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ClinicalTrials.gov public records Last synced Oct 21, 2026, 3:58 PM EDT

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Showing 145–168 of 483 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Microbiota Clear all
Active, not recruiting Phase 1Phase 2 Interventional

Intestinal Microbiota Transplant in Alcohol-Associated Liver Disease

NCT05548452
View directory record Official record
Conditions
Liver Disease; Alcohol-Related, Cirrhosis, Alcohol Use Disorder
Interventions
Intestinal Microbiota Transplant (IMT) Capsules, Placebo Capsules
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
2
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Aug 24, 2026 · Synced Oct 21, 2026, 3:58 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Exploratory/Proof of Principle Microbiota Study

NCT02500563
View directory record Official record
Conditions
Fecal Microbiota
Interventions
Amino acid based infant formula, Extensively hydrolyzed casein infant formula, Mother's own breast milk
Other
Lead sponsor
Mead Johnson Nutrition
Industry
Eligibility
1 Day to 7 Days
Enrollment
78 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Jul 28, 2017 · Synced Oct 21, 2026, 3:58 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Phage 3Determination of Phage/Probiotic Synergistic Effects on Gastrointestinal Health

NCT05750433
View directory record Official record
Conditions
Gastrointestinal Dysfunction
Interventions
PreforPro+B. subtilis DE111 probiotics, Placebo, B. subtilis DE111
Dietary Supplement
Lead sponsor
Colorado State University
Other
Eligibility
18 Years to 75 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 27, 2024 · Synced Oct 21, 2026, 3:58 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Night Owl Sleep Study: The Effect of Sleep on Fecal Microbiota

NCT07243574
View directory record Official record
Conditions
Sleep
Interventions
Increase sleep by 90 minutes, Decrease sleep by 90 minutes
Behavioral
Lead sponsor
Danisco
Industry
Eligibility
20 Years to 40 Years
Enrollment
174 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
3
States / cities
Miami, Florida • Boston, Massachusetts • Garden City, New York
Source: ClinicalTrials.gov public record
Updated Oct 15, 2026 · Synced Oct 21, 2026, 3:58 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Healthy Patients & Effect of Antibiotics

NCT03098485
View directory record Official record
Conditions
Microbiota, Anti-bacterial Agents
Interventions
Levofloxacin, Azithromycin, Cefpodoxime
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
21 Years to 60 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Nov 10, 2022 · Synced Oct 21, 2026, 3:58 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Healthy Volunteer Short Chain Fatty Acid Study

NCT05254340
View directory record Official record
Conditions
Healthy
Interventions
Inulin
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 75 Years
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Sep 25, 2024 · Synced Oct 21, 2026, 3:58 PM EDT
Recruiting Not applicable Interventional

Capillary Endoscopy Aspiration Catheter

NCT04418258
View directory record Official record
Conditions
Microbiota, SIBO
Interventions
Capillary Endoscopy Aspiration Catheter, Endoscopy Aspiration Catheter
Device
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 85 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 26, 2026 · Synced Oct 21, 2026, 3:58 PM EDT
Completed No phase listed Observational Results available

Growth and Microbiome Development in Very Low Birth Weight Infants Fed Primarily Mother's Own Milk vs. Donor Human Milk

NCT02573779
View directory record Official record
Conditions
Infant, Very Low Birth Weight
Interventions
Observational - no intervention
Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
Up to 3 Days
Enrollment
125 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 25, 2025 · Synced Oct 21, 2026, 3:58 PM EDT
Completed Phase 2 Interventional Results available

Examining the Efficacy of Fecal Microbiota Transplantation (FMT) and Dietary Fiber in Patients With Ulcerative Colitis

NCT03998488
View directory record Official record
Conditions
Ulcerative Colitis, Inflammatory Bowel Diseases
Interventions
Fecal Microbiota Transplantation, Psyllium Husk Powder
Drug · Dietary Supplement
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 89 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 3, 2025 · Synced Oct 21, 2026, 3:58 PM EDT
Completed Phase 2 Interventional Results available

Preventing Diabetic Foot Ulcers Through Cleaner Feet

NCT03503370
View directory record Official record
Conditions
Diabetic Foot Ulcer
Interventions
Chlorhexidine, Placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
175 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 9, 2024 · Synced Oct 21, 2026, 3:58 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Differences Between Breastfed and Formula Fed Infants

NCT03493711
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
Arkansas Children's Hospital Research Institute
Other
Eligibility
2 Months to 3 Months
Enrollment
158 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Sep 25, 2026 · Synced Oct 21, 2026, 3:58 PM 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 15, 2016 · Synced Oct 21, 2026, 3:58 PM EDT
Recruiting Phase 1 Interventional

