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ClinicalTrials.gov public records Last synced Oct 23, 2026, 4:20 PM EDT

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Showing 49–72 of 680 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Intestinal Microbiome Clear all
Recruiting Phase 2 Interventional

Evaluation of Gixam's Performance in a FIT Negative Population

NCT06612281
View directory record Official record
Conditions
Colorectal Adenoma, Colorectal Cancer (CRC), Colorectal Cancer (CRC) Screening
Interventions
colorectal cancer (CRC) screening, colorectal cancer screening, Colonoscopy after bowel cleansing
Device · Diagnostic Test · Procedure
Lead sponsor
Jubaan Ltd.
Industry
Eligibility
45 Years to 85 Years
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 14, 2024 · Synced Oct 23, 2026, 4:20 PM EDT
Active, not recruiting No phase listed Observational

Hypoglycemia and the Gut Microbiome

NCT03385707
View directory record Official record
Conditions
Hypoglycemia
Interventions
Not listed
Lead sponsor
Joslin Diabetes Center
Other
Eligibility
18 Years to 65 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 6, 2026 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Phase 1 Interventional Results available

A Study to Evaluate the Safety, Tolerability and Microbiome Dynamics of SER-287 in Subjects With Mild-to-Moderate Ulcerative Colitis

NCT02618187
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
SER-287, Placebo, Placebo Pre-Treat, Vancomycin Pre-Treat
Drug
Lead sponsor
Seres Therapeutics, Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
58 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Marlborough, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 20, 2019 · Synced Oct 23, 2026, 4:20 PM EDT
Completed No phase listed Observational

Socioecological Factors Associated With Ethnic Disparities in Bariatric Surgery Utilization and Post-WLS

NCT06342050
View directory record Official record
Conditions
Obesity, Metabolic Syndrome
Interventions
Not listed
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 22, 2025 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional

The Inflammatory Bowel Disease - Anti-Inflammatory Diet (IBD-AID)

NCT04757181
View directory record Official record
Conditions
Inflammatory Bowel Diseases
Interventions
The IBD-AID
Other
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
15 Years and older
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Smart Underwear to Measure Diet-Induced Hydrogen Sulfide Production

NCT06802276
View directory record Official record
Conditions
Hydrogen Sulfide, Gastrointestinal Microbiome
Interventions
High Cysteine Diet, Low Cysteine Diet
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Oct 19, 2026 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional

Effects of Resistant Starch Diet on the Gut Microbiome in Chronic Kidney Disease

NCT03356990
View directory record Official record
Conditions
Chronic Kidney Diseases
Interventions
Resistant Starch
Dietary Supplement
Lead sponsor
University of Arkansas
Other
Eligibility
5 Years to 85 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Mar 7, 2025 · Synced Oct 23, 2026, 4:20 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Stool Microbiome, Pathogens, and Infectious Agents Among Olympic and Elite Athletes

NCT02818413
View directory record Official record
Conditions
Athletic Performance
Interventions
Biospecimen collection and questionnaires
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 29, 2017 · Synced Oct 23, 2026, 4:20 PM EDT
Completed No phase listed Observational

Comparison of Gut Microbiota, Inflammation and Symptoms Following Allogeneic HSCT

NCT02398708
View directory record Official record
Conditions
Graft vs Host Disease, Graft Versus Host Disease, Hematopoietic Stem Cell Transplantation, Peripheral Blood Stem Cell Transplantation
Interventions
Questionnaires, Blood Sample, Stool Sample, Clinical data
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years and older
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 25, 2019 · Synced Oct 23, 2026, 4:20 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Maternal Gut Microbiome (MGM) Study of Diet, the Gut Microbiome and Preterm Birth

NCT02560246
View directory record Official record
Conditions
Preterm Birth
Interventions
Not listed
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 2, 2018 · Synced Oct 23, 2026, 4:20 PM EDT
Recruiting Phase 2 Interventional

Trial Targeting Gut Bacterial Androgen Production to Reverse Therapeutic Resistance to Abiraterone in Patients With Metastatic Prostate Cancer

NCT06616597
View directory record Official record
Conditions
Prostate Cancer (Adenocarcinoma), Metastatic Prostate Cancer
Interventions
Abiraterone acetate, Dexamethasone, Metronidazole
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years and older · Male only
Enrollment
58 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2032
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 19, 2026 · Synced Oct 23, 2026, 4:20 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Cocoa-rich Bioflavanol Supplementation Effects During Cold Exposure

