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ClinicalTrials.gov public records Last synced Oct 25, 2026, 9:16 PM EDT

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Showing 457–480 of 680 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Intestinal Microbiome Clear all
Completed Not applicable Interventional

Clinical Food Study to Evaluate the Effect of KB174 on the Gut Microbiome in Subjects With Well-compensated Cirrhosis

NCT03855956
View directory record Official record
Conditions
Early Cirrhosis
Interventions
KB174, Maltodextrin
Other
Lead sponsor
Kaleido Biosciences
Industry
Eligibility
18 Years to 70 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
4
States / cities
Hollywood, Florida • Miami, Florida • Winter Park, Florida + 1 more
Source: ClinicalTrials.gov public record
Updated May 14, 2020 · Synced Oct 25, 2026, 9:16 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Military Health and Nutrition Examination Study

NCT06380322
View directory record Official record
Conditions
Hypertension, Type 2 Diabetes, Dyslipidemias, Cardiovascular Diseases
Interventions
Not listed
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years and older
Enrollment
648 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
6
States / cities
Fort Carson, Colorado • Hinesville, Georgia • Fort Campbell, Kentucky + 3 more
Source: ClinicalTrials.gov public record
Updated Jul 17, 2026 · Synced Oct 25, 2026, 9:16 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Genomic Tools for Studying the Ecology of the Human Vaginal Microflora

NCT00576797
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
Emory University
Other
Eligibility
12 Years to 45 Years · Female only
Enrollment
396 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
3
States / cities
Atlanta, Georgia • Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 2, 2016 · Synced Oct 25, 2026, 9:16 PM EDT
Recruiting No phase listed Observational

The Gut Microbiome and Immune Checkpoint Inhibitor Therapy in Solid Tumors

NCT05037825
View directory record Official record
Conditions
Non-Small-Cell Lung Carcinoma, Malignant Melanoma, Renal Cell Carcinoma, Triple-Negative Breast Cancer
Interventions
Checkpoint Inhibitor, Immune
Drug
Lead sponsor
VastBiome
Industry
Eligibility
18 Years and older
Enrollment
800 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2028
U.S. locations
1
States / cities
Elizabethtown, Kentucky
Source: ClinicalTrials.gov public record
Updated Apr 27, 2022 · Synced Oct 25, 2026, 9:16 PM EDT
Completed Not applicable Interventional

Effects of Curcumin Supplementation on Gut Barrier Function in Patients With Metabolic Syndrome

NCT03542240
View directory record Official record
Conditions
Obesity, High Blood Pressure, High Cholesterol, Type2 Diabetes, Heart Diseases
Interventions
Curcumin
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 26, 2021 · Synced Oct 25, 2026, 9:16 PM EDT
Recruiting Not applicable Interventional

Dietary Wild Blueberries and Joint Health

NCT06828159
View directory record Official record
Conditions
Gut -Microbiota, Inflammation Biomarkers, Pain Assessment, Joint Pain
Interventions
Wild blueberry, Placebo
Dietary Supplement
Lead sponsor
University of Nevada, Las Vegas
Other
Eligibility
40 Years to 75 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Nov 5, 2025 · Synced Oct 25, 2026, 9:16 PM EDT
Recruiting Phase 1Phase 2 Interventional

COffee and Metabolites Modulating the Gut MicrobiomE in Colorectal caNCER

NCT05692024
View directory record Official record
Conditions
Colorectal Cancer, Coffee, Gastrointestinal Microbiome, Stenosis, Fibrosis, Liver, Ultrasound Elastography, Proton Magnetic Resonance Spectroscopy
Interventions
Nestlé NESCAFÉ® TASTER'S CHOICE® House Blend capsule., Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 5, 2026 · Synced Oct 25, 2026, 9:16 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 25, 2026, 9:16 PM EDT
Completed Phase 1 Interventional Results available

Effect of Bismuth Subsalicylate on the Gut Microbiome and Host Response in Healthy Adults

NCT05930197
View directory record Official record
Conditions
Healthy Adults
Interventions
Bismuth subsalicylate
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 50 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Oct 25, 2026, 9:16 PM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Evaluating the Effects of a Fermented Diet on Microbiome Diversity in Individuals With Long COVID

NCT06560554
View directory record Official record
Conditions
Long COVID
Interventions
Fermented foods, Control
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Oct 25, 2026, 9:16 PM EDT
Active, not recruiting Not applicable Interventional

Can Gut Bacteria Predict Who Benefits Most From Exercise? A Gut Supplement to Help Exercise Non-Responders

NCT07180446
View directory record Official record
Conditions
Obesity &Amp; Overweight
Interventions
Cardiovascular Exercise, Butyrate
Behavioral · Dietary Supplement
Lead sponsor
Texas Christian University
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Fort Worth, Texas
Source: ClinicalTrials.gov public record
Updated Sep 29, 2026 · Synced Oct 25, 2026, 9:16 PM EDT
Completed Not applicable Interventional

