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ClinicalTrials.gov public records Last synced Oct 21, 2026, 8:32 AM EDT

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Showing 1–24 of 667 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Gut Microbiota Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Adding Raisins to the American Diet on Fecal Microbiota Composition

NCT02713165
View directory record Official record
Conditions
Inflammation
Interventions
Raisins
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 75 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Sep 11, 2017 · Synced Oct 21, 2026, 8:32 AM EDT
Not listed Not applicable Interventional

Gastrointestinal Microbiome Study of Appendiceal Cancer

NCT02599116
View directory record Official record
Conditions
Pseudomyxoma Peritonei, Appendiceal Neoplasm, Cancer, Appendiceal
Interventions
Bio-specimen collection, Questionnaire
Other
Lead sponsor
Mercy Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 27, 2023 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Probiotics (L. Gasseri, B. Bifidum, B. Longum) on Immune and Intestinal Health in Healthy Older Adults

NCT01662206
View directory record Official record
Conditions
Healthy
Interventions
Probiotic, Placebo
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
65 Years to 80 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 17, 2013 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Microbiome Fructan Metabolism and Symptoms in Childhood IBS

NCT02842281
View directory record Official record
Conditions
Irritable Bowel Syndrome (IBS)
Interventions
Fructan, Maltodextrin
Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
7 Years to 17 Years
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 22, 2021 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional

Microbiota-targeted Diet for Pediatric UC

NCT02922881
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
Ulcerative Colitis Diet (UCD)
Other
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
8 Years to 19 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 22, 2021 · Synced Oct 21, 2026, 8:32 AM EDT
Withdrawn Phase 1 Interventional

Fecal Microbiota Transplantation for the Treatment of Severe Acute Gut Graft-Versus-Host Disease

NCT04280471
View directory record Official record
Conditions
Acute Graft Versus Host Disease, Gastrointestinal Tract Acute Graft Versus Host Disease, Severe Gastrointestinal Tract Acute Graft Versus Host Disease, Steroid Resistant Gastrointestinal Tract Acute Graft Versus Host Disease
Interventions
Fecal Microbiota Transplantation Capsule
Drug
Lead sponsor
Jonsson Comprehensive Cancer Center
Other
Eligibility
18 Years to 80 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Sep 22, 2023 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Consuming Red Meat on the Gut Microbiota in Young Adults

NCT03885544
View directory record Official record
Conditions
Diet Modification
Interventions
Controlled Lacto-ovo vegetarian diet, Controlled Unprocessed red meat diet, Controlled processed red meat diet
Other
Lead sponsor
Purdue University
Other
Eligibility
20 Years to 35 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Jul 14, 2020 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Anti-inflammatory Effect and Associated Mechanisms of Mango Consumption

NCT04726293
View directory record Official record
Conditions
Overweight or Obesity, Healthy
Interventions
Mango, Control
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
20 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 11, 2025 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Mediterranean-like Unprocessed (CLEAN-MED) Diet Intervention Study of the Gut Microbiome of Healthy Adults

NCT05411120
View directory record Official record
Conditions
Diet Therapy
Interventions
Western Diet, CLEAN-MED
Other
Lead sponsor
National Institutes of Health Clinical Center (CC)
NIH
Eligibility
18 Years to 60 Years
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 6, 2026 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional

A Growth and Hypoallergenicity Study of a New Formula for Infants With Cow Milk Allergy

NCT00664768
View directory record Official record
Conditions
Cow Milk Allergy
Interventions
Neocate Infant, new Neocate
Dietary Supplement
Lead sponsor
Nutricia North America
Industry
Eligibility
1 Day to 8 Months
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
22
States / cities
Chandler, Arizona • Tucson, Arizona • Bentonville, Arkansas + 18 more
Source: ClinicalTrials.gov public record
Updated Dec 9, 2020 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Blackcurrants Modify Gut Microbiota and Reduce Osteoporosis and CVD Risk