NCT04359082
View directory record Official record
Conditions
Cold Exposure, Manual Dexterity, Gut Microbiome
Interventions
CocoaVia supplement, Placebo Pill
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
18 Years to 49 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 30, 2021 · Synced Oct 23, 2026, 4:20 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 23, 2021 · Synced Oct 23, 2026, 4:20 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Understanding the Efficacy of Dietary Supplement on Fungal Mycobiota in Healthy Volunteers: A Pilot Study

NCT06433310
View directory record Official record
Conditions
Gut Microbiome, Gut Health, Dietary Supplement, L-Phenylalanine, Phenylpropionic Acid
Interventions
L-Phenylalanine 500 mg Veg Capsule product
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 26, 2026 · Synced Oct 23, 2026, 4:20 PM EDT
Withdrawn Phase 4 Interventional

Gut Microbiome Modulation to Enable Efficacy of Checkpoint-based Immunotherapy in Pancreatic Adenocarcinoma

NCT03891979
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
Pembrolizumab, Ciprofloxacin 500mg PO BID days 1-29, Metronidazole 500mg PO TID days 1-29
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Months to 100 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 26, 2020 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional

Sex Differences in Effectiveness of CBT on IBS Project 3

NCT05155631
View directory record Official record
Conditions
IBS - Irritable Bowel Syndrome
Interventions
COGNITIVE BEHAVIORAL THERAPY
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 55 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 16, 2025 · Synced Oct 23, 2026, 4:20 PM EDT
Not listed Phase 1 Interventional

The Gut-Brain Study

NCT03426826
View directory record Official record
Conditions
Autism Spectrum Disorder (ASD), Gastro-Intestinal Disorder
Interventions
FMT versus placebo
Biological
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
5 Years to 17 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 2, 2023 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Phase 2 Interventional Results available

The Effect of an Antibiotic on the Production of Uremic Toxins by the Gut Microbiome

NCT03452189
View directory record Official record
Conditions
End Stage Renal Disease
Interventions
Vancomycin, Placebo
Drug · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 80 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 26, 2021 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Effects of Xylooligosarcharide on Composition of the Human Colonic Microflora

NCT01861964
View directory record Official record
Conditions
Bifidobacteria, Healthy Volunteers
Interventions
Placebo (Maltodextrin), Xylooligosarcharide 1.4g, Xylooligosarcharide 2.8g
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
20 Years to 50 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 28, 2016 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional

Influences of High-fiber, Organic Whole-food Formula on the Gut Microbiome in Critically Ill Children

NCT03414775
View directory record Official record
Conditions
Critical Illness, Dysbiosis, Pediatric ALL
Interventions
Nourish, Pediasure
Other
Lead sponsor
University of Pittsburgh
Other
Eligibility
1 Year to 17 Years
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2025
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 12, 2026 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Evaluation of Changes to Skin Microbiome With Tape-Stripped Wounds

NCT03365934
View directory record Official record
Conditions
Healthy Volunteers
Interventions
ADHESIVE BANDAGE #1, ADHESIVE BANDAGE #2, ADHESIVE BANDAGE #3, Antibacterial Bandage with 0.8% BZK, Intact and No Bandage, Wounded and No Bandage
Device · Other
Lead sponsor
Johnson & Johnson Consumer Inc. (J&JCI)
Industry
Eligibility
18 Years to 55 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Fair Lawn, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 4, 2019 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Small Bowel Microbiota Characterization in Healthy Individuals Before and After Consumption of a Western Diet

NCT03266536
View directory record Official record
Conditions
Small Intestine Bacteria
Interventions
Western diet
Behavioral
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 4, 2022 · Synced Oct 23, 2026, 4:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

PREDICT 2: Personalized Responses to Dietary Composition Trial 2

NCT03983733
View directory record Official record
Conditions
Diabetes, Heart Diseases, Diet Habit, Diet Modification, Microbial Colonization, Healthy, Obesity, Metabolism
Interventions
Dietary Intervention
Other
Lead sponsor
Zoe Global Limited
Other
Eligibility
18 Years to 70 Years
Enrollment
1,139 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 18, 2022 · Synced Oct 23, 2026, 4:20 PM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

CVD 37000: Immunity and Microbiome Studies at Intestinal and Systemic Sites in Ty21a Vaccinated Adults

NCT03970304
View directory record Official record
Conditions
Typhoid Vaccination
Interventions
Vivotif Typhoid Oral Vaccine
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older
Enrollment
87 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 7, 2026 · Synced Oct 23, 2026, 4:20 PM EDT