Exercise, Gut Microbiome, and Breast Cancer: Increasing Reach to Underserved Populations

NCT05000502
View directory record Official record
Conditions
Female Breast Cancer
Interventions
Home-based exercise intervention
Behavioral
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 70 Years · Female only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Mar 22, 2024 · Synced Oct 25, 2026, 9:16 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

The Gut and Skin Microbiome in Vitiligo Disease Progression

NCT03577327
View directory record Official record
Conditions
Vitiligo, Healthy
Interventions
Not listed
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 89 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 9, 2026 · Synced Oct 25, 2026, 9:16 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 25, 2026, 9:16 PM EDT
Completed Not applicable Interventional Results available

Berries, Bugs, and the Blues

NCT05817383
View directory record Official record
Conditions
Depressive Symptoms
Interventions
Freeze-dried Blueberry Powder, Placebo Powder
Other
Lead sponsor
Hebrew SeniorLife
Other
Eligibility
65 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Roslindale, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 22, 2025 · Synced Oct 25, 2026, 9:16 PM EDT
Completed Phase 2 Interventional Results available

MTT for Children With Both Pitt Hopkins Syndrome and Gastrointestinal Disorders

NCT04132427
View directory record Official record
Conditions
Pitt Hopkins Syndrome
Interventions
vancomycin, magnesium citrate, microbiota, placebo vancomycin, real magnesium citrate, placebo microbiota
Combination Product
Lead sponsor
Arizona State University
Other
Eligibility
7 Years to 17 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 26, 2024 · Synced Oct 25, 2026, 9:16 PM EDT
Recruiting Not applicable Interventional

Wild Blueberries for Gut, Brain, and Cardiometabolic Health in Prediabetes

NCT06735651
View directory record Official record
Conditions
Prediabetes (Insulin Resistance, Impaired Glucose Tolerance), Female, Adult, Endothelial Function (Reactive Hyperemia), Arterial Stiffness, Cognition, Oxidative Stress, Gut Microbiota, Overweight, Inflammation, Microvascular Function, Body Composition
Interventions
Wild Blueberry, Placebo
Dietary Supplement
Lead sponsor
Georgia State University
Other
Eligibility
20 Years to 65 Years · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Oct 25, 2026, 9:16 PM EDT
Withdrawn No phase listed Observational

Evaluation of Intestinal Microbiome in Obese Kids

NCT00816296
View directory record Official record
Conditions
Obesity, Non-Alcoholic Fatty Liver Disease
Interventions
Blood Draw, Stool collection, BodPod Measurement, Liver Ultrasound
Other
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
5 Years to 18 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 24, 2015 · Synced Oct 25, 2026, 9:16 PM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Gut Microbiome Response to Long-Haul Travel in Elite Football Players

NCT07585474
View directory record Official record
Conditions
Microbial Composition, Immune Function
Interventions
Probiotic Capsule, Placebo
Drug
Lead sponsor
Sheffield Hallam University
Other
Eligibility
18 Years to 40 Years · Male only
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Oct 25, 2026, 9:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

FlaxFx, A Research Study of the Effects of Flaxseed Lignans on Colon Health

NCT01619020
View directory record Official record
Conditions
Healthy
Interventions
Flaxseed Lignans
Dietary Supplement
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
20 Years to 45 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 13, 2017 · Synced Oct 25, 2026, 9:16 PM EDT
Withdrawn No phase listed Observational

A Pilot Study to Explore the Role of Gut Flora in Multiple Sclerosis

NCT04148313
View directory record Official record
Conditions
Multiple Sclerosis, MS
Interventions
No Intervention
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
Not listed
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2030
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Jun 5, 2025 · Synced Oct 25, 2026, 9:16 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Infant Restore: Efficacy of Microbiome Analysis and Education

NCT06424691
View directory record Official record
Conditions
Microbiota, Eczema, Microbiome, Gut Microbiome
Interventions
Tailored Recommendations, Consult Call, Email Series
Dietary Supplement · Behavioral
Lead sponsor
Seeding Inc
Industry
Eligibility
0 Months to 3 Months
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Fredericksburg, Texas
Source: ClinicalTrials.gov public record
Updated May 22, 2024 · Synced Oct 25, 2026, 9:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ergogenic Properties of Magnesium Supplementation

NCT05282693
View directory record Official record
Conditions
Exercise Performance, Gut -Microbiota, Mitochondrial Function
Interventions
ReMag, Placebo
Dietary Supplement
Lead sponsor
Christopher Bell
Other
Eligibility
18 Years to 40 Years
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated May 16, 2024 · Synced Oct 25, 2026, 9:16 PM EDT
Completed No phase listed Observational

Oral Aromatase Inhibitors Modify the Gut Microbiome

NCT05030038
View directory record Official record
Conditions
Breast Cancer
Interventions
Fecal swab collection, Blood samples
Biological
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Oct 25, 2026, 9:16 PM EDT