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ClinicalTrials.gov public records Last synced Oct 25, 2026, 11:18 AM EDT

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Showing 337–360 of 680 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Intestinal Microbiome Clear all
Completed Phase 1 Interventional

Vitamin D Regulation of Gut Specific B Cells and Antibodies Targeting Gut Bacteria in Inflammatory Bowel Disease

NCT04828031
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Ulcerative Colitis, Crohn Disease
Interventions
Vitamin D
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Sep 21, 2023 · Synced Oct 25, 2026, 11:18 AM EDT
Completed Phase 2 Interventional Results available

Prebiotics and Metformin Improve Gut and Hormones in Type 2 Diabetes in Youth (MIGHTY-fiber)

NCT04209075
View directory record Official record
Conditions
Diabetes
Interventions
Biomebliss, Metformin, Placebo
Dietary Supplement · Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
10 Years to 25 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 30, 2022 · Synced Oct 25, 2026, 11:18 AM EDT
Withdrawn No phase listed Observational

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

NCT04214548
View directory record Official record
Conditions
Eczema
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 5, 2025 · Synced Oct 25, 2026, 11:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessing the Dose Response of a Lead Fiber Snack Prototype

NCT04729816
View directory record Official record
Conditions
Microbiota, Gastrointestinal Microbiome
Interventions
Controlled, high fat/low fiber diet background diet, sequentially supplemented with an escalating dose of a fiber-blend snack food.
Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 60 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 27, 2024 · Synced Oct 25, 2026, 11:18 AM EDT
Withdrawn No phase listed Observational

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

NCT04100863
View directory record Official record
Conditions
Autism, Autism Spectrum Disorder, Autistic Disorder, Autism, Akinetic, Autism; Atypical, Autism; Psychopathy, Autism Fragile Syndrome X, Autism With High Cognitive Abilities, Autism-Related Speech Delay, Autism, Susceptibility to, 6, Autism Spectrum Disorder High-Functioning, Autistic Thinking, Autism, Susceptibility to, X-Linked 6, Autistic Behavior
Interventions
No Intervention
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
6 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 5, 2025 · Synced Oct 25, 2026, 11:18 AM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Comparing Sarecycline and Doxycycline Effects on the Skin and Gut Bacteria in Acne.

NCT07544251
View directory record Official record
Conditions
Acne Vulgaris
Interventions
Sarecycline, Doxycycline
Drug
Lead sponsor
Integrative Skin Science and Research
Industry
Eligibility
9 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Apr 22, 2026 · Synced Oct 25, 2026, 11:18 AM EDT
Completed Phase 2 Interventional Results available

Antibiotic "Dysbiosis" in Preterm Infants

NCT02784821
View directory record Official record
Conditions
Enterocolitis, Necrotizing, Bacteremia, Bronchopulmonary Dysplasia, Intraventricular Hemorrhage, Periventricular Leukomalacia, Chronic Lung Disease, Ileal Perforation
Interventions
Antibiotic, Gastric fluid, Breast milk, Stool samples, Antibiotics
Drug · Other
Lead sponsor
University of Florida
Other
Eligibility
23 Weeks to 33 Weeks
Enrollment
98 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 5, 2024 · Synced Oct 25, 2026, 11:18 AM EDT
Withdrawn No phase listed Observational

A Pilot Study to Explore the Role of Gut Flora in Parkinson's Disease

NCT04148326
View directory record Official record
Conditions
Parkinson Disease, Parkinsons Disease With Dementia, Parkinson-Dementia Syndrome, Parkinson Disease 2, Parkinson Disease 3, Parkinson Disease 4
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, 11:18 AM EDT
Recruiting Phase 1Phase 2 Interventional

Manipulation of the Gut Microbiome by a Standardized Preoperative Diet to Prevent Colorectal Cancer Recurrence and Metastasis Following Surgery

NCT06349590
View directory record Official record
Conditions
Colorectal Cancer
Interventions
High-fiber/low-fat meals
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 21, 2026 · Synced Oct 25, 2026, 11:18 AM EDT
Completed Not applicable Interventional Results available

A Dietary Intervention Study on the Microbiome in Crohn's Disease Patients

NCT04065048
View directory record Official record
Conditions
Crohn Disease
Interventions
Soy based diet, Non-soy based diet
Other
Lead sponsor
Case Western Reserve University
Other
Eligibility
18 Years to 65 Years
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Oct 25, 2026, 11:18 AM EDT
Recruiting Not applicable Interventional

Enhanced Nutritional Optimization in LVAD Trial

NCT05655910
View directory record Official record
Conditions
Heart Failure, Gut Microbiome, Nutritional Deficiency
Interventions
Ensure Surgery Immunonutrition shake
Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 31, 2025 · Synced Oct 25, 2026, 11:18 AM EDT
Recruiting Not applicable Interventional

