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ClinicalTrials.gov public records Last synced Oct 25, 2026, 10:07 PM EDT

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Showing 481–504 of 680 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Intestinal Microbiome Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Metabolic and Bio-behavioral Effects of Following Recommendations in the Dietary Guidelines for Americans

NCT04293224
View directory record Official record
Conditions
Obesity, Body Weight
Interventions
DGA Mediterranean diet pattern, energy balance, DGA Mediterranean diet pattern, negative energy balance, TAD diet pattern, negative energy balance
Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
19 Years to 64 Years · Female only
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Sep 9, 2026 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Gut Flora Dependent Metabolism of Dietary Phosphatidylcholine and Cardiovascular Disease

NCT01519310
View directory record Official record
Conditions
Nutrition
Interventions
Antibiotic (metronidazole and ciprofloxacin)/probiotic
Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 3, 2016 · Synced Oct 25, 2026, 10:07 PM EDT
Active, not recruiting Early Phase 1 Interventional

The Gut, Liver And Metabolome in Human Immunodeficiency Virus and Non Alcoholic Fatty Liver Disease

NCT06113003
View directory record Official record
Conditions
HIV, Non-Alcoholic Fatty Liver Disease, Metabolic-Associated Steatotic Liver Disease
Interventions
Prebiotic, Probiotic
Dietary Supplement
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 89 Years
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Time-restricted Eating on Nutrient Absorption in Healthy Adults

NCT04877262
View directory record Official record
Conditions
Digestibility
Interventions
weight maintenance diet (WMD)
Other
Lead sponsor
Florida State University
Other
Eligibility
20 Years to 45 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Jun 23, 2022 · Synced Oct 25, 2026, 10:07 PM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Sjogren's Mini-Pill Oral and Gut Microbiome Study

NCT07732582
View directory record Official record
Conditions
Sjogren's Syndrome
Interventions
Mini-Pill
Device
Lead sponsor
Tufts University
Other
Eligibility
Not listed
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Oct 25, 2026, 10:07 PM EDT
Recruiting Phase 1 Interventional

Gut Permeability and Microbiome in Preterm Infants

NCT07667049
View directory record Official record
Conditions
Prematurity Complications
Interventions
measurement of intestinal permeability
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
Up to 4 Days
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Protein From Complementary Foods on Infant Growth, Body Composition and Gut Health

NCT02142647
View directory record Official record
Conditions
Infant Growth, Infant Body Fat, Infant Gut Microbiome
Interventions
a high-protein complementary diet with meat, a high-protein complementary diet with dairy
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
1 Month to 5 Months
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 10, 2019 · Synced Oct 25, 2026, 10:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Levodopa Response and Gut Microbiome in Patients With Parkinson's Disease

NCT04956939
View directory record Official record
Conditions
Parkinson Disease
Interventions
Low dose levodopa, High dose levodopa
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
40 Years to 80 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 7, 2022 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Impact of Proton Pump Inhibitors on the Fecal Microbiome

NCT01822977
View directory record Official record
Conditions
Healthy, Clostridium Difficile Infection
Interventions
omeprazole
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 20, 2014 · Synced Oct 25, 2026, 10:07 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Does Psychotherapy Change the Gut Microbiome in Women of Child-bearing Age?

NCT07200531
View directory record Official record
Conditions
Chronic Stress
Interventions
Psychotherapy
Behavioral
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years to 54 Years · Female only
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 25, 2026, 10:07 PM EDT
Completed No phase listed Observational

Genomic Research in Alpha-1 Antitrypsin Deficiency

NCT01832220
View directory record Official record
Conditions
Alpha 1 Antitrypsin Deficiency, AATD
Interventions
Not listed
Lead sponsor
University of Pittsburgh
Other
Eligibility
40 Years to 80 Years
Enrollment
140 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
9
States / cities
Tucson, Arizona • San Francisco, California • Denver, Colorado + 6 more
Source: ClinicalTrials.gov public record
Updated Jan 12, 2016 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

