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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Gastrointestinal Microbiome Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Antimicrobial-free Production of Beef Cattle's Affect on Gut Microbiome

NCT04023604
View directory record Official record
Conditions
Diet Modification
Interventions
Controlled diet with beef raised without antibiotics, Controlled diet with beef produced in conventional systems
Other
Lead sponsor
Purdue University
Other
Eligibility
21 Years to 69 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Sep 27, 2022 · Synced Sep 17, 2026, 3:26 AM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Human Milk Oligosaccharide-Based Synbiotic Supplement for Intestinal Microbiota Dysbiosis

NCT06615986
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Cardiosyn
Dietary Supplement
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
18 Years to 99 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Sep 17, 2026, 3:26 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Study of Human Brain-Gut Axis and Gut Microbiome in Patients With Brain Lesions - Repository for Neuroscience Research

NCT06117930
View directory record Official record
Conditions
Malignant Central Nervous System Neoplasm
Interventions
Non-Interventional Study
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2029
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 4, 2026 · Synced Sep 17, 2026, 3:26 AM EDT
Recruiting No phase listed Observational

Impact of Highly Effective Modulator Therapy on the Cystic Fibrosis Microbiome

NCT05982795
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Nasal endoscopy with microbiome swab and mucus collection through filter paper and sponge, Olfactory Function Testing, Survey Completion
Other
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years to 99 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Sep 17, 2026, 3:26 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Age-associated Arterial Dysfunction, Western Diet, and Aerobic Exercise: Role of the Gut Microbiome

NCT03334201
View directory record Official record
Conditions
Aging
Interventions
Western Diet, Non-Western Diet
Other
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
18 Years to 79 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Oct 27, 2021 · Synced Sep 17, 2026, 3:26 AM EDT
Terminated Phase 1Phase 2 Interventional Results available

Efficacy of Omega-3 Fatty Acid Therapy in Preventing Gastrointestinal Bleeding in Patients With CF-LVAD

NCT03784963
View directory record Official record
Conditions
Heart Failure, Gastrointestinal Bleeding
Interventions
Omega 3 fatty acids, Placebo
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 12, 2021 · Synced Sep 17, 2026, 3:26 AM EDT
Completed No phase listed Observational

Study of Gut Microbiome and Colorectal Tumors

NCT03297996
View directory record Official record
Conditions
Serrated Polyp, Hyperplastic Polyp, Sessile Serrated Adenoma, Colorectal Cancer
Interventions
Mobio PowerSoil DNA Isolation Kit
Diagnostic Test
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older
Enrollment
540 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 28, 2017 · Synced Sep 17, 2026, 3:26 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Microbiome and the Gut-Brain Axis

NCT02693327
View directory record Official record
Conditions
Mental Disorder
Interventions
Biological Sample, Blood Sample
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 80 Years
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
2
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 14, 2018 · Synced Sep 17, 2026, 3:26 AM EDT
Withdrawn No phase listed Observational

A Pilot Study to Explore the Role of Gut Flora in Epidermolysis Bullosa

NCT04213703
View directory record Official record
Conditions
Epidermolysis Bullosa, Epidermolysis Bullosa Simplex, Epidermolysis Bullosa Dystrophica
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 4, 2025 · Synced Sep 17, 2026, 3:26 AM 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 12, 2017 · Synced Sep 17, 2026, 3:26 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 24, 2023 · Synced Sep 17, 2026, 3:26 AM EDT
Recruiting No phase listed Observational

Impact of Gut Microbiome on Metabolic and Bowel Function During the First Year After Spinal Cord Injury

NCT05670288
View directory record Official record
Conditions
Spinal Cord Injuries, Gut Microbiome
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 85 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Dec 16, 2025 · Synced Sep 17, 2026, 3:26 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 22, 2026 · Synced Sep 17, 2026, 3:26 AM EDT
Withdrawn No phase listed Observational

