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Showing 1–24 of 44 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Human Microbiota Clear all
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 12, 2026, 7:39 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 12, 2026, 7:39 PM 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 12, 2026, 7:39 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Bacterial Composition and Immune Responses in the Nose and Oropharynx During Influenza Infection

NCT02597647
View directory record Official record
Conditions
Influenza
Interventions
LAIV, Saline
Biological · Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 64 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Sep 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of Dietary Fiber on the Gut Microbiome and HDL Particles of Human Subjects

NCT03785860
View directory record Official record
Conditions
Gut Microbiota
Interventions
Dietary Fiber, Placebo
Other
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 45 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jan 7, 2021 · Synced Sep 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Acidophilus Pearls Fecal Recovery Study

NCT02001610
View directory record Official record
Conditions
Survival of Probiotics During GI Transit, GI Symptoms
Interventions
Acidophilus pearls, Hard shell gelatin capsules
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 75 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Feb 7, 2017 · Synced Sep 12, 2026, 7:39 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 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Trimethylamine-N-oxide Production and Metabolism

NCT02558673
View directory record Official record
Conditions
Healthy
Interventions
TMAO dietary precursors, Control (or active comparator)
Other
Lead sponsor
Cornell University
Other
Eligibility
21 Years to 50 Years · Male only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
2
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Nov 1, 2016 · Synced Sep 12, 2026, 7:39 PM 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 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional

Food Preparation Effects on Gut Bacteria in Patients on Peritoneal Dialysis

NCT02467530
View directory record Official record
Conditions
End Stage Renal Disease (ESRD)
Interventions
AGE
Other
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
103 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 18, 2017 · Synced Sep 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Resistant Starch Wheat for Improved Metabolic Health

NCT03082131
View directory record Official record
Conditions
Gut Microbiota, Metabolism, Metabolic Health
Interventions
Resistant Starch Wheat
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
40 Years to 65 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated May 6, 2019 · Synced Sep 12, 2026, 7:39 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 12, 2026, 7:39 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 12, 2026, 7:39 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 12, 2026, 7:39 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 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Novel Food Product Containing Microbiota Accessible Carbohydrates on the Human Microbiome

NCT03058575
View directory record Official record
Conditions
Gut Microbiome
Interventions
Dietary MACs, Control
Dietary Supplement · Other
Lead sponsor
Access Business Group
Industry
Eligibility
40 Years to 60 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Addison, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 22, 2018 · Synced Sep 12, 2026, 7:39 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 12, 2026, 7:39 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 3, 2019 · Synced Sep 12, 2026, 7:39 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 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Probiotics (L. Helveticus, B. Longum, and B. Bifidum) on Immune Function and Digestive Health

NCT01709825
View directory record Official record
Conditions
Healthy
Interventions
Probiotic- Bifidobacterium Bifidum, Sugar Pill, Probiotic- Lactobacillus helveticus, Probiotic- Bifidobacterium longum ss. Infantis R0033
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
18 Years and older
Enrollment
583 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 28, 2015 · Synced Sep 12, 2026, 7:39 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impacts of Fruit on the Gut Health and Human Health

NCT05063929
View directory record Official record
Conditions
Cardiometabolic Health, Healthy Aging, Cognition
Interventions
Fruit (2 cup eq), Fruit restriction (1/2 cup eq)
Other
Lead sponsor
San Diego State University
Other
Eligibility
30 Years to 70 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jan 7, 2025 · Synced Sep 12, 2026, 7:39 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 12, 2026, 7:39 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Pulses Consumption and Its Role in Managing Systemic Inflammation, Insulin Sensitivity and Gut Microbiome in Human

NCT04267705
View directory record Official record
Conditions
Insulin Sensitivity, Overweight or Obesity, Inflammatory Response
Interventions
Control, Black bean, Chickpea
Other
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
18 Years and older
Enrollment
103 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 27, 2026 · Synced Sep 12, 2026, 7:39 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 12, 2026, 7:39 PM EDT