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Showing 1–24 of 646 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Gut Microbiomes Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Dairy Fat and Fermentation Study

NCT05840081
View directory record Official record
Conditions
Heart Diseases, Microbial Colonization, Inflammation
Interventions
Milk or yogurt beverage
Other
Lead sponsor
Tufts University
Other
Eligibility
50 Years and older
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 11, 2025 · Synced Sep 4, 2026, 11:36 PM EDT
Recruiting Not applicable Interventional

Wild Blueberries for Gut, Brain, and Heart Health in Adults With High Blood Pressure

NCT06735599
View directory record Official record
Conditions
Hypertension (Without Type 2 Diabetes Mellitus), High Blood Pressure, Male, Female, Adult, Cognition, Endothelial Function (Reactive Hyperemia), Oxidative Stress, Diet, Overweight, Body Composition Measurement, Gut Microbiome, Arterial Stiffness, Caucasian Whites, Inflammation, Microvascular Function
Interventions
Wild Blueberry, Placebo
Dietary Supplement
Lead sponsor
Georgia State University
Other
Eligibility
45 Years to 65 Years
Enrollment
40 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 1, 2026 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

PREDICT 2: Personalized Responses to Dietary Composition Trial 2

NCT03983733
View directory record Official record
Conditions
Diabetes, Heart Diseases, Diet Habit, Diet Modification, Microbial Colonization, Healthy, Obesity, Metabolism
Interventions
Dietary Intervention
Other
Lead sponsor
Zoe Global Limited
Other
Eligibility
18 Years to 70 Years
Enrollment
1,139 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 17, 2022 · Synced Sep 4, 2026, 11:36 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Berries, Inflammation, and Gut Microbiome

NCT04100200
View directory record Official record
Conditions
Overweight or Obesity, Healthy
Interventions
Mixed berries, FOS, Control, Combination
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
20 Years to 60 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Phase 2 Interventional Results available

NBT-NM108 as an Early Treatment for Suspected or Confirmed Symptomatic COVID-19 Patients

NCT04540406
View directory record Official record
Conditions
Suspected or Confirmed COVID-19
Interventions
NBT-NM108, Usual Care Only
Drug · Other
Lead sponsor
Notitia Biotechnologies Company
Industry
Eligibility
18 Years to 79 Years
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Oct 7, 2024 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of a Commercially Available Synbiotic on the Gut Microbiome and Cardiometabolic Health

NCT07515443
View directory record Official record
Conditions
Hypertension, Gut Dysbiosis, Overweight , Obesity
Interventions
Synbiotic, Placebo
Dietary Supplement
Lead sponsor
Southern Utah University
Other
Eligibility
18 Years to 60 Years
Enrollment
47 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Cedar, Utah
Source: ClinicalTrials.gov public record
Updated Jul 28, 2026 · Synced Sep 4, 2026, 11:36 PM 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 4, 2026, 11:36 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
U.S. locations
1
States / cities
Fort Worth, Texas
Source: ClinicalTrials.gov public record
Updated May 26, 2026 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Diet / Gut Microbiome Interaction and Influence on Inflammatory Disease in HIV Patients

NCT02610374
View directory record Official record
Conditions
HIV
Interventions
Agrarian Diet, Western-type Diet
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 65 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 20, 2022 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Trial to Assess the Effects of an Antimicrobial Mouthwash on the Esophageal Microbiome

NCT02513784
View directory record Official record
Conditions
Esophageal Adenocarcinoma, Barrett's Esophagus, Reflux Esophagitis
Interventions
Chlorhexidine gluconate
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 21, 2022 · Synced Sep 4, 2026, 11:36 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 12, 2026 · Synced Sep 4, 2026, 11:36 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Walnut Consumption and Gut Microbiota

NCT05441748
View directory record Official record
Conditions
Obesity, Inflammation
Interventions
Walnuts, Walnut Oil, Control
Other
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
25 Years to 75 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 17, 2023 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of a Novel Nutritional Product on Nutrient Gaps and Gut Health in Adults With Occasional Gastrointestinal Issues

