outcomes.
Bologna, BOAges 18 years+ - NCT07443280Recruiting
Gut health supplement study for dialysis patients
This trial tests whether a special blend of probiotics and prebiotics (called a synbiotic) can improve gut health and reduce harmful waste products in the blood for people on hemodialysis.
Taichung, Wuqi DistrictAges 18 years+ - NCT03373721Recruiting
Compare gut microbes in preterm vs full-term babies
This study looks at differences in the gut bacteria of babies born early (preterm) compared with babies born full-term. It may help researchers understand how early birth affects early health and gut development.
ShanghaiAges 1 day–4 months - NCT06809660Recruiting
Gut bacteria and cancer risk from everyday chemicals
This study looks at how chemicals in the environment (called endocrine disruptors) might affect the natural bacteria in your gut and whether that could play a role in colorectal cancer. If you are having a colonoscopy (endoscopy), you may be able to participate.
PoitiersAges 18 years+ - NCT07592975Recruiting
Food with Fiber and B-Vitamins for Gut Health in Older Adults
This study tests whether adding special fibers (prebiotics) and B-vitamins to food can improve your gut bacteria, reduce inflammation, and support mental health. You'll eat fortified foods for several weeks while researchers track changes in your digestion and wellbeing.
Coleraine, County LondonderryAges 50 years+ - NCT06735651Recruiting
Wild blueberries for gut, brain, and heart health in prediabetes
This study looks at whether eating wild blueberries can improve your gut health, brain function, and heart health if you have prediabetes. It may help lower your blood sugar and reduce your risk for diabetes and heart disease.
Atlanta, GeorgiaAges 20–65 - NCT07624409Enrolling by invitationEarly Phase 1
Occupational health study for high-altitude workers
This study examines how working at high altitudes (where there is less oxygen in the air) affects employees at an astronomical observatory in Chile. Researchers want to understand health impacts and develop better support for people working in these extreme conditions.
San Pedro de Atacama, AntofagastaAges 20–50 - NCT07619560Recruiting
Probiotic Cocktail to Slow Early Parkinson's Disease
This study tests whether a special blend of probiotics (good bacteria), an amino acid called tryptophan, and branched-chain amino acids can help slow the progression of early-stage Parkinson's disease. The idea is that these supplements may work through your gut bacteria to help protect your brain.
TaipeiAges 30–85 - NCT07320287Recruiting
Probiotics for babies born by C-section
This trial tests whether a multi-strain probiotic supplement can help with growth, digestion, and gut health in healthy full-term babies who were born by C-section.
HanoiAges birth–1 day - NCT06474234RecruitingPhase 2
Probiotic for Gut Health in Young Children
This study tests whether a probiotic (a 'good bacteria' supplement) can help balance the gut bacteria in young children. Your child may be able to join if they are healthy, under 7, and haven't taken probiotics or antibiotics recently.
Cheras, Kuala LumpurAges 1 month–7 years - NCT05449119Recruiting
Study links gut health, diet, and thinking and movement in seniors
This study looks at how differences in gut bacteria and nutrition may relate to changes in thinking and movement in people over 75 who have a reduced appetite (“small eaters”). It may help doctors better understand what could be contributing to these problems and how nutrition might play a role.
DijonAges 75 years+ - NCT06298409RecruitingPhase 1
Rifaximin for SIBO: Gut Bacteria Study
This study tests how Rifaximin (a medicine for SIBO) affects the bacteria and other substances in your gut. You'll swallow a small capsule that collects samples as it travels through your digestive system, so researchers can see how your gut changes during treatment.
Mountain View, CaliforniaAges 18–80 - NCT05319067Recruiting
Gut bacteria study in toddlers on long-term reflux antibiotics
This study compares gut bacteria (microbiome) in toddlers who take an antibiotic to prevent urine infections for vesicoureteral reflux, versus other similar children. It may help researchers understand how long-term antibiotic use and reflux affect gut health and future risk.
MontpellierAges 1–3
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Common questions
- Are there clinical trials for gut microbiota?
- Yes. Clin2 currently lists 160 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.