NCT04431960
View directory record Official record
Conditions
Postmenopausal Osteoporosis, Gut Microbiota, Cardiovascular Diseases
Interventions
blackcurrant (BC) extract
Drug
Lead sponsor
University of Connecticut
Other
Eligibility
45 Years to 60 Years · Female only
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 12, 2025 · Synced Oct 21, 2026, 8:32 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Gut-Brain Axis During Neurorehabilitation; Prebiotic Treatment to Alter the Gut Microbiome and Neurologic Symptoms

NCT06607523
View directory record Official record
Conditions
Brain Injuries
Interventions
Inulin
Dietary Supplement
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
18 Years and older
Enrollment
130 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 19, 2025 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Impact of Oligosaccharides and Bifidobacteria on the Intestinal Microflora of Premature Infants

NCT00810160
View directory record Official record
Conditions
Fecal Microflora in the Formula Fed Premature Infant
Interventions
ProlactPlus, GOS galacto-oligosaccharides, Bifidobacterium infantis, Bifidobacterium animalis
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
Not listed
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2015
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jul 13, 2017 · Synced Oct 21, 2026, 8:32 AM EDT
Terminated Not applicable Interventional

Fecal Microbiota Transplantation for Ulcerative Colitis

NCT01742754
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
Fecal Microbiota Transplantation
Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older · Female only
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Nov 13, 2013 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional

UC Cohort - The Influence of Diet on Gut Microbiotas

NCT04933162
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
High Protein and Low Fiber Diet, Low Protein and High Fiber Diet
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 25, 2023 · Synced Oct 21, 2026, 8:32 AM EDT
Recruiting No phase listed Observational

The Gut Microbiome and Serum Metabolites as a Biological Mechanism Underlying Pain in Kidney Transplantation

NCT06206486
View directory record Official record
Conditions
Kidney Transplant Symptoms, Gut Microbiome
Interventions
no intervention, observational
Other
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years and older
Enrollment
133 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Oct 21, 2026, 8:32 AM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Grape Impact on Human Gut Microbiome

NCT07797803
View directory record Official record
Conditions
Gut Microbiomes
Interventions
Grape Powder, Placebo Powder
Dietary Supplement · Other
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
45 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 24, 2026 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Pre-, Pro- & Anti-biotics on Gut Microbiota

NCT01414010
View directory record Official record
Conditions
Human Gut Microbiota
Interventions
Trametes versicolor extract, Saccharomyces boulardii, Amoxicillin
Dietary Supplement · Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 39 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 24, 2017 · Synced Oct 21, 2026, 8:32 AM EDT
Not listed Early Phase 1 Interventional

Fecal Microbiota Transplant in the Treatment of Ulcerative Colitis

NCT02390726
View directory record Official record
Conditions
Ulcerative Colitis, Active Moderate
Interventions
Fecal Microbiota Transplant, Placebo
Biological
Lead sponsor
University of Vermont
Other
Eligibility
18 Years to 75 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Jul 9, 2018 · Synced Oct 21, 2026, 8:32 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Smart Underwear to Measure Diet-Induced Hydrogen Sulfide Production

NCT06802276
View directory record Official record
Conditions
Hydrogen Sulfide, Gastrointestinal Microbiome
Interventions
High Cysteine Diet, Low Cysteine Diet
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Oct 19, 2026 · Synced Oct 21, 2026, 8:32 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, 8:32 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Stool Microbiome, Pathogens, and Infectious Agents Among Olympic and Elite Athletes

NCT02818413
View directory record Official record
Conditions
Athletic Performance
Interventions
Biospecimen collection and questionnaires
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 29, 2017 · Synced Oct 21, 2026, 8:32 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Personalized Responses to Dietary Composition Trial 3

NCT04735835
View directory record Official record
Conditions
Diabetes, Heart Diseases, Diet Habit, Diet Modification, Healthy, Obesity, Metabolism, Microbial Colonization
Interventions
Dietary Intervention
Other
Lead sponsor
Zoe Global Limited
Other
Eligibility
18 Years and older
Enrollment
250,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2030
U.S. locations
1
States / cities
Needham, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 16, 2025 · Synced Oct 21, 2026, 8:32 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, 8:32 AM EDT