A Pilot Study of Microbiota Transplant With Antibiotic Preconditioning and Fiber Supplementation in Pulmonary Arterial Hypertension (GUT RESTORE-PAH)

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 Jul 31, 2026 · Synced Oct 21, 2026, 3:58 PM 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 26, 2021 · Synced Oct 21, 2026, 3:58 PM EDT
Terminated Phase 2 Interventional Results available

Penn Microbiome Therapy for Recurrent Clostridium Difficile Infection

NCT03973697
View directory record Official record
Conditions
Recurrent Clostridium Difficile Infection
Interventions
Penn Microbiome Therapy - 001, Penn Microbiome Therapy - 002, Penn Microbiome Therapy - 003
Drug
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 1, 2023 · Synced Oct 21, 2026, 3:58 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Capsule Microbiota Sampling in IBS/Functional Gastrointestinal Disease

NCT06215222
View directory record Official record
Conditions
IBS - Irritable Bowel Syndrome, Healthy, Functional Bloating, Functional Gastrointestinal Disorders
Interventions
Microbiota Sampling
Other
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 70 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Redwood City, California
Source: ClinicalTrials.gov public record
Updated Jan 22, 2024 · Synced Oct 21, 2026, 3:58 PM EDT
Terminated Phase 2 Interventional Results available

Safety of FMT: OpenBiome Outcomes and Longitudinal Follow-up (STOOL) for Recurrent Clostridium Difficile Infection

NCT02403622
View directory record Official record
Conditions
Clostridium Difficile
Interventions
Fecal Microbiota Preparation
Drug
Lead sponsor
Microbiome Health Research Institute
Other
Eligibility
18 Years to 75 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
4
States / cities
Naperville, Illinois • Indianapolis, Indiana • Boston, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Feb 23, 2021 · Synced Oct 21, 2026, 3:58 PM EDT
Terminated Phase 2 Interventional Results available

FMT Versus Antimicrobials for Initial Treatment of Recurrent CDI

NCT02255305
View directory record Official record
Conditions
Clostridium Difficile Infection
Interventions
FMT, Antimicrobials
Biological · Drug
Lead sponsor
Endeavor Health
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
1
States / cities
Evanston, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 3, 2023 · Synced Oct 21, 2026, 3:58 PM EDT
Enrolling by invitation Not applicable Interventional

Impact of an Arginine-containing Toothpaste on the Subgingival Microbiota in Patients in Supportive Periodontal Care

NCT07755800
View directory record Official record
Conditions
Gum Disease
Interventions
Arginine Toothpaste, Fluoride Toothpaste
Device
Lead sponsor
Sukirth M Ganesan, BDS, PhD
Other
Eligibility
18 Years to 95 Years
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Oct 21, 2026, 3:58 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Effect of a Fermented Dairy Protein With Prebiotic Fiber on GI Complaints

NCT06946017
View directory record Official record
Conditions
Digestive Health, Quality of Life
Interventions
Fermented dairy protein with prebiotic fiber supplement, Control placebo
Dietary Supplement
Lead sponsor
Arizona State University
Other
Eligibility
18 Years to 50 Years
Enrollment
114 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated May 8, 2026 · Synced Oct 21, 2026, 3:58 PM EDT
Active, not recruiting Early Phase 1 Interventional Accepts healthy volunteers

FMT in Uncomplicated Diverticulitis

NCT05373784
View directory record Official record
Conditions
Diverticulitis, Uncomplicated Diverticular Disease
Interventions
Fecal Microbiota Transplantation (FMT)
Biological
Lead sponsor
Justin Maykel
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Oct 21, 2026, 3:58 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Adding Chickpeas to the American Diet on Fecal Microbiota Composition and Markers of Inflammation

NCT02375347
View directory record Official record
Conditions
Inflammation
Interventions
Chickpea Enhanced Diet (Short term)
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 75 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 30, 2016 · Synced Oct 21, 2026, 3:58 PM EDT
Recruiting Phase 2 Interventional

Evaluation of Microbiota Transplant Therapy in Patients With Alopecia Areata

NCT06747611
View directory record Official record
Conditions
Alopecia Areata, Alopecia Totalis, Alopecia Universalis
Interventions
Vancomycin, Neomycin and MTT capsules, Placebo capsules
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 26, 2026 · Synced Oct 21, 2026, 3:58 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Gut Microbiota, Short Chain Fatty Acids, and Adiposity Across The Epidemiological Transition

NCT03378765
View directory record Official record
Conditions
Obesity, Diabetes
Interventions
Diet and physical activity monitoring
Behavioral
Lead sponsor
Loyola University
Other
Eligibility
18 Years to 50 Years
Enrollment
2,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2025
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 19, 2024 · Synced Oct 21, 2026, 3:58 PM EDT