Clinical trials
Gut Microbiota clinical trials
Below are recruiting gut microbiota clinical trials, each written for real people, not researchers. We’re tracking 145 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07110311Recruiting
How pet cats affect nose and gut bacteria in cat allergy patients
This study looks at how living with a pet cat might affect the bacteria in your nose and gut if you have dust mite and cat allergies. It could help us understand if cats actually change your allergy symptoms or the balance of bugs in your body.
Nanjing, JiangsuAges 18–65 - NCT07085299Recruiting
Gut bacteria and recovery in brain artery narrowing
This study looks at how the bacteria in your gut might affect outcomes in people with narrowed brain arteries. Researchers will track your health over time to see if there are links between your gut bacteria and your recovery.
Nanjing, JiangsuAges 30–80 - NCT07081698Recruiting
Walnuts as a first solid food for healthy babies
This study tests whether adding walnuts (ground into a powder or paste) as a first solid food is safe and healthy for breastfed babies. It may help families understand how to introduce nuts early.
Fort Collins, ColoradoAges 5 months–5 months - NCT07065942Recruiting
Lactulose for gut health in diabetes with constipation
This study tests if a common stool softener called lactulose can improve gut health and metabolism in people with type 2 diabetes and long-term constipation. It aims to see if changing gut bacteria can help both digestion and blood sugar control.
BeijingAges 18–70 - NCT07009223Recruiting
Lifestyle changes to prevent memory issues in depression
This study tests whether healthy lifestyle changes—like diet, exercise, or stress management—can help prevent memory and thinking problems in people with depression. It aims to find ways to protect your brain health as you age.
BresciaAges 50–80 - 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 - NCT05723913Recruiting
Test functional foods on blood sugar and gut bacteria
This study looks at how eating specific functional foods affects blood sugar after meals and changes in gut bacteria. It may help people understand ways to support healthy blood sugar and digestion, but it’s not for people with diabetes.
Mexico City, Mexico CityAges 18–60 - NCT06929845Recruiting
Organoid models for liver cancer study
This study uses tumor samples to create lab-grown mini-livers (organoids) to better understand liver cancer. It may help researchers learn more about the disease and develop new treatments.
RomaAges 18 years+ - NCT06895018Enrolling by invitation
Grape Drink Trial for Diabetes and Fatty Liver
This study tests a drink made from grape pomace (a natural byproduct) that is rich in polyphenols—compounds that may help the liver and heart. Participants have type 2 diabetes and mild fatty liver, and researchers want to see if the drink improves liver health, blood sugar, and gut bacteria over several months.
NaplesAges 35–70 - NCT06896240Recruiting
A smoothie supplement before and after knee revision surgery
This study tests whether drinking a special smoothie each day for 2 weeks before and after your knee revision surgery helps reduce inflammation and improve recovery. It is for people who have health conditions that cause inflammation, like diabetes or heart disease, and who are getting a knee replacement.
New York, New YorkAges 40–80 - NCT06867198Recruiting
Peanuts for heart, brain, and gut health
This study tests whether eating peanuts can improve health markers like blood sugar, brain function, and digestion in adults with prediabetes (higher than normal blood sugar levels). You may qualify if you are between 20-59 years old, have prediabetes, and a BMI in the overweight to obese range.
Atlanta, GeorgiaAges 20–59 - NCT06845527Recruiting
Gut bacteria testing in a clinic study
This study looks at people who visit a special gut bacteria clinic. It aims to learn more about their health by testing their gut bacteria as part of regular care.
Rome, RMAges 18 years+ - NCT06828159Recruiting
Can wild blueberries improve joint health?
This study tests whether eating wild blueberries can improve joint health in people with arthritis. You would eat blueberries or a placebo daily for several weeks to see if they help with pain and stiffness.
Oklahoma City, OklahomaAges 40–75 - NCT05946083RecruitingPhase 2
Study links binge drinking, gut bacteria, and brain function
This Phase 2 study looks at how binge drinking may change gut bacteria and how your brain works. You may qualify if you’re a Portuguese-speaking student and your drinking pattern and health history match the study rules.
Braga, Gualtar, BragaAges 18–23 - NCT04792320Recruiting
Probiotics and fiber for kidney disease with leg artery blockage
This study tests whether an oral absorbent plus probiotics can improve gut health and circulation in people who have chronic kidney disease and symptomatic peripheral artery disease (PAD). It will also track changes in blood markers and how well blood vessels function.
TaipeiAges 20 years+ - NCT06754319Recruiting
Gut bacteria and brain connection in child OCD
This study looks at how the bacteria in your gut might affect OCD in children and teens. It tests a possible link between your gut, brain, and OCD symptoms.
Shanghai, Shanghai MunicipalityAges 7–17 - NCT06645535Enrolling by invitation
Gut Bacteria and Blood Substances in Stiff Heart Failure
This study looks at how bacteria in your gut and certain substances in your blood relate to a type of heart failure called HFpEF (where the heart is stiff and doesn't relax well). It may help doctors understand the condition better and find new ways to treat it.
Naning, JiangsuAges 18 years+ - NCT06451913RecruitingPhase 4
Probiotic for gut health during Lyme disease antibiotics
This trial tests if a probiotic (Saccharomyces boulardii) can help maintain healthy gut bacteria while you take antibiotics for the early skin rash of Lyme disease (erythema migrans). You'll take amoxicillin for 14 days, plus either the probiotic or a placebo.
LjubljanaAges 18 years+ - 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+ - 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 - 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+ - 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 - 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
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Common questions
- Are there clinical trials for gut microbiota?
- Yes. Clin2 currently lists 145 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.