NCT06564285
View directory record Official record
Conditions
Gastrointestinal Microbiome, Nutrition, Healthy
Interventions
AG1 - Nutritional Supplement, Placebo
Dietary Supplement
Lead sponsor
Athletic Greens International
Industry
Eligibility
18 Years to 60 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated May 3, 2025 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Phase 4 Interventional Results available

Antibiotic Resistance In Eye Surgeries

NCT04750655
View directory record Official record
Conditions
Antibiotic Resistance, Ocular Surface Microbiome, Gut Resistome
Interventions
Moxifloxacin (Topical)
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 85 Years
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Mar 27, 2025 · Synced Sep 4, 2026, 11:36 PM EDT
Terminated Phase 2 Interventional Results available

Pembrolizumab and EDP1503 in Advanced Melanoma

NCT03595683
View directory record Official record
Conditions
Melanoma (Skin), Melanoma
Interventions
Pembrolizumab, EDP1503
Drug · Biological
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 7, 2025 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Understanding the Role of Gut Microbiota in Hyperphagia in Prader-Willi Syndrome

NCT05541003
View directory record Official record
Conditions
Prader-Willi Syndrome, Obesity
Interventions
NBT-NM108
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 35 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Jul 15, 2024 · Synced Sep 4, 2026, 11:36 PM EDT
Not listed No phase listed Observational

Gut Microbiome and Ventricular Arrhythmias

NCT04466072
View directory record Official record
Conditions
Ventricular Tachycardia, Ventricular Fibrillation, Gut Microbiome
Interventions
Stool test for microbial analysis
Diagnostic Test
Lead sponsor
North Florida Foundation for Research and Education
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 17, 2022 · Synced Sep 4, 2026, 11:36 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Gastrointestinal And Metabolic Effects From a Prebiotic, Lifting, and Aerobic iNtervention

NCT05207488
View directory record Official record
Conditions
Overweight and Obesity
Interventions
Fructooligosaccharides (FOS), Exercise, Placebo
Dietary Supplement · Behavioral
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
20 Years to 45 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 9, 2022 · Synced Sep 4, 2026, 11:36 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 12, 2017 · Synced Sep 4, 2026, 11:36 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effects of Intravenous (IV) Omadacycline on Gut Microbiome

NCT05515562
View directory record Official record
Conditions
Microbial Colonization
Interventions
Omadacycline Injection
Drug
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 40 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 16, 2025 · Synced Sep 4, 2026, 11:36 PM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

The Effect of Therapeutic Fecal Transplant on the Gut Microbiome in Children With Ulcerative Colitis

NCT02291523
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
Fecal Microbial Transplant
Biological
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
7 Years to 21 Years
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 1, 2023 · Synced Sep 4, 2026, 11:36 PM EDT
Completed No phase listed Observational

Microbiome, Antibiotics, and Growth Infant Cohort

NCT03001167
View directory record Official record
Conditions
Obesity, Childhood, Antibiotic Side Effect
Interventions
Not listed
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
Up to 96 Hours
Enrollment
509 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 11, 2024 · Synced Sep 4, 2026, 11:36 PM EDT
Completed No phase listed Observational

Gastrointestinal Microbiome Influence on the Development of Bronchopulmonary Dysplasia

NCT03229967
View directory record Official record
Conditions
Bronchopulmonary Dysplasia
Interventions
16S rRNA stool microbiome sequencing.
Diagnostic Test
Lead sponsor
University of Tennessee
Other
Eligibility
0 Days to 7 Days
Enrollment
197 participants
Timeline
2017 – 2020
U.S. locations
2
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated May 9, 2023 · Synced Sep 4, 2026, 11:36 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

LpD3.5 Intervention Study in Older Adults- LISA-I Trial

NCT07794956
View directory record Official record
Conditions
Mild Cognitive Impairment (MCI), Cognition, Brain Aging, Microbiome Dysbiosis, Leaky Gut Syndrome, Gut Inflammation, Inflammaging
Interventions
LpD3.5, Placebo
Dietary Supplement
Lead sponsor
University of South Florida
Other
Eligibility
60 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Aug 30, 2026 · Synced Sep 4, 2026, 11:36 PM EDT