What's Hopping? Cricket Protein and Human Gut Microbiota

NCT03383341
View directory record Official record
Conditions
Healthy
Interventions
Cricket Protein Powder, Placebo control
Dietary Supplement · Other
Lead sponsor
Colorado State University
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Apr 4, 2019 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional

A Clinical Study to Assess the Effects of KB295 in Patients With Ulcerative Colitis (UC) on Gut Microbiota Structure and Function

NCT04508413
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
KB295
Other
Lead sponsor
Kaleido Biosciences
Industry
Eligibility
18 Years to 75 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
2
States / cities
Chicago, Illinois • Austin, Texas
Source: ClinicalTrials.gov public record
Updated Jan 24, 2022 · Synced Oct 25, 2026, 10:07 PM 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 29, 2017 · Synced Oct 25, 2026, 10:07 PM EDT
Withdrawn No phase listed Observational

A Pilot Study to Explore the Role of Gut Flora in Lupus

NCT04213690
View directory record Official record
Conditions
Lupus Erythematosus, Lupus Erythematosus, Systemic
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, 10:07 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 25, 2026, 10:07 PM EDT
Recruiting Phase 2 Interventional

Microbiome and Association With Implant Infections

NCT05020574
View directory record Official record
Conditions
Breast Cancer, Breast Cancer Female, Genetic Predisposition to Disease
Interventions
Cephalexin
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older · Female only
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Mar 18, 2026 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional

Edible Insects: Good for the Gut and the Globe

NCT06397924
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Chitin Fiber, Placebo
Dietary Supplement
Lead sponsor
Colorado State University
Other
Eligibility
18 Years and older
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 24, 2025 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional

Precision Pain Self-Management in Young Adults With Irritable Bowel Syndrome

NCT03332537
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Personalized IBS Pain SM
Behavioral
Lead sponsor
University of Connecticut
Other
Eligibility
18 Years to 29 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
2
States / cities
Farmington, Connecticut • Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 4, 2019 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Gut-level Antiinflammatory Activities of Green Tea in Metabolic Syndrome

NCT03973996
View directory record Official record
Conditions
Dysbiosis, Endotoxemia, Metabolic Syndrome, Inflammation
Interventions
Green Tea Extract, Placebo
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 65 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 19, 2025 · Synced Oct 25, 2026, 10:07 PM EDT
Recruiting Phase 2 Interventional

Modulation of the Gut Microbiome With Pembrolizumab Following Chemotherapy in Resectable Pancreatic Cancer

NCT05462496
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
Biopsy, FOLFIRINOX, Ciprofloxacin, Metronidazole, Pembrolizumab, Surgical Resection
Procedure · Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
19 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 15, 2024 · Synced Oct 25, 2026, 10:07 PM EDT
Completed Not applicable Interventional

Esophageal Atresia: a Natural Experiment of the Effects of Oral Inoculation on the Gut Microbiome

NCT04901546
View directory record Official record
Conditions
Esophageal Atresia
Interventions
Patient's own saliva
Other
Lead sponsor
Stanford University
Other
Eligibility
Up to 3 Months
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Apr 13, 2023 · Synced Oct 25, 2026, 10:07 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Gut Microbiomes in HD

NCT06448546
View directory record Official record
Conditions
Huntington Disease
Interventions
Not listed
Lead sponsor
University of Central Florida
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Jun 18, 2025 · Synced Oct 25, 2026, 10:07 PM EDT
Completed No phase listed Observational

Gut and Intratumoral Microbiome Effect on the Neoadjuvant Chemotherapy-induced Immunosurveillance in Triple Negative Breast Cancer

NCT03586297
View directory record Official record
Conditions
Triple Negative Breast Cancer
Interventions
Not listed
Lead sponsor
Hackensack Meridian Health
Other
Eligibility
18 Years and older · Female only
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2025
U.S. locations
3
States / cities
New Haven, Connecticut • Washington D.C., District of Columbia • Hackensack, New Jersey
Source: ClinicalTrials.gov public record
Updated Mar 27, 2026 · Synced Oct 25, 2026, 10:07 PM EDT