Clinical trials
Microbiome clinical trials
Below are recruiting microbiome clinical trials, each written for real people, not researchers. We’re tracking 346 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06649201Recruiting
Study of vaginal health after stem cell transplant
This study looks at how stem cell transplants affect the vagina, especially if you develop a condition called graft-versus-host disease (GVHD). Researchers will examine the vagina and test its natural germs (microbiome) to better understand and possibly improve treatment.
Cleveland, OhioAges 18–70 - NCT06643065Recruiting
Vaginal microbiome and pregnancy with genetically normal embryos
This study looks at how the natural community of germs (microbiome) in the vagina might affect the chance of becoming pregnant after transferring a genetically normal embryo. It could help doctors understand if the vaginal environment plays a role in IVF success.
BarcelonaAges 18–50 - NCT06588166Recruiting
Stool microbiome test for colon cancer screening
This study tests if a stool microbiome test can help find colorectal cancer early in people who already had a positive FIT screening test. You would give a stool sample and your microbiome results will be compared to what the colonoscopy finds.
RomaAges 50–74 - NCT06533852RecruitingPhase 3
Fecal transplant trial for liver cirrhosis complications
This study tests whether stool from healthy donors can help people with advanced liver disease (cirrhosis) who have had complications like fluid buildup. You would receive the transplant through a colonoscopy or enema.
BarcelonaAges 18 years+ - NCT05510622Recruiting
Uterine microbiome study for recurrent pregnancy loss
This study looks at the normal bacteria and other microorganisms in the uterus to better understand recurrent pregnancy loss. You may be in a group with recurrent pregnancy loss or in a comparison group without pregnancy loss, and you’ll be asked to meet specific health and timing rules for samples.
Ho Chi Minh City, Ho Chi Minh CityAges 18–38 - NCT06221800Recruiting
Gut bacteria and lung cancer treatment side effects study
This study looks at how the bacteria in your gut (microbiome) might affect how well your lung cancer treatment works and what side effects you experience. The goal is to learn if certain gut bacteria can predict treatment response or side effects for people with advanced non-small cell lung cancer.
Orange, CaliforniaAges 18 years+ - NCT06206486Recruiting
Gut germs and pain after kidney transplant
This study looks at whether the germs in your gut (microbiome) and certain chemicals in your blood affect pain after a kidney transplant. By joining, you may help doctors better understand and manage pain for future kidney transplant patients.
Chicago, IllinoisAges 18 years+ - NCT05505110RecruitingEarly Phase 1
Vaginal seeding to change a baby’s early gut microbes
This early-phase study looks at whether swabbing a mother’s vagina during a planned C-section (“vaginal seeding”) can help shape a newborn’s early respiratory and gut microbes. The goal is to see if this approach is safe and may influence early-life breathing health.
Nashville, TennesseeAges 18–40 - NCT05982795Recruiting
How CF modulators affect lung bacteria
This study looks at how highly effective CF modulator therapies change the bacteria living in the lungs of people with cystic fibrosis. Understanding these changes may help improve future treatments.
Lebanon, New HampshireAges 18–99 - NCT05963711Recruiting
Study penis microbiome in partners during vaginal microbiome treatment
This study looks at how the bacteria on a man’s penis may change during a woman’s vaginal microbiome transplant (VMT) for recurrent bacterial vaginosis (BV). You may be asked to follow condom and “decolonization” steps to help the researchers understand what works and why.
JerusalemAges 18 years+ - NCT05966649Recruiting
Synbiotics for preventing preterm birth in higher-risk pregnancies
This trial tests whether taking synbiotics (a mix of “good” probiotics and “food” for them) can help lower the chance of going into labor too early. It’s for pregnant people with certain risk factors for preterm birth, and it compares outcomes while you follow the study plan.
Edegem, AntwerpenAges 18 years+ - NCT05692024RecruitingPhase 1/Phase 2
Coffee and gut bacteria study after colon or rectal cancer
This early-phase study tests whether a coffee-related approach can change gut bacteria and blood “metabolites” after treatment for stage I–III colon or rectal cancer. The goal is to learn if these changes could help improve health after standard cancer treatment.