A Non-Interventional Pilot Study to Explore the Role of Gut Flora in IBS

NCT04214470
View directory record Official record
Conditions
Irritable Bowel, Irritable Bowel Syndrome, Irritable Bowel Syndrome With Diarrhea, Irritable Bowel Syndrome Mixed, Irritable Bowel Syndrome With Constipation, Irritable Bowel Syndrome Without Diarrhea, Irritable Bowel Syndrome Aggravated, Irritable Bowel Syndrome Characterized by Constipation, Irritable Bowel Syndrome Characterised by Alternating Bowel Habit
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 4, 2025 · Synced Sep 17, 2026, 3:26 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D Intervention and Associated Changes in the Gut Microbiome and Vitamin D Levels in Healthy Adults

NCT05387876
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Vitamin D intervention, Placebo intervention
Dietary Supplement
Lead sponsor
Baylor University
Other
Eligibility
18 Years to 79 Years
Enrollment
43 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Waco, Texas
Source: ClinicalTrials.gov public record
Updated May 23, 2022 · Synced Sep 17, 2026, 3:26 AM EDT
Withdrawn No phase listed Observational

A Non-Interventional Pilot Study to Explore the Role of Gut Flora in Chronic Urinary Tract Infections (UTI)

NCT04100980
View directory record Official record
Conditions
Chronic UTI, Chronic Urinary Tract Infection
Interventions
No Intervention
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2030
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Jun 4, 2025 · Synced Sep 17, 2026, 3:26 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Gut Microbiome Studies in Patients With POEMS Syndrome and Other Plasma Cell Disorders

NCT06252948
View directory record Official record
Conditions
Plasma Cell Disorders
Interventions
Non-interventional study (observational)
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Sep 17, 2026, 3:26 AM EDT
Completed Phase 2 Interventional Results available

The Effect of an Antibiotic on the Production of Uremic Toxins by the Gut Microbiome

NCT03452189
View directory record Official record
Conditions
End Stage Renal Disease
Interventions
Vancomycin, Placebo
Drug · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 80 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 25, 2021 · Synced Sep 17, 2026, 3:26 AM EDT
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 22, 2021 · Synced Sep 17, 2026, 3:26 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

The Effects of Early Complementary Feeding on Growth, Neurodevelopment, Sleep and Gut Health

NCT04137445
View directory record Official record
Conditions
Linear Growth, Neurodevelopment, Gut Microbiome
Interventions
Baby Foods, Foods from the home
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
5 Months to 6 Months
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 1, 2023 · Synced Sep 17, 2026, 3:26 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Galactooligosaccharides (GOS) on the Gut Microbiota of Lactose Intolerance Individuals

NCT06915129
View directory record Official record
Conditions
Modulation of the Human Gut Microbiota by Prebiotic Galactooligosaccharides (GOS)
Interventions
Prebiotic galactooligosaccharides (GOS)
Dietary Supplement
Lead sponsor
Oregon State University
Other
Eligibility
19 Years to 55 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Corvallis, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 7, 2025 · Synced Sep 17, 2026, 3:26 AM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers Results available

Xanthohumol Metabolism and Signature

NCT03735420
View directory record Official record
Conditions
Healthy
Interventions
Xanthohumol, Placebo oral capsule
Drug
Lead sponsor
National University of Natural Medicine
Other
Eligibility
21 Years to 50 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2024
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Aug 26, 2024 · Synced Sep 17, 2026, 3:26 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Gallotannins on the Gut Microbiome and How it Affects Inflammatory Markers Among Obese Individuals.

NCT07505212
View directory record Official record
Conditions
Obesity (Disorder)
Interventions
Gallotannin-rich mango, Lactiplantibacillus pentosus (probiotic), No Treatment Added
Dietary Supplement · Other
Lead sponsor
Prairie View A&M University
Other
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Prairie View, Texas
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Sep 17, 2026, 3:26 AM EDT
Completed Not applicable Interventional

Tolerability Study of a Novel Microbiome Therapeutic in Subjects With Gastroesophageal Reflux Disease

NCT04491734
View directory record Official record
Conditions
Gastroesophageal Reflux
Interventions
maltosyl-isomalto-oligosaccharides (MIMO)
Dietary Supplement
Lead sponsor
ISOThrive Inc.
Industry
Eligibility
25 Years to 75 Years
Enrollment
156 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Manassas, Virginia
Source: ClinicalTrials.gov public record
Updated Aug 29, 2021 · Synced Sep 17, 2026, 3:26 AM EDT