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ClinicalTrials.gov public records Last synced Oct 21, 2026, 5:20 AM EDT

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Showing 25–48 of 483 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Microbiota Clear all
Completed Not applicable Interventional Accepts healthy volunteers Results available

Use of a Novel Synbiotic to Change Human Gut Bacteria and Improve Health in Obese Adults

NCT02355210
View directory record Official record
Conditions
Intestinal Microbiota and Barrier Function
Interventions
Bifidobacteria adolescentis BD1, Bifidobacteria animalis subsp. lactis BB-12, Bifidobacteria adolescentis BD1 and galactooligosaccharide, Bifidobacteria animalis subsp. lactis BB-12 and galactooligosaccharide, galactooligosaccharide, Placebo
Dietary Supplement
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
151 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 23, 2021 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Influence of Diet on GI Health

NCT04783142
View directory record Official record
Conditions
Healthy
Interventions
High-fiber, low-protein diet, Low-fiber, high-protein diet
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
2
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 15, 2023 · Synced Oct 21, 2026, 5:20 AM EDT
Recruiting Phase 1 Interventional

Feasibility, Safety, and Potential Efficacy of Fecal Microbiota Transplantation (FMT) for Gastrointestinal Dysfunction in Children Following Hematopoietic Cell Transplant (HCT).

NCT05664113
View directory record Official record
Conditions
Gastro-Intestinal Disorder
Interventions
Fecal microbiota transplant (FMT)
Drug
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
Up to 22 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 20, 2026 · Synced Oct 21, 2026, 5:20 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Developing Novel Microbiota-Targeted Therapies for Irritable Bowel Syndrome

NCT02249169
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2017
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 17, 2022 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Cherries Role in Gut Microbiota-liver-brain Function

NCT05586386
View directory record Official record
Conditions
Obesity
Interventions
Cherry group, Placebo group
Other
Lead sponsor
Texas A&M University
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Oct 19, 2022 · Synced Oct 21, 2026, 5:20 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Impact of Native Chicory Inulin on Change and Persistence of Gut Microbiota

NCT06528041
View directory record Official record
Conditions
Healthy
Interventions
Inulin, Maltodextrin
Other
Lead sponsor
Purdue University
Other
Eligibility
18 Years to 45 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Dec 11, 2025 · Synced Oct 21, 2026, 5:20 AM EDT
Not yet recruiting Not applicable Interventional

Open-Label Clinical Trial Evaluating the Impact of a Multi-Strain Commensal Probiotic Dietary Supplement on Gastrointestinal Microbiota Composition, Functional Gastrointestinal Markers, and Gastrointestinal Symptoms

NCT07720362
View directory record Official record
Conditions
Gastrointestinal, Microbiota
Interventions
Complete Commensal Probiotic
Dietary Supplement
Lead sponsor
OvationLab
Network
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jul 23, 2026 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Prebiotic and Probiotic Modulation of the Gut Microbiota-gut-brain Axis During Acute Stress

NCT05392556
View directory record Official record
Conditions
Stress Physiology
Interventions
Probiotic, Prebiotic, Placebo
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 39 Years
Enrollment
73 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 26, 2025 · Synced Oct 21, 2026, 5:20 AM EDT
Recruiting No phase listed Observational

Mucosal and Microbiota Changes During Acute Campylobacteriosis

NCT03223077
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 80 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2027
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 7, 2026 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Two Regimens, With Healthy Male and Female Babies, Ages 3-6 Months Old, Using Various Assessments.

NCT03457857
View directory record Official record
Conditions
Microbiome
Interventions
Cleanser, Cleanser and Lotion
Other
Lead sponsor
Johnson & Johnson Consumer Inc. (J&JCI)
Industry
Eligibility
3 Months to 6 Months
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Skillman, New Jersey
Source: ClinicalTrials.gov public record
Updated Aug 20, 2019 · Synced Oct 21, 2026, 5:20 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Grape Powder on Psychological Distress and Gut Microbiota in College Students

NCT07214428
View directory record Official record
Conditions
Gut Microbiota, Psychological Distress
Interventions
freeze-dried table grape powder, Placebo
Dietary Supplement
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 30 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Oct 21, 2026, 5:20 AM EDT
Active, not recruiting No phase listed Observational

A Cohort Study of the Intestinal Microbiota of Premature Infants

NCT03717584
View directory record Official record
Conditions
Necrotizing Enterocolitis, Bronchopulmonary Dysplasia, Growth Failure
Interventions
Not listed
Lead sponsor
University of California, Davis
Other
Eligibility
Up to 33 Weeks
Enrollment
300 participants
Timeline
2018 – 2027
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Apr 3, 2026 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Not applicable Interventional Results available

Effect of Milk Oligosaccharides and Bifidobacteria on the Intestinal Microflora of Children With Autism