Boston, MassachusettsAges 18 years+ - NCT05670288Recruiting
Studying how gut bacteria affect digestion after spinal cord injury
This study looks at how changes in gut bacteria may affect bowel function and metabolism during the first year after a spinal cord injury. You may be asked about bowel symptoms and other factors, and your results may help guide future care for digestion problems after injury.
Birmingham, AlabamaAges 18–85 - NCT05514899RecruitingPhase 2
Cannabidiol and THC study for gut health and brain inflammation in HIV
This Phase 2 study tests whether cannabidiol (CBD) and tetrahydrocannabinol (THC) change the gut microbiome and brain-related inflammation in people with HIV. It may help researchers understand new ways to reduce inflammation, but you would need strict cannabis and CBD/THC avoidance during the study.
San Diego, CaliforniaAges 21–70 - NCT05334888Recruiting
Study how sex and gut bacteria relate to heart risk
This study follows people over time to understand how sex-related factors and gut bacteria may affect heart and blood-vessel risk. It may help researchers identify who could benefit from earlier prevention, based on personal risk patterns.
BerlinAges 18–50 - NCT04775355Recruiting
Track urine and gut changes during prostate cancer treatment
This study looks at how your urine and gut (intestine) microbes change while you undergo prostate cancer treatments, including hormone therapy (androgen deprivation) and/or radiation. The goal is to better understand these biological changes, which may help improve future treatment planning.
Duarte, CaliforniaAges 18 years+ - NCT07877766Enrolling by invitation
Microbiome study for patients having neck fusion surgery
This study looks at the bacteria in your body before and after neck surgery to see if they affect recovery. It may help improve care for future patients.
New York, New YorkAges 18–80 - NCT07424469Recruiting
Leaks in the esophagus or stomach: microbiome role
This study looks at the role of tiny organisms (the microbiome) in leaks from the esophagus or stomach. Researchers will take small tissue samples to learn more about these leaks and how to treat them better.
Dallas, TexasAges 18 years+ - NCT05037825Recruiting
Study gut microbes with immune therapy in several solid cancers
This trial looks at how the gut microbiome (the bacteria in your digestive system) relates to outcomes when you take standard immune “checkpoint” cancer medicines. If you’re eligible, they’ll collect stool samples while you receive treatment for certain cancers.
Elizabethtown, KentuckyAges 18 years+ - NCT05353504Recruiting
Testing how gut changes affect food choices
This study looks at whether interventions that change your gut bacteria can change how you decide what to eat. It may help researchers understand the gut–brain link behind eating behavior.
LeipzigAges 18–60 - NCT05359796Recruiting
Study of long-term type 1 diabetes symptoms and characteristics
This study looks at what day-to-day health and medical features are like in people who have had type 1 diabetes for many years. It may help researchers better understand long-term needs in type 1 diabetes and guide future care.
Changsha, HunanAges Any age - NCT05307367Recruiting
Study exercise and body muscle changes in advanced lung cancer
This study looks at why cancer can cause loss of muscle in people with advanced non–small cell lung cancer, and whether exercise can improve or explain those muscle changes. You may be asked to do physical testing and answer questionnaires while receiving standard palliative cancer treatment.
Copenhagen, DKAges 18–100 - NCT04625556Recruiting
Urology cancer registry study using body microbiome data
This study builds a patient registry for prostate, kidney, bladder, and ureter cancers by analyzing your body’s microbiome (the microbes living in/ on the body). It may help doctors personalize care in the future, and your participation mainly involves allowing your medical and related information to be used for research.
SeoulAges 20 years+ - NCT05445544Recruiting
Study of belly and baby microbes to improve preeclampsia screening
This study looks at tiny living organisms in pregnancy (and related body samples) to find better ways to screen for preeclampsia. By learning early warning signs, it may help doctors identify risk sooner during routine prenatal care.
Guangzhou, GuangdongAges 18 years+
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Common questions
- Are there clinical trials for microbiome?
- Yes. Clin2 currently lists 346 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.