Independent directory Public ClinicalTrials.gov records United States
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ClinicalTrials.gov public records Last synced Oct 24, 2026, 9:00 PM EDT

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Showing 265–288 of 680 matching trials from the live ClinicalTrials.gov search.
Conditions
Cancer Colon, Gastrointestinal Disease
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Rochester, Minnesota
Conditions
Irritable Bowel Syndrome (IBS), Small Intestinal Bacterial Overgrowth Syndrome (SIBO)
Interventions
Biocidin REMOVE, Placebo
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Conditions
Colorectal Cancer, Diet Habit
Interventions
Med, WL
Other
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
45 Years to 75 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Completed Phase 1 Interventional Accepts healthy volunteers

Longitudinal Study of the Human Intestinal Microbiome

NCT00832286
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
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Grape Impact on Human Gut Microbiome

NCT07797803
Conditions
Gut Microbiomes
Interventions
Grape Powder, Placebo Powder
Dietary Supplement · Other
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
45 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
New York, New York
Conditions
Non-GI Cancers, Cancer of Gastrointestinal Tract, Gastrointestinal Cancer
Interventions
Not listed
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
550 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2011
U.S. locations
1
States / cities
Bethesda, Maryland
Recruiting Phase 1Phase 2 Interventional

Intestinal Microbiome Transplant in ALS

NCT07017946
Conditions
Amyotrophic Lateral Sclerosis ALS
Interventions
MTP-101C
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Durham, North Carolina
Conditions
Polycystic Kidney Disease
Interventions
Not listed
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
New York, New York
Conditions
Weight Management, Obesity, Exercise, Women, Gut Microbiome, Metabolome, Health, Gut Microbiota
Interventions
Aerobic Exercise
Behavioral
Lead sponsor
George Washington University
Other
Eligibility
21 Years to 40 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Washington D.C., District of Columbia
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
Conditions
Breast Cancer
Interventions
Blood & Fecal Collection
Other
Lead sponsor
University of Arkansas
Other
Eligibility
18 Years and older · Female only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Little Rock, Arkansas
Withdrawn No phase listed Observational Accepts healthy volunteers

Intestinal Microbiome Composition in Infants With Biliary Atresia (BA)

NCT03890536
Conditions
Biliary Atresia, Intrahepatic Cholestases, Normal Controls
Interventions
Not listed
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
1 Day to 2 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2032
U.S. locations
1
States / cities
Cincinnati, Ohio
Conditions
Solid Tumor
Interventions
Potato starch
Drug
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
18 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Ann Arbor, Michigan
Completed Not applicable Interventional Accepts healthy volunteers

Traumatic Brain Injury and the Gut Microbiome

NCT04949607
Conditions
Brain Injury, Chronic, Brain Injuries, Traumatic
Interventions
Inulin fructooligosaccharide
Dietary Supplement
Lead sponsor
Centre for Neuro Skills
Industry
Eligibility
18 Years to 70 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Bakersfield, California
Conditions
Obesity, Overweight, Overweight and Obesity, PreDiabetes, Type 2 Diabetes, Type 2 Diabetes Mellitus, Type 2 Diabetes Mellitus in Obese
Interventions
Physical Activity Intervention
Behavioral
Lead sponsor
University of Minnesota
Other
Eligibility
30 Years to 64 Years
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Minneapolis, Minnesota
Completed Not applicable Interventional Accepts healthy volunteers

Adult HMO Supplementation and the Gut Microbiome

NCT06570330
Conditions
Healthy Adults
Interventions
SuperHMO, Non-GMO corn Maltodextrin, Rapid Absorption
Dietary Supplement
Lead sponsor
Seeding Inc
Industry
Eligibility
18 Years to 40 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Rockville, Maryland
Conditions
Bariatric Surgery Candidate
Interventions
Bariatric Surgery
Procedure
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
21 Years to 70 Years
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Completed Not applicable Interventional Accepts healthy volunteers Results available

Dietary Impact on Intestinal Sulfate Metabolism

NCT05333900
Conditions
Healthy Nutrition
Interventions
Plant-Based Diet then animal-based diet, Animal-based diet then plant-based diet
Behavioral
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 80 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Minneapolis, Minnesota
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Dietary Sodium Supplementation on Growth & Intestinal Microbiome

NCT05546814
Conditions
Preterm Birth
Interventions
Sodium algorithm
Procedure
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
25 Weeks to 30 Weeks
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Understanding the Role of Gut Microbiota in Hyperphagia in Prader-Willi Syndrome

NCT05541003
Conditions
Prader-Willi Syndrome, Obesity
Interventions
NBT-NM108
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 35 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
New Brunswick, New Jersey
Conditions
Healthy Volunteers
Interventions
Cardiosyn
Dietary Supplement
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
18 Years to 99 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Bethesda, Maryland
Conditions
Poor Sleep Quality, Gut Microbiome, Gut Health, Inflammation, Circadian Rhythm, Circadian Clocks, Gut Microbiota, Women's Health, Gut-Brain Axis, Blood Pressure, Systemic Inflammatory Response
Interventions
Overnight Active Temperature Regulation: Eight Sleep Pod System
Device
Lead sponsor
Eight Sleep Inc.
Industry
Eligibility
45 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Newton Center, Massachusetts
Conditions
Chronic Granulomatous Disease, Inflammatory Bowel Disease
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
3 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Bethesda, Maryland
Conditions
Microbial Colonization
Interventions
Prebiotics, Placebos
Dietary Supplement
Lead sponsor
Ann & Robert H Lurie Children's Hospital of Chicago
Other
Eligibility
2 Years to 18 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Chicago, Illinois