Microbiome Modulation With Prebiotics in PTSD and Cirrhosis

NCT06464952
View directory record Official record
Conditions
Cirrhosis, PTSD
Interventions
Resistant potato starch, Powdered cellulose
Dietary Supplement
Lead sponsor
Hunter Holmes Mcguire Veteran Affairs Medical Center
Federal
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 9, 2026 · Synced Oct 25, 2026, 11:18 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Gut Butyrate and Blood Pressure in African Americans

NCT04415333
View directory record Official record
Conditions
Hypertension
Interventions
Sodium Butyrate 5 mmol, Sodium Butyrate 80 mmol
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
30 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Greensboro, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 18, 2023 · Synced Oct 25, 2026, 11:18 AM EDT
Recruiting Not applicable Interventional

Effects of Pomegranate Juice on Ulcerative Colitis

NCT07115862
View directory record Official record
Conditions
Ulcerative Colitis (Disorder)
Interventions
pomegranate juice -> habitual diet, habitual diet -> pomegranate juice
Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Dec 9, 2025 · Synced Oct 25, 2026, 11:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Randomized Controlled Trial Investigating if Antibiotic Use in the First 48 Hours of Life Adversely Impacts the Preterm Infant Microbiome

NCT02477423
View directory record Official record
Conditions
Premature Birth of Newborn, Enterocolitis, Necrotizing
Interventions
Ampicillin, Gentamicins, Placebo
Drug
Lead sponsor
University of Chicago
Other
Eligibility
Up to 6 Hours
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 8, 2020 · Synced Oct 25, 2026, 11:18 AM EDT
Completed Not applicable Interventional

Prebiotics, Gut Microbiota, and Cardiometabolic Health

NCT02346838
View directory record Official record
Conditions
Prediabetes
Interventions
Inulin, Placebo
Dietary Supplement
Lead sponsor
Virginia Polytechnic Institute and State University
Other
Eligibility
40 Years to 70 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Blacksburg, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 27, 2026 · Synced Oct 25, 2026, 11:18 AM EDT
Completed No phase listed Observational

Study of Oral Bacteria in Patients With Dry Mouth

NCT00048685
View directory record Official record
Conditions
Xerostomia, Autoimmune Diseases
Interventions
Not listed
Lead sponsor
National Institute of Dental and Craniofacial Research (NIDCR)
NIH
Eligibility
Not listed
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2004
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 4, 2008 · Synced Oct 25, 2026, 11:18 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Effects of Exercise & Tart Cherry Ingestion on Heat Acclimation and Gut Microbiome

NCT05281198
View directory record Official record
Conditions
Heat Acclimation and Thermotolerance
Interventions
tart cherry juice, Placebo
Dietary Supplement
Lead sponsor
Ohio University
Other
Eligibility
18 Years to 55 Years · Male only
Enrollment
4 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Athens, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 16, 2023 · Synced Oct 25, 2026, 11:18 AM EDT
Recruiting Not applicable Interventional

The Influence of Feeding Source on the Gut Microbiome and Time to Full Feeds in Neonates With Congenital Gastrointestinal Pathologies

NCT06072976
View directory record Official record
Conditions
Gastrointestinal Complication, Intestinal Obstruction, Gastroschisis, Hirschsprung Disease, Omphalocele, Midgut Volvulus
Interventions
Standard of Care, Exclusive Human Milk
Dietary Supplement
Lead sponsor
Seattle Children's Hospital
Other
Eligibility
0 Days to 55 Years
Enrollment
116 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Apr 30, 2026 · Synced Oct 25, 2026, 11:18 AM EDT
Recruiting Not applicable Interventional

Effects of Grape Consumption on the Immune-Gut Axis in Obesity

NCT07231484
View directory record Official record
Conditions
Obesity &Amp; Overweight
Interventions
Freeze-dried grape powder, Placebo powder
Other
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 60 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 31, 2026 · Synced Oct 25, 2026, 11:18 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 24, 2022 · Synced Oct 25, 2026, 11:18 AM EDT
Enrolling by invitation Not applicable Interventional

Glycemic Impact of NNS Via the Gut Microbiome

NCT07868432
View directory record Official record
Conditions
Prediabetes
Interventions
Sucralose
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
35 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 9, 2026 · Synced Oct 25, 2026, 11:18 AM EDT
Completed No phase listed Observational

Environmental Health Effects on Your Physiology

NCT03986814
View directory record Official record
Conditions
Obesity
Interventions
Not listed
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
18 Years to 25 Years
Enrollment
92 participants
Timeline
2019 – 2022
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Dec 9, 2024 · Synced Oct 25, 2026, 11:18 AM EDT
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 28, 2022 · Synced Oct 25, 2026, 11:18 AM EDT