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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Gut Microbiomes Clear all
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Smoothie Program for Achieving and Resilient Kids

NCT07195474
View directory record Official record
Conditions
Executive Functions (EF), Microbiome, Dietary Quality
Interventions
Yogurt Smoothie (1 per day), Yogurt Smoothie (2 per day), Fruit Juice Control
Dietary Supplement
Lead sponsor
Penn State University
Other
Eligibility
7 Years to 9 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
State College, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 19, 2026 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Pilot Study to Determine the Effect of a Cobiotic Formulation on the Gastrointestinal Microbiome

NCT01724736
View directory record Official record
Conditions
Pre Diabetic
Interventions
Placebo, NM504:
Drug
Lead sponsor
NuMe Health
Industry
Eligibility
18 Years to 70 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Jul 23, 2014 · Synced Sep 26, 2026, 10:42 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Microbiome Sampling During Endurance Exercise

NCT06903806
View directory record Official record
Conditions
Healthy, Exercise-Induced Lactic Acidemia
Interventions
Treadmill Exercise, Cooling Gloves, Microbiome Capsule
Other · Device
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 80 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Mar 31, 2025 · Synced Sep 26, 2026, 10:42 AM EDT
Not listed No phase listed Observational

Predicting Chronic Opioid Use Following Lower Extremity Joint Arthroplasty

NCT04974463
View directory record Official record
Conditions
Joint Pain, Chronic Pain, Opioid Use
Interventions
Not listed
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
1,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jul 26, 2023 · Synced Sep 26, 2026, 10:42 AM EDT
Completed No phase listed Observational

The Effect of Transjugular Intraheptic Portosystemic Shunt (TIPS) on Gastrointestinal Motility and the Gut Microbiota

NCT03599492
View directory record Official record
Conditions
Cