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Showing 1–24 of 472 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Microbiota Clear all
Not listed Phase 2 Interventional

Gut Microbiota Changes After Fecal Microbiota Transplantation

NCT02557685
View directory record Official record
Conditions
Clostridium Difficile Infection
Interventions
Fecal Microbiota Transplantation
Biological
Lead sponsor
The Miriam Hospital
Other
Eligibility
18 Years to 90 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Sep 22, 2015 · Synced Jul 22, 2026, 3:44 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Enfamil NeuroPro Study

NCT06059209
View directory record Official record
Conditions
Infant Development, Infant ALL
Interventions
Enfamil NeuroPro, Enfamil Infant
Dietary Supplement
Lead sponsor
University of Arizona
Other
Eligibility
0 Months to 4 Months
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Dec 10, 2025 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Effect of Estrogen Treatment on Drug Metabolism and Transport

NCT05469204
View directory record Official record
Conditions
Transgender Persons
Interventions
Midazolam oral solution, Digoxin Oral Tablet, Acetaminophen Oral Tablet, Midazolam Injectable Solution
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 55 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jan 8, 2026 · Synced Jul 22, 2026, 3:44 AM EDT
Completed No phase listed Observational

Gastrointestinal Microbiome Influence on the Development of Bronchopulmonary Dysplasia

NCT03229967
View directory record Official record
Conditions
Bronchopulmonary Dysplasia
Interventions
16S rRNA stool microbiome sequencing.
Diagnostic Test
Lead sponsor
University of Tennessee
Other
Eligibility
0 Days to 7 Days
Enrollment
197 participants
Timeline
2017 – 2020
U.S. locations
2
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated May 9, 2023 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The RAMP Study - Rejuvenation of the Aging Microbiota With Prebiotics

NCT03690999
View directory record Official record
Conditions
Microbiome, Immune Function, Inflammation
Interventions
Placebo, Prebiotic supplement
Dietary Supplement
Lead sponsor
Stanford University
Other
Eligibility
60 Years and older
Enrollment
98 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Feb 16, 2023 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Addition of Whole Grains to the Diets of Middle-school Children

NCT01094652
View directory record Official record
Conditions
Healthy
Interventions
Whole grain diet, Refined grain diet
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
11 Years to 15 Years
Enrollment
83 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Aug 1, 2012 · Synced Jul 22, 2026, 3:44 AM EDT
Recruiting Phase 1Phase 2 Interventional

Vaginal Microbiota Transplant

NCT04046900
View directory record Official record
Conditions
Recurrent Bacterial Vaginosis
Interventions
Vaginal microbiome transplant, Oral Metronidazole, Sterile saline
Biological · Drug · Other
Lead sponsor
Douglas Kwon
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 5, 2026 · Synced Jul 22, 2026, 3:44 AM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Vaginal Microbiome Seeding and Health Outcomes in Cesarean-delivered Neonates.

NCT03298334
View directory record Official record
Conditions
Cesarean Delivery Affecting Newborn, Obesity, Childhood, Intestinal Microbiome, Microbiota, Host Microbial Interactions, Gastrointestinal Microbiome
Interventions
Vaginal Seeding, No Vaginal Seeding
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
0 Days to 50 Years
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2029
U.S. locations
1
States / cities
Falls Church, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 7, 2025 · Synced Jul 22, 2026, 3:44 AM EDT
Recruiting Phase 1 Interventional

A Placebo-controlled, Randomized Clinical Trial to Assess the Safety, Feasibility, and Pharmacokinetics of Microbiota Transplant Therapy With Antibiotic Preconditioning and Fiber Supplementation in Patients With Pulmonary Arterial Hypertension

NCT06481852
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
MTT with antibiotic preconditioning + fiber supplementation, MTT with antibiotic preconditioning + placebo supplementation, MTT with placebo + placebo supplementation.
Drug · Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 75 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 14, 2025 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Not applicable Interventional

Vitamin D and Microbiota in Cystic Fibrosis

NCT02589444
View directory record Official record
Conditions
Vitamin D Deficiency, Cystic Fibrosis
Interventions
High-Dose Vitamin D3, Stool Sample, Sputum Sample, Sham Comparator, Blood draw
Dietary Supplement · Other · Procedure
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 13, 2017 · Synced Jul 22, 2026, 3:44 AM EDT
Active, not recruiting Phase 2 Interventional

Microbiota Transfer Therapy for Adults With Autism Spectrum Disorder (ASD) Who Have Gastrointestinal Disorders

NCT03408886
View directory record Official record
Conditions
Autism Spectrum Disorder, Gastrointestinal Disorder
Interventions
Vancomycin, MoviPrep, Full Spectrum Microbiota
Drug · Biological
Lead sponsor
Arizona State University
Other
Eligibility
18 Years to 60 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Jan 8, 2023 · Synced Jul 22, 2026, 3:44 AM EDT
Active, not recruiting Early Phase 1 Interventional

Fecal Microbiota Transplant for Autobrewery Syndrome

NCT06083142
View directory record Official record
Conditions
Auto-Brewery Syndrome, Gut Fermentation Syndrome
Interventions
Fecal microbiota transplantation capsules
Biological
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2030
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced Jul 22, 2026, 3:44 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Gut Microbiota Post Roux-en-Y Gastric Bypass Surgery

NCT02654496
View directory record Official record
Conditions
Obesity
Interventions
Meal challenge
Other
Lead sponsor
North Dakota State University
Other
Eligibility
18 Years to 65 Years · Female only
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Fargo, North Dakota
Source: ClinicalTrials.gov public record
Updated Aug 22, 2018 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effects of a Vaginal Contraceptive Ring on Vaginal Microbiota and Local Immunity

NCT02432404
View directory record Official record
Conditions
Bacterial Vaginosis
Interventions
NuvaRing
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
81 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Feb 4, 2025 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Dietary Flavonoids on Intestinal Microbiota, Intestinal Inflammation and Metabolic Syndrome

NCT02728570
View directory record Official record
Conditions
Metabolic Syndrome X, Inflammation
Interventions
High Dietary Flavonoids, Low Dietary Flavonoids
Other
Lead sponsor
Utah State University
Other
Eligibility
18 Years to 70 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Logan, Utah
Source: ClinicalTrials.gov public record
Updated Apr 14, 2016 · Synced Jul 22, 2026, 3:44 AM EDT
Completed No phase listed Observational

Effects of Chemotherapy on Intestinal Bacteria in Patients With Newly Diagnosed Breast Cancer

NCT02370277
View directory record Official record
Conditions
Ductal Breast Carcinoma In Situ, Invasive Breast Carcinoma, Stage I Breast Cancer, Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer
Interventions
Cytology Specimen Collection Procedure, Laboratory Biomarker Analysis, Questionnaire Administration
Other
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older · Female only
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 17, 2019 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Phase 1 Interventional

FMT In High-Risk Acute GVHD After ALLO HCT

NCT04139577
View directory record Official record
Conditions
Acute Graft-Versus-Host Disease (Gvhd) Grade, Hematopoietic Cell Transplantation, Fecal Microbiota Transplant
Interventions
Fecal Microbiota Transplant
Biological
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 6, 2024 · Synced Jul 22, 2026, 3:44 AM EDT
Not listed Phase 2 Interventional

Fecal Microbiota Transplant and Pembrolizumab for Men With Metastatic Castration Resistant Prostate Cancer.

NCT04116775
View directory record Official record
Conditions
Prostate Cancer, Prostate Cancer Metastatic
Interventions
Fecal microbiota transplant, Pembrolizumab, Enzalutamide
Biological · Drug
Lead sponsor
Julie Graff, MD
Federal
Eligibility
18 Years and older · Male only
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 22, 2022 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Dietary Milk Polar Lipids on Serum Cholesterol and Gut Microbiota in Healthy Adults

NCT04208815
View directory record Official record
Conditions
Serum Cholesterol, Gut Microbiome
Interventions
Milk Polar Lipids, Milk Fat
Other
Lead sponsor
University of Connecticut
Other
Eligibility
18 Years to 50 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 12, 2022 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Salty Gut: Effects of High Dietary Salt Intake on the Gut Microbiota

NCT04229680
View directory record Official record
Conditions
Cardiovascular Risk Factor
Interventions
High Salt, Recommended Salt
Other
Lead sponsor
University of Delaware
Other
Eligibility
18 Years to 45 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated Oct 1, 2023 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Phase 1 Interventional

Fecal Microbiota Transplant for Relapsing Clostridium Difficile Infection in Adults and Children Using a Frozen Encapsulated Inoculum

NCT01914731
View directory record Official record
Conditions
Clostridium Difficile Infection
Interventions
Fecal Microbiota Transplant
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
7 Years to 90 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 18, 2016 · Synced Jul 22, 2026, 3:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ellagic Acid, Urolithin and Colonic Microbial Communities Affected by Walnut Consumption

NCT04066816
View directory record Official record
Conditions
Colo-rectal Cancer, Colon Cancer, Diet Habit
Interventions
Walnuts
Other
Lead sponsor
UConn Health
Other
Eligibility
50 Years to 65 Years
Enrollment
47 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 25, 2021 · Synced Jul 22, 2026, 3:44 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Milk Oriented Microbiota

NCT03222804
View directory record Official record
Conditions
Microbial Colonization
Interventions
Bifidobacterium
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
21 Years to 45 Years · Female only
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Dec 10, 2024 · Synced Jul 22, 2026, 3:44 AM EDT
Active, not recruiting Phase 2 Interventional

Autologous Fecal Microbiota Transplantation (Auto-FMT) for Prophylaxis of Clostridium Difficile Infection in Recipients of Allogeneic Hematopoietic Stem Cell Transplantation

NCT02269150
View directory record Official record
Conditions
Allogeneic Hematopoietic Stem Cell
Interventions
fecal microbiota transplantation (FMT), No fecal microbiota transplantation (FMT), routine management
Biological · Other
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 16, 2025 · Synced Jul 22, 2026, 3:44 AM EDT