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
- NCT07636850Recruiting
How almonds affect gut bacteria in children
This study looks at whether eating almonds changes the helpful bacteria in kids' stomachs and intestines. Researchers will give some children almonds to eat and study how it affects their digestive health.
Tallahassee, FloridaAges 6–13 - NCT07650149Recruiting
Genetic and Lifestyle Factors in Weight Management
This study explores how genetics, gut bacteria, and behaviors influence weight gain and obesity. Researchers will examine these factors in adults who are overweight or obese to better understand what drives weight changes.
KrakowAges 18–60 - NCT07515430Enrolling by invitation
Gut Bacteria and Cancer Symptoms in Children With Leukemia
This study looks at how the bacteria living in your child's gut may affect cancer-related symptoms (like nausea, fatigue, or pain) during leukemia treatment. Researchers will collect stool samples and track symptoms to understand this connection better.
Guangzhou, GuangdongAges 5–18 - NCT06846138Enrolling by invitation
Herbal supplement to help metformin work better and cause fewer side effects
This study tests a special herbal blend added to metformin to see if it helps reduce stomach problems and improves blood sugar control in people with type 2 diabetes. Researchers want to understand how the herbs affect the bacteria in your gut.
RigaAges 25–80 - NCT06746077Enrolling by invitation
Lung disease study in children: new ways to understand infections
This study explores how the immune system and lung microbes affect children with lung disease. It uses extra fluid collected during a standard lung exam to look for new treatment targets.
Aarhus NAges birth–17 years - NCT06665490Enrolling by invitation
Skin care wash study for mycosis fungoides
This study tests whether a special skin care body wash can improve skin lesions in people with mycosis fungoides, a type of skin lymphoma. Researchers will look at skin bacteria before and after using the wash.
Chicago, IllinoisAges 18–89 - NCT06639126Enrolling by invitation
Thyme extract for functional gut issues
This trial tests whether a wild thyme extract can help with functional gastrointestinal disorders (common digestive problems without a clear cause). It focuses on the extract's anti-inflammatory and metabolism-related effects.
Granada, GranadaAges 18–75 - NCT06603519Enrolling by invitation
Can a diet reduce inflammation after a colonoscopy?
This study tests whether a special diet can help reduce inflammation and improve gut health after a colonoscopy. It is for people who are getting a repeat colonoscopy because they've had polyps before.
San Diego, CaliforniaAges 18 years+ - NCT06602934Recruiting
Pneumonia, heart health, and your body's germs
This study looks at how pneumonia affects the long-term health of your heart and lungs by studying the germs that live in your body. It may help doctors understand why some people get worse and how to better protect your heart after a serious infection.
AngersAges 18–80 - NCT06560554Enrolling by invitation
Fermented diet for long COVID microbiome health
This study tests whether eating fermented foods (like yogurt, kimchi, or sauerkraut) can improve gut health and ease symptoms in people with long COVID. You'll log your food on your phone and follow a fermented diet for a period of time.
Rochester, MinnesotaAges 18 years+ - NCT06381882Enrolling by invitation
Human microbiome study after pancreatic surgery
This study looks at how tiny organisms in your gut (the microbiome) affect recovery after surgery for pancreatic cancer or related growths. It may help doctors understand how to improve outcomes for future patients.
NieuwegeinAges 18 years+ - NCT06361524Enrolling by invitation
Gut bacteria study in chronic heart failure
This study looks at the bacteria in your gut (your 'gut microbiome') and how it relates to chronic heart failure. It may help doctors understand why some people with heart failure do better than others and could lead to better treatments in the future.
Stanford, CaliforniaAges 18–75 - NCT05839938Enrolling by invitation
Vitamin D study for kids with allergic conjunctivitis
This trial studies whether vitamin D affects the surface of the eye, the eye’s normal germs, eye inflammation, and vision in children with allergic conjunctivitis. If vitamin D helps, it could improve symptoms and eye comfort.
TaichungAges 6–18 - NCT04885959Enrolling by invitation
Study how an Asian diet affects gut bacteria and allergy risk in pregnancy
This study looks at whether eating a traditional Asian diet during pregnancy changes gut bacteria and body chemistry in a way that may lower (or change) a baby’s risk of developing allergies. You would follow the diet during pregnancy and be tracked after delivery.
Kota Bharu, KelantanAges 18–40
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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.