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ClinicalTrials.gov public records Last synced Oct 17, 2026, 6:04 PM EDT

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Showing 1–24 of 666 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Gut -Microbiota Clear all
Completed No phase listed Observational

Gut Microbiota in Intestinal Barrier Damage in Acute Leukemia Patients Undergoing Inpatient Induction

NCT03316456
View directory record Official record
Conditions
Chemotherapy-Induced Gut Barrier Damage, Acute Leukemia
Interventions
Observational: Stool Sample Collection, Observational: Blood Sample Collection, Observational: Urine Sample Collection
Diagnostic Test
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
18 Years to 99 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated May 6, 2019 · Synced Oct 17, 2026, 6:04 PM EDT
Recruiting No phase listed Observational

Assess Diversity of Gut Microbiome in Met NSCLC in Correlation to Tx & Adverse Effects

NCT06221800
View directory record Official record
Conditions
Non Small Cell Lung Cancer
Interventions
Microbiome
Diagnostic Test
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years and older
Enrollment
82 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Orange, California
Source: ClinicalTrials.gov public record
Updated Feb 5, 2026 · Synced Oct 17, 2026, 6:04 PM EDT
Active, not recruiting Not applicable Interventional

Gut Microbe Composition, Exercise, and Breast Breast Cancer Survivors

NCT04088708
View directory record Official record
Conditions
Breast Cancer, Gut Microbiome, Exercise, Fatigue
Interventions
Aerobic Exercise Training, Attention Control
Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 74 Years · Female only
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 16, 2025 · Synced Oct 17, 2026, 6:04 PM EDT
Completed Not applicable Interventional

Effect of Curcumin on Gut Microbiota in IBS

NCT03568513
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Curcumin, Placebo
Dietary Supplement
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
10 Years to 18 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 21, 2021 · Synced Oct 17, 2026, 6:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Blueberry Intake and Infant Gut Health

NCT05006989
View directory record Official record
Conditions
Infant Development
Interventions
Blueberry Powder, Placebo Powder
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
4 Months to 5 Months
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Apr 30, 2025 · Synced Oct 17, 2026, 6:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Metabolic Response to Chardonnay Grape Marc Powder

NCT03203915
View directory record Official record
Conditions
Dyslipidemia, Obesity
Interventions
Chardonnay grape marc marc high polyphenol dose (120mg), Chardonnay grape marc powder low polyphenol dose (75mg), Placebo (0mg)
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
35 Years to 65 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jul 16, 2021 · Synced Oct 17, 2026, 6:04 PM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

The Effect of Therapeutic Fecal Transplant on the Gut Microbiome in Children With Ulcerative Colitis

NCT02291523
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
Fecal Microbial Transplant
Biological
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
7 Years to 21 Years
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 2, 2023 · Synced Oct 17, 2026, 6:04 PM EDT
Terminated Not applicable Interventional

Evaluating the Effects of an Exercise Intervention on the Gut Microbiota in Stage II-III Colorectal Cancer Survivors

NCT05930496
View directory record Official record
Conditions
Stage II Colorectal Cancer AJCC v8, Stage III Colorectal Cancer AJCC v8, Colorectal Carcinoma
Interventions
Biospecimen Collection, Exercise Intervention, Health Education, Interview, Questionnaire Administration
Procedure · Other · Behavioral
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
18 Years to 70 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Oct 17, 2026, 6:04 PM EDT
Recruiting No phase listed Observational

Impact of Gut Microbiome on Metabolic and Bowel Function During the First Year After Spinal Cord Injury

NCT05670288
View directory record Official record
Conditions
Spinal Cord Injuries, Gut Microbiome
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 85 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Dec 17, 2025 · Synced Oct 17, 2026, 6:04 PM EDT
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 17, 2026, 6:04 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Polyphenols and Cognitive Decline

NCT06507254
View directory record Official record
Conditions
Cognitive Decline, Cognitive Dysfunction
Interventions
Polyphenol Supplement, Placebo Supplement
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
50 Years and older
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Oct 17, 2026, 6:04 PM EDT
Withdrawn No phase listed Observational

A Pilot Study to Explore the Role of Gut Flora in Chronic Constipation

NCT04148248
View directory record Official record
Conditions
Constipation, Constipation Chronic Idiopathic, Constipation - Functional, Constipation (Excl Faecal Impaction)
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 17, 2026, 6:04 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 7, 2024 · Synced Oct 17, 2026, 6:04 PM 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 17, 2026, 6:04 PM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Novel Listeria Vectors Secreting Gut Flora-Altering Agents to Prevent Colon Cancer and Treat Colitis

NCT03014284
View directory record Official record
Conditions
Colon Cancer, Colitis
Interventions
Not listed
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
18 Years to 100 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Sep 17, 2018 · Synced Oct 17, 2026, 6:04 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 17, 2026, 6:04 PM 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 17, 2026, 6:04 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Effect of a Fermented Dairy Protein With Prebiotic Fiber on GI Complaints

NCT06946017
View directory record Official record
Conditions
Digestive Health, Quality of Life
Interventions
Fermented dairy protein with prebiotic fiber supplement, Control placebo
Dietary Supplement
Lead sponsor
Arizona State University
Other
Eligibility
18 Years to 50 Years
Enrollment
114 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated May 8, 2026 · Synced Oct 17, 2026, 6:04 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ellagic Acid, Urolithin and Colonic Microbial Communities Affected by Walnut Consumption

NCT04066816
View directory record Official record
Conditions
Colo-rectal Cancer, Colon Cancer, Diet Habit
Interventions
Walnuts
Other
Lead sponsor
UConn Health
Other
Eligibility
50 Years to 65 Years
Enrollment
47 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 26, 2021 · Synced Oct 17, 2026, 6:04 PM EDT
Completed No phase listed Observational

Microbes and Bariatric Surgery

NCT01130207
View directory record Official record
Conditions
Obesity, Diabetes, Periodontal Disease
Interventions
Not listed
Lead sponsor
State University of New York - Upstate Medical University
Other
Eligibility
18 Years to 65 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Syracuse, New York
Source: ClinicalTrials.gov public record
Updated Nov 19, 2014 · Synced Oct 17, 2026, 6:04 PM EDT
Suspended No phase listed Observational Accepts healthy volunteers

A Study to Explore the Role of Gut Flora in COVID-19 Infection

NCT04359836
View directory record Official record
Conditions
Gut Microbiome, Gastrointestinal Microbiome, COVID, COVID-19, Corona Virus Infection, Coronavirus, Coronaviridae Infections, Coronavirus 19, Coronavirus-19, COVID 19
Interventions
There is no intervention in this study
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2027
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Sep 21, 2026 · Synced Oct 17, 2026, 6:04 PM 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 17, 2026, 6:04 PM EDT
Recruiting No phase listed Observational

Correlates of CRCI and Gut Microbiome Dysbiosis; a Pilot Study

NCT06098404
View directory record Official record
Conditions
Cancer
Interventions
Not listed
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 16, 2025 · Synced Oct 17, 2026, 6:04 PM EDT
Recruiting Not applicable Interventional

A Study of Herbal Supplements in Cancer Survivors With Constipation

NCT07091084
View directory record Official record
Conditions
Constipation, Cancer, Functional Constipation
Interventions
MZRW
Dietary Supplement
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
7
States / cities
Basking Ridge, New Jersey • Middletown, New Jersey • Montvale, New Jersey + 4 more
Source: ClinicalTrials.gov public record
Updated May 22, 2026 · Synced Oct 17, 2026, 6:04 PM EDT