NCT02086110
View directory record Official record
Conditions
Autism
Interventions
Synbiotic, Prebiotic
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
2 Years to 11 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Aug 1, 2019 · Synced Oct 21, 2026, 5:20 AM EDT
No Longer Available No phase listed Expanded access

Vancomycin and Fecal Microbiota Transplant in a Single Patient With Autism Spectrum Disorder

NCT04878718
View directory record Official record
Conditions
Autism Spectrum Disorder, Autism
Interventions
Fecal Microbiota Transplant; Vancomycin
Biological
Lead sponsor
ProgenaBiome
Other
Eligibility
2 Years and older
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Jun 8, 2025 · Synced Oct 21, 2026, 5:20 AM EDT
Completed No phase listed Observational

Precision Medicine for Preterm Birth

NCT02173210
View directory record Official record
Conditions
Premature Birth
Interventions
Not listed
Lead sponsor
University of Pennsylvania
Other
Eligibility
Female only
Enrollment
380 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
2
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 2, 2018 · Synced Oct 21, 2026, 5:20 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 13, 2022 · Synced Oct 21, 2026, 5:20 AM EDT
Recruiting Phase 2 Interventional

Fecal Microbiome Transplant to Remodel Intestinal Microbiota for Patients With Relapsed or Refractory Lymphoma With Exposure to High-Risk Antibiotics Who Are Receiving Chimeric Antigen Receptor T Cells

NCT07042438
View directory record Official record
Conditions
Recurrent Diffuse Large B-Cell Lymphoma, Recurrent High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements, Recurrent Transformed Follicular Lymphoma to Diffuse Large B-Cell Lymphoma, Refractory Diffuse Large B-Cell Lymphoma, Refractory High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements, Refractory Transformed Follicular Lymphoma to Diffuse Large B-Cell Lymphoma
Interventions
Axicabtagene Ciloleucel, Biospecimen Collection, Chemotherapy, Fecal Microbiota Transplantation, Leukapheresis, Placebo Administration
Biological · Procedure · Drug
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years and older
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Mar 5, 2026 · Synced Oct 21, 2026, 5:20 AM EDT
Not yet recruiting Phase 2 Interventional

Microbiota trAnSplant ThERaPy In hEpatiC Encephalopathy (MASTERPIECE)

NCT07528690
View directory record Official record
Conditions
Hepatic Encephalopathy, Cirrhosis
Interventions
Microbiota transplant therapy (MTT) capsules, Placebo capsule
Biological · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
21 Years and older
Enrollment
162 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2031
U.S. locations
3
States / cities
West Haven, Connecticut • Dallas, Texas • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Phase 1 Interventional

FMT for Postop Crohn's Disease

NCT05248191
View directory record Official record
Conditions
Crohn Disease
Interventions
Capsule fecal microbiota material (cap-FMT), Colonoscopic fecal microbiota material (colo-FMT)
Biological
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 17, 2025 · Synced Oct 21, 2026, 5:20 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 18, 2019 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Phase 1 Interventional

A Study to Evaluate Fecal Microbiota Transplantation Engraftment in IBS

NCT02847481
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
fecal microbiota transplantation, placebo fecal microbiota transplantation, FMT with antibiotic pre-treatment (v1), FMT with antibiotic pre-treatment (v2)
Procedure · Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 23, 2019 · Synced Oct 21, 2026, 5:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Dietary Fructose on Gut Microbiota and Fecal Metabolites in Obese Men and Postmenopausal Women: A Pilot Study

NCT03339245
View directory record Official record
Conditions
Non-Alcoholic Fatty Liver Disease, Obesity
Interventions
Fructose Solution (75 Grams), Glucose Solution (75 grams)
Other
Lead sponsor
Rockefeller University
Other
Eligibility
45 Years to 70 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 26, 2021 · Synced Oct 21, 2026, 5:20 AM EDT
Terminated Phase 1 Interventional

Placebo Controlled Study of Fecal Microbiota Transplant (FMT) for a First or Second Episode of C. Difficile Infection in Adults Using a Frozen Encapsulated Inoculum

NCT02343328
View directory record Official record
Conditions
Clostridium Difficile
Interventions
Fecal Microbiota Transplant, Placebo
Biological
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 13, 2017 · Synced Oct 21, 2026, 5:20 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Yogurt Supplementation to Alter Bone Biomarkers, the Gut Microbiota and Inflammation in Older Adults

NCT05350579
View directory record Official record
Conditions
Osteoporosis, Inflammation
Interventions
Yogurt Intervention
Other
Lead sponsor
University of Massachusetts, Lowell
Other
Eligibility
50 Years and older
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Lawrence, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 28, 2022 · Synced Oct 21, 2026, 5:20 AM EDT