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ClinicalTrials.gov public records Last synced Oct 18, 2026, 4:14 AM EDT

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Showing 1–24 of 93 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Human Microbiome Clear all
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Choline From Eggs vs. Supplements on the Generation of TMAO in Humans

NCT03039023
View directory record Official record
Conditions
Cardiovascular Risk Factor
Interventions
Choline Bitartrate, Pre-cooked, pre-peeled whole hardboiled eggs, Egg whites from pre-cooked, pre-peeled hardboiled eggs, Phosphatidylcholine capsules
Dietary Supplement · Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
86 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 13, 2026 · Synced Oct 18, 2026, 4:14 AM 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 7, 2024 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Effects of Crofelemer on the Gut Microbiome in Healthy Volunteers and in HIV+ Patients With Non-Infectious Diarrhea

NCT04192487
View directory record Official record
Conditions
Acquired Immunodeficiency Syndrome, Healthy Volunteers, HIV/AIDS, HIV Diarrhea, Human Immunodeficiency Virus
Interventions
Crofelemer delayed-release tablets 125mg
Drug
Lead sponsor
Napo Pharmaceuticals, Inc.
Industry
Eligibility
18 Years and older
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
3
States / cities
Tustin, California • Stratford, Connecticut • Springfield, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 22, 2021 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Longitudinal Study of the Human Intestinal Microbiome

NCT00832286
View directory record Official record
Conditions
Dysbacteriosis
Interventions
Ciprofloxacin
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 45 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 29, 2021 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

WHNRC (Western Human Nutrition Research Center) Fiber Intervention Study

NCT04543877
View directory record Official record
Conditions
Inflammation, Vaccine, Intestinal Permeability, Typhoid Fever
Interventions
Inulin, Maltodextrin, Ty21a Typhoid Fever Vaccine
Dietary Supplement · Biological
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 59 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Dec 17, 2025 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Human Microbiome and Healthcare Associated Infections - Nursing Home Dwelling Older Veterans

NCT04218799
View directory record Official record
Conditions
Human Microbiome
Interventions
Intranasal Mupirocin and Topical Chlorhexidine
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
50 Years and older
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
2
States / cities
Baltimore, Maryland • Perry Point, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 6, 2023 · Synced Oct 18, 2026, 4:14 AM 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 23, 2018 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Phase 4 Interventional

NICU Antibiotics and Outcomes Trial

NCT03997266
View directory record Official record
Conditions
Microbial Colonization, Extreme Prematurity, Early-Onset Neonatal Sepsis, Late-Onset Neonatal Sepsis, Necrotizing Enterocolitis of Newborn, Death; Neonatal
Interventions
Ampicillin, Gentamycin, Normal saline
Drug
Lead sponsor
Michael Morowitz
Other
Eligibility
Up to 4 Hours
Enrollment
359 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
14
States / cities
Mobile, Alabama • San Diego, California • New Haven, Connecticut + 10 more
Source: ClinicalTrials.gov public record
Updated Apr 24, 2026 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Mechanism of Microbiome-induced Insulin Resistance in Humans (Aim2)

NCT02127125
View directory record Official record
Conditions
Insulin Sensitivity
Interventions
Maltodextrin, Synbiotic, Sevelamer
Drug
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
18 Years to 65 Years
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Sep 11, 2020 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Not applicable Interventional

Oropharyngeal Administration of Mother's Colostrum for Premature Infants (NS-72393-360)

NCT02116699
View directory record Official record
Conditions
Infection, Enterocolitis, Necrotizing, Ventilator-associated Pneumonia
Interventions
oropharyngeal mother's milk, oropharyngeal sterile water
Other
Lead sponsor
Endeavor Health
Other
Eligibility
1 Day to 4 Days
Enrollment
260 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2022
U.S. locations
5
States / cities
Miami, Florida • Evanston, Illinois • Park Ridge, Illinois + 2 more
Source: ClinicalTrials.gov public record
Updated Mar 1, 2023 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Systems Biology of Flu Vaccine in Healthy Adults With and Without the Use of Antibiotics

NCT02154061
View directory record Official record
Conditions
Influenza
Interventions
IIV Flu Vaccine, Metronidazole, Neomycin, Vancomycin
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years to 40 Years
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 15, 2018 · Synced Oct 18, 2026, 4:14 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Reducing Metabolic Dysregulation in Dyads

NCT06117241
View directory record Official record
Conditions
Colorectal Cancer, Inflammation, Nutrition Related Cancer
Interventions
IMAGINE HEALTHY
Behavioral
Lead sponsor
University of South Carolina
Other
Eligibility
9 Years to 55 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2028
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Jan 29, 2026 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Not applicable Interventional

Combining HIIT and n-3 PUFA to Reduce Inflammation and Improve Metabolic Health

NCT05295719
View directory record Official record
Conditions
Obesity, Inflammation, Human Microbiome, Insulin Resistance, Dyslipidemias
Interventions
Omega-3 polyunsaturated fatty acid, High-Intensity Interval Training, Safflower oil, Low-intensity training
Dietary Supplement · Behavioral
Lead sponsor
Texas Tech University
Other
Eligibility
18 Years to 65 Years
Enrollment
129 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Sep 11, 2025 · Synced Oct 18, 2026, 4:14 AM 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 18, 2026, 4:14 AM 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 12, 2018 · Synced Oct 18, 2026, 4:14 AM 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 24, 2025 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Predicting Adenomatous Polyps in the Colon Using Images of a Human Tongue

NCT06305364
View directory record Official record
Conditions
Colorectal Neoplasms, Gastrointestinal Microbiome
Interventions
Gixam
Device
Lead sponsor
Jubaan Ltd.
Industry
Eligibility
18 Years to 75 Years
Enrollment
426 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
3
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 20, 2025 · Synced Oct 18, 2026, 4:14 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Kimchi and Gut Health

NCT07435831
View directory record Official record
Conditions
Healthy Adult Participants
Interventions
60 grams per day of intervention food
Other
Lead sponsor
University of California, Davis
Other
Eligibility
19 Years to 70 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2029
U.S. locations
2
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Human Pilot Study - HA35 (Hyaluronan Molecular Weight 35) Dietary Supplement for Promoting Intestinal Health

NCT02867605
View directory record Official record
Conditions
Gastrointestinal Microbiome
Interventions
Hyaluronan
Dietary Supplement
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 45 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 3, 2020 · Synced Oct 18, 2026, 4:14 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Effects of Natural Sugars in Breast Milk on Healthy Infant Growth and Development

NCT04434027
View directory record Official record
Conditions
Obesity
Interventions
Not listed
Lead sponsor
University of Southern California
Other
Eligibility
18 Years to 59 Years · Female only
Enrollment
221 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 28, 2025 · Synced Oct 18, 2026, 4:14 AM 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 2, 2016 · Synced Oct 18, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Oral Pomegranate Extract on the Microbiome and Skin Biophysical Properties

NCT04596722
View directory record Official record
Conditions
Human Microbiome
Interventions
Pomella, Placebo
Dietary Supplement · Other
Lead sponsor
Integrative Skin Science and Research
Industry
Eligibility
25 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Apr 13, 2021 · Synced Oct 18, 2026, 4:14 AM 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 19, 2017 · Synced Oct 18, 2026, 4:14 AM 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 14, 2019 · Synced Oct 18, 2026, 4:14 AM EDT