Clinical trials
Microbiome clinical trials
Below are recruiting microbiome clinical trials, each written for real people, not researchers. We’re tracking 350 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06566898Recruiting
Tracking antibiotic resistance in pneumonia patients
This study uses advanced genetic testing to monitor antibiotic-resistant bacteria in people with pneumonia. It aims to understand how resistance develops and improve treatment choices.
Shanghai, Shanghai MunicipalityAges Any age - NCT06569368RecruitingPhase 2
Metronidazole with rectal cancer treatment
This trial tests adding the antibiotic metronidazole to standard pre-surgery therapy for locally advanced rectal cancer. The goal is to see if changing the bacteria in your gut can make the cancer treatment work better.
Houston, TexasAges 18 years+ - NCT06573892Recruiting
Gut Bacteria and Chronic Heart Failure
This study looks at how the bacteria in your gut (the microbiome) relates to chronic heart failure. Researchers want to see if certain probiotics (friendly bacteria) might help people with heart failure feel better.
AstanaAges 18 years+ - NCT06584565Recruiting
Predicting stroke recovery and risk using blood and stool tests
This study uses advanced analysis of your blood and stool samples to better predict how you will recover from a stroke and whether it might happen again. It aims to help doctors personalize your care after a stroke.
Guangzhou, GuangdongAges 18–75 - NCT06595160Recruiting
Diet and gut bacteria in pancreatic cancer treatment
This study looks at how diet and the bacteria in your gut might affect how well chemotherapy works for pancreatic cancer that can be surgically removed. If you have been newly diagnosed with this type of pancreatic cancer, you may be able to join.
Atlanta, GeorgiaAges 18 years+ - NCT06827977RecruitingPhase 2
Microbiome transplant for constipation and bloating in scleroderma
This study tests a microbiome transplant (friendly bacteria given as an enema or in capsules) to see if it helps with constipation and bloating in people with scleroderma. The goal is to improve digestive symptoms related to your condition.
Houston, TexasAges 18 years+ - NCT06604338Recruiting
Genes and gut bacteria in recurrent pregnancy loss
This study looks at genes and gut bacteria in women who have had repeated miscarriages without a known cause. It aims to find possible reasons for these losses and could help improve future care.
Porto Alegre, Rio Grande do SulAges Any age - NCT06606119Recruiting
Brain, bone marrow, and gut study after major injury
This study is looking at how the brain, bone marrow, and gut interact after a severe injury. It may help doctors understand how to better treat trauma patients.
Gainesville, FloridaAges 18–100 - NCT06607523Recruiting
Prebiotic treatment for brain injury recovery
This study tests whether a prebiotic (a type of fiber that feeds healthy gut bacteria) can improve recovery from a brain injury by helping the connection between the gut and the brain. Participants include people with a recent brain injury and their family members or staff, all of whom are part of the Moody Neurorehabilitation Institute community.
Galveston, TexasAges 18 years+ - NCT06614777Recruiting
Darier's disease immune and microbiome study
This study looks at immune markers and gut/skin bacteria in people with Darier's disease. It aims to better understand the condition, which could lead to better treatments in the future.
Toulouse, Centre Hospitalier Universitaire de ToulouseAges 18 years+ - NCT06655233Recruiting
Exploring gut bacteria in pancreatic cancer tumors
This trial studies bacteria found inside pancreatic tumors to see if they can help diagnose or predict the course of the disease. You may be eligible if you have a suspected pancreatic cancer and need a special biopsy (EUS-FNB).
Hunan, HunanAges 18–80 - NCT06662747Recruiting
Vaginal microbiome study for African women
This study is looking at the bacteria living in the vagina to understand what makes a healthy microbiome in African women. You will provide self-collected swabs and attend visits to help researchers learn more about vaginal health.
Kisumu, Kisumu CountyAges 18–40 - NCT06678516Recruiting
Does intermittent fasting change your blood microbiome?
This study tests if intermittent fasting (going without food for periods) affects the microorganisms in your blood. It may help researchers understand how fasting influences health.
Lanzhou, GansuAges 18–65 - NCT06691100Recruiting
How one workout changes gut bugs in women
This study looks at how a single workout changes the bacteria in your gut. It compares women who are very fit with women who don't exercise much, and includes women with different body types.
Washington D.C., District of ColumbiaAges 21–40 - NCT06699199RecruitingPhase 4
Testing silver diamine fluoride on mouth bacteria in kids
This study tests if a liquid medicine (silver diamine fluoride) painted on baby teeth cavities can change the bacteria in a child's mouth. It is for healthy children ages 4–10 with an open cavity.
Jeddah, Mecca RegionAges 4–12 - NCT04046900RecruitingPhase 1/Phase 2
Fecal-style transplant of vaginal microbiome for recurring BV
This trial tests whether transplanting “good bacteria” into the vagina can treat recurrent bacterial vaginosis (BV). It may help restore a healthier vaginal bacterial balance and reduce BV episodes.
Boston, MassachusettsAges 18–50 - NCT06709651Recruiting
Gut bacteria treatment for triple-negative breast cancer
This trial tests whether a treatment that targets your gut bacteria (microbiome) can help fight triple-negative breast cancer before surgery. It is for people with newly diagnosed, untreated triple-negative breast cancer that has not spread far.
Cork, MunsterAges 18 years+ - NCT06710574RecruitingPhase 4
Probiotics for sleep problems in Parkinson's disease
This study tests whether taking probiotics can improve REM sleep behavior disorder (RBD) in people with Parkinson's disease. You will receive either a probiotic supplement or a placebo, and researchers will use brain scans to see how it affects your symptoms.
BeijingAges 40–85 - NCT06735599Recruiting
Wild blueberries for blood pressure health
This study tests whether eating wild blueberries can improve your gut, brain, and heart health if you have high blood pressure. You'll eat blueberries daily for several weeks and have checkups to see how your body responds.
Atlanta, GeorgiaAges 45–65 - NCT06778083Recruiting
Antibiotic to prevent STIs and its effect on resistance
This study looks at taking doxycycline to prevent sexually transmitted infections (STIs) in men who have sex with men. It focuses on how this approach might affect the body's resistance to antibiotics.
LondonAges 18 years+ - NCT06793137RecruitingPhase 2
Antibiotics before surgery for advanced rectal cancer
This trial tests if taking antibiotics before standard treatment can improve outcomes for people with advanced rectal cancer that requires surgery.
São Paulo, São PauloAges 18 years+ - NCT06799351RecruitingPhase 2/Phase 3
Gut bacteria and nerve pain after chemo
This study looks at how bacteria in your gut (microbiome) might be linked to nerve pain from chemotherapy. It is for people who are already in the OzoParQT trial and will provide a stool sample to help understand this connection.
Las Palmas, Las PalmasAges 18 years+ - NCT06799481Recruiting
Home-based exercise to help brain tumor survivors with thinking and memory
This study tests whether a virtual home-based exercise program can improve thinking and memory problems caused by brain tumor treatment in teens and young adults. It also looks at how exercise affects gut health.
Atlanta, GeorgiaAges 15–39 - NCT06803706Recruiting
Gut bacteria changes during smoking quit attempt
This study looks at how quitting smoking changes your body's gut bacteria and metabolism. It is for people with a substance use disorder who want to stop smoking.
FehringAges 18 years+
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Common questions
- Are there clinical trials for microbiome?
- Yes. Clin2 currently lists 350 recruiting microbiome 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 microbiome 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 microbiome 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.