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Showing 25–44 of 20 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Human Microbiota Clear all
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Impact of Dietary Intervention on Inflammation and Microbiome Composition Post-Colonoscopy

NCT06603519
View directory record Official record
Conditions
Colorectal Polyp, Inflammation, Dietary Intervention, Microbiota, Colorectal Neoplasms, Metabolomics
Interventions
Modified Plant-Based Mediterranean Diet
Dietary Supplement
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated May 4, 2026 · Synced Sep 17, 2026, 11:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of S. Boulardii and Amoxicillin/Clavulanate on Gut Microbiota

NCT01473368
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Saccharomyces boulardii, Amoxicillin Clavulanate
Dietary Supplement · Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 3, 2017 · Synced Sep 17, 2026, 11:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Dietary Fiber on Fecal Microbiota and Metabolism

NCT01518088
View directory record Official record
Conditions
Focus of the Study is on Gut Health
Interventions
Dietary Fiber
Dietary Supplement
Lead sponsor
Ingredion Incorporated
Industry
Eligibility
20 Years to 60 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 20, 2016 · Synced Sep 17, 2026, 11:07 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Gut Microbiota-Mediated Inflammatory Interactions Between AUD and HIV Infection

NCT06139224
View directory record Official record
Conditions
Alcohol Use Disorder, Human Immunodeficiency Virus
Interventions
4 week prebiotic consumption, 4 week placebo consumption
Dietary Supplement · Other
Lead sponsor
Rush University Medical Center
Other
Eligibility
45 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2029
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 3, 2026 · Synced Sep 17, 2026, 11:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Galactooligosaccharide, Immune Strength, and Digestive Health in Older Adults Over Cold and Flu Season

NCT01302561
View directory record Official record
Conditions
Healthy
Interventions
Sucrose, Galactooligosaccharide
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
60 Years and older
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Aug 1, 2012 · Synced Sep 17, 2026, 11:07 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Potential Restoration of the Infant Microbiome

NCT02407184
View directory record Official record
Conditions
Human Microbiome
Interventions
Newborn exposure to mother vaginal microbiota
Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 40 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 11, 2018 · Synced Sep 17, 2026, 11:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Almond Consumption on the Human Gastrointestinal Microbiota and Metabolic Health

NCT04223323
View directory record Official record
Conditions
Overweight and Obesity
Interventions
Almonds, Pretzels
Dietary Supplement
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
30 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 5, 2024 · Synced Sep 17, 2026, 11:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

USDA Western Human Nutrition Research Center (WHNRC) Cross-Sectional Nutritional Phenotyping Study

NCT02367287
View directory record Official record
Conditions
Obesity, Inflammation
Interventions
Not listed
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 65 Years
Enrollment
393 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Sep 17, 2026, 11:07 PM EDT
Not yet recruiting Phase 4 Interventional

Impact of Probiotics on Gut Microbiome During Antibiotic Prophylaxis in Elective Orthopedic Surgery

NCT06791993
View directory record Official record
Conditions
Dysbiosis, Gut -microbiota, Microbiome Analysis, Probiotic, Antibiotic Prophylaxis
Interventions
Placebo Capsule, Probiotic with Human Milk Oligosaccharides (HMO)
Drug · Dietary Supplement
Lead sponsor
Acibadem Maslak Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 23, 2025 · Synced Sep 17, 2026, 11:07 PM EDT
Completed Not applicable Interventional Results available

Impacts of Lentils on Metabolism and Inflammation

NCT04283448
View directory record Official record
Conditions
Hypertriglyceridemia, Inflammation, Waist, Hypertriglyceridemic
Interventions
Dietary Lentil, Control
Behavioral
Lead sponsor
Montana State University
Other
Eligibility
18 Years to 70 Years
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Bozeman, Montana
Source: ClinicalTrials.gov public record
Updated Dec 12, 2024 · Synced Sep 17, 2026, 11:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Gut Microbiome Pill

NCT07243756
View directory record Official record
Conditions
Healthy
Interventions
3D-printed ingestible pill
Device
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 3, 2026 · Synced Sep 17, 2026, 11:07 PM 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, 11:07 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 17, 2026, 11:07 PM 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, 11:07 PM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Optimization of Collection Methods for Studies of the Human Microbiota

NCT03731702
View directory record Official record
Conditions
Microbial Composition
Interventions
Not listed
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years to 100 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Rockville, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 27, 2020 · Synced Sep 17, 2026, 11:07 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Implications of the Human Microbiota for Health and Disease

NCT04203303
View directory record Official record
Conditions
Human Microbiota
Interventions
Observational
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
5,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2030
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Sep 17, 2026, 11:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Role of Dietary Titanium Dioxide on the Human Gut Microbiome and Health

NCT05864352
View directory record Official record
Conditions
Inflammation, Microbiota, Gastrointestinal Irritation
Interventions
Not listed
Lead sponsor
University of Massachusetts, Lowell
Other
Eligibility
18 Years to 30 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Lowell, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 6, 2024 · Synced Sep 17, 2026, 11:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Choline Source, Gut Microbiota and Trimethylamine-N-oxide Response

NCT04255368
View directory record Official record
Conditions
Metabolism
Interventions
Water-soluble choline, Fat-soluble choline, No choline control
Other
Lead sponsor
Utah State University
Other
Eligibility
21 Years to 50 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Logan, Utah
Source: ClinicalTrials.gov public record
Updated Nov 3, 2020 · Synced Sep 17, 2026, 11:07 PM EDT
Completed No phase listed Observational

Interactions of Environmental and Human Microbial Communities in a Pediatric Oncology Hospital

NCT02948335
View directory record Official record
Conditions
Infection
Interventions
Not listed
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
Not listed
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 19, 2018 · Synced Sep 17, 2026, 11:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Sources of Bacterial Contamination in Human Milk Samples From the MiLC Trial

NCT03371511
View directory record Official record
Conditions
Bacterial Communities
Interventions
Not listed
Lead sponsor
Cornell University
Other
Eligibility
18 Years and older · Female only
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Jan 13, 2019 · Synced Sep 17, 2026, 11:07 PM EDT