Clinical trials
Microbiota clinical trials
Below are recruiting microbiota clinical trials, each written for real people, not researchers. We’re tracking 409 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT04105270RecruitingPhase 2
Durvalumab plus chemo with RMT for lung cancer
This Phase 2 trial studies a new treatment plan that combines RMT with durvalumab and chemotherapy in people with untreated advanced lung adenocarcinoma. It aims to improve outcomes by helping the immune system and fighting cancer cells together.
Phoenix, ArizonaAges 18 years+ - NCT04292067Recruiting
Study gut bacteria in people with arthritis
This study compares the gut microbiome (the bacteria in your intestines) in adults with spondyloarthritis or rheumatoid arthritis versus healthy adults. It aims to better describe differences that may help explain these diseases.
Boulogne-BillancourtAges 18 years+ - NCT04303325RecruitingPhase 4
Esketamine after breast surgery for depression and gut changes
This trial studies whether esketamine given around the time of breast cancer surgery can improve depression and change gut bacteria. It also monitors your sleep/deep anesthesia level (with a simple monitoring number).
Shenyang, LiaoningAges 18–65 - NCT04540432Recruiting
Study how gut bacteria change with juvenile arthritis treatments
This study looks at how the “gut microbiome” (the helpful bacteria in the intestines) changes in children with juvenile enthesitis-related arthritis. It may help doctors understand how different treatment approaches affect gut bacteria over time.
Nîmes, GardAges 6–18 - NCT04700579Recruiting
Study lung changes before and after treatment for active TB
This study looks at changes in the lungs and immune system before TB treatment and again after treatment. By sampling lung fluid and comparing it over time, researchers hope to learn signatures that reflect how TB responds to care.
Cape Town, Western CapeAges 18–60 - NCT04706988Recruiting
Asthma study linking lung bacteria to asthma types
This study looks at the tiny germs in your airways (airway microbiota) to better understand different asthma “types” and what might drive symptoms. It may help researchers find more personalized approaches to asthma care by learning how lung bacteria relate to your asthma features.
ShatinAges 18 years+ - NCT04730622Recruiting
Studying muscle and bone changes after a hip fracture
This study looks at how bone health and muscle strength (“osteosarcopenia” — loss of both bone and muscle) change after a hip fracture in older adults. It may help doctors understand who is at higher risk and how to better support recovery after hip surgery.
BolognaAges 65 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+ - NCT04853212Recruiting
Study gut microbiome differences in people with spondyloarthritis
This study looks at whether changes in the gut bacteria (called microbiome dysbiosis) are linked to spondyloarthritis. It compares people with the condition to people without it who are already planning a digestive scope for another reason.
Boulogne-BillancourtAges 18 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+ - NCT04919265Recruiting
Mother and baby health study from early pregnancy
This study follows pregnant people and their babies from the first few months of pregnancy through at least one year after birth. It aims to learn how health and development turn out, especially for mothers who can keep coming to the same clinic for follow-up.
Kajang, SelangorAges 18–45 - NCT04924270RecruitingPhase 2
Capsule stool transfer for newly diagnosed inflammatory bowel or joint disease
This Phase 2 study tests whether taking capsule stool (FMT) is safe and can help people who are newly diagnosed and haven’t started the usual medicines yet. Participants will also start the standard first-line treatment for their condition, and the study will compare safety and outcomes.
OdenseAges 18–75 - NCT04970446RecruitingPhase 1/Phase 2
Fecal transplant to restore gut microbes in Crohn’s
This Phase 1/2 study tests whether a fecal microbiome transplant (FMT) can reduce active inflammation in people with Crohn’s disease. It’s designed for people who currently have signs of active bowel inflammation and can attend regular procedure visits.
Melbourne, VictoriaAges 18–70 - NCT05000996Recruiting
Gut microbiome study for people having metabolic surgery
This study looks at your gut bacteria (your “microbiome”) around the time of metabolic surgery. It may help researchers understand how surgery affects gut health and related conditions like diabetes, blood pressure, and cholesterol.
Nashville, TennesseeAges 21–65 - NCT05077618Recruiting
Teeth bacteria study in seniors with and without Alzheimer’s
This study looks at the bacteria in the mouth (periodontal microbiota) to see whether they differ between seniors with Alzheimer’s disease and seniors without it. You may be asked for a sample from your gums/teeth and background health information.
Nice, CHU de NICEAges 18–90 - 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+ - NCT05232331Recruiting
Eat nitrate-rich vegetables to study gum inflammation and mouth bacteria
This study looks at whether eating more nitrate-rich vegetables changes inflammatory markers and the balance of bacteria in the mouth for people with periodontitis (serious gum disease). It may help us understand better diet-based support alongside standard non-surgical gum treatment.
Guadalajara, JaliscoAges 30–65 - NCT05251389RecruitingPhase 1/Phase 2
Fecal microbiome transplant after anti-PD-1 melanoma not working
This trial tests whether a fecal microbiome transplant (FMT) can help your body respond better to anti-PD-1 immunotherapy in advanced skin melanoma. It is for people whose melanoma has progressed despite anti-PD-1 treatment.
AmsterdamAges 18 years+ - NCT05259059Recruiting
Diet plan to change breast milk and support infant gut health
This study tests whether changing a nursing mother’s diet can improve breast milk “microbiota” (the helpful bacteria community) and support early infant health. You may be asked to follow specific nutrition strategies during the first months after birth.
Hong KongAges 1 month–40 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+ - NCT05322343Recruiting
Study biobank and brain health in people age 55–80
This study collects blood samples to build a biobank and learn how brain health changes with age. Some participants may also do an MRI scan to better understand brain changes and immune response.
Bordeaux, BordeauxAges 55–80 - NCT05323357Recruiting
Study using gut samples to understand germs and your immune system
This study collects gut tissue (biopsies) and blood to learn how gut germs (microbes) and the immune system interact. It may help researchers understand why gut infections or immune problems happen and improve future treatments.
BernAges 18–80 - NCT05327790RecruitingPhase 2
Fecal transplant to boost new biologic treatment for ulcerative colitis
This trial tests whether fecal microbiota transfer (a stool-based therapy) can improve outcomes when added to starting a new biologic medicine for ulcerative colitis. It compares fecal transplant versus placebo (a sham treatment) to see if symptoms and inflammation improve faster or more strongly.
Edmonton, AlbertaAges 18–75 - NCT05333471RecruitingPhase 1/Phase 2
Fecal transplant for chronic bowel inflammation in CGD
This study tests whether transplanting stool microbiome (fecal microbiota transplant) can improve chronic colitis in people with chronic granulomatous disease (CGD). It aims to reduce bowel inflammation and symptoms by changing gut bacteria.
Bethesda, MarylandAges 10–60
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Common questions
- Are there clinical trials for microbiota?
- Yes. Clin2 currently lists 409 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.