Clinical trials
Microbiome clinical trials
Below are recruiting microbiome clinical trials, each written for real people, not researchers. We’re tracking 351 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07439718Recruiting
Nutrition drink study for healthy adults
This study tests how a special nutritional drink affects the tiny organisms living in your small intestine. You will take the drink and provide stool samples to help researchers understand gut health.
LausanneAges 18–60 - NCT07109713Recruiting
Cranberry products and women's health study
This trial tests if cranberry-based products can affect the natural balance of bacteria in the female body. It aims to understand how diet might support women's health.
Chicago, IllinoisAges 18–45 - NCT03298334RecruitingPhase 1/Phase 2
Testing vaginal bacteria transfer to newborns after C-section
This study looks at whether they can safely place “healthy vaginal bacteria” from the mother into the newborn after a scheduled C-section, and whether it improves the baby’s health. It only enrolls certain mothers and babies based on infection testing and other health factors.
Falls Church, VirginiaAges birth–50 years - NCT05821010RecruitingPhase 2
Synbiotics and fecal transplant for non-alcoholic liver inflammation
This Phase 2 study tests whether taking special gut-helping products (synbiotics) and/or a fecal microbiota transplant can improve non-alcoholic steatohepatitis (NASH), a type of liver inflammation. It may help by changing gut bacteria that may affect liver health, but you must meet specific safety and medical criteria.
Amsterdam, North HollandAges 18–75 - NCT06207136Recruiting
Diet and Gut Bacteria in Parkinson's
This study looks at how diet and the bacteria in your gut (microbiome) affect Parkinson's symptoms. You'll work with a coach and take cooking classes to see if changing what you eat can help you feel better.
Vancouver, British ColumbiaAges 40–80 - NCT06466707Recruiting
Collecting gut bacteria samples from healthy volunteers
This study collects stool or other samples from healthy people to learn more about the helpful bacteria in our gut. It may help researchers understand how these bacteria affect health.
Ghent, East FlandersAges 2–70 - NCT07209007Recruiting
Skin and gut bacteria in healed burn wounds
This study looks at how burns change the bacteria on your skin and in your gut. It may help doctors understand healing better.
SeoulAges 19–65 - NCT07333482Recruiting
Flourish: How gut bacteria grow in C-section babies
This study looks at the gut bacteria of infants born by C-section. Researchers want to learn how the microbiome develops in healthy babies who have not taken probiotics.
Austin, TexasAges birth–3 months - NCT06264219RecruitingPhase 1
Restoring gut bacteria after C-section birth
This trial tests whether giving a small dose of the mother's vaginal bacteria to babies born by C-section can help restore their gut microbiome. It may reduce the risk of allergies and other immune-related conditions later in life.
Gentofte Municipality, CopenhagenAges 18 years+ - NCT06424041Enrolling by invitationPhase 2
Fecal transplant for fibromyalgia pain relief
This study tests whether transferring healthy gut bacteria from a donor can reduce pain in women with fibromyalgia. You would first take antibiotics and laxatives to prepare your gut, then receive the transplant through a colonoscopy.
Haifa, NorthAges 18–75 - 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+ - NCT06912126Recruiting
The Maggie Project: Exploring vaginal microbiome origins and heredity
This study looks at how the vaginal microbiome is passed between family members or close contacts. If you are a Belgian woman in good health who can join with her mother and another person, you may help researchers understand what shapes this bacteria community.
AntwerpAges 10 years+ - NCT06812091Recruiting
Study on microbiome in children
This study explores the role of the microbiome (the community of bacteria in our bodies) in children's health. It aims to develop new treatments for pediatric diseases.
SeoulAges Any age - 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 - NCT07761546Enrolling by invitation
Ai-test: microbiome nutrition for low testosterone
This study tests whether a special diet can improve symptoms of low testosterone in men. It is intended to help men with certain symptoms like a low sex drive or trouble having erections and whose blood tests show low to borderline testosterone levels.
AydinAges 30–65 - 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 - 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 - 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 - NCT07607158Recruiting
How Blueberries Work in Your Body
This study explores how your gut bacteria (the healthy microbes in your digestive system) affect how your body processes beneficial compounds in blueberries. Researchers want to understand this natural process by studying healthy adults.
Fort Collins, ColoradoAges 18 years+ - NCT06506786Recruiting
Fresh fruits and vegetables and your gut health
This study looks at how eating fresh garden foods affects the bacteria living in your gut (your microbiome). If you qualify, you may be able to take part in a 3-month study this fall.
Eugene, OregonAges 18–45 - 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+ - NCT07024238Enrolling by invitation
Short-chain fatty acid supplement for kidney transplant patients
This study tests whether taking a short-chain fatty acid (a type of fiber-like substance) supplement can improve gut health in people who have had a kidney transplant. It may help keep the transplant working well.
Martin, SlovakiaAges 18 years+ - 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 - NCT06876935Recruiting
Avocado for healthy growth in Hispanic infants
This study tests if feeding avocado to Hispanic infants when they start solids helps their gut health and development. We need families who are ready to offer avocado regularly for about 6 months, starting when their baby is around 6 months old.
Phoenix, ArizonaAges 3 months–6 months
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Common questions
- Are there clinical trials for microbiome?
- Yes. Clin2 currently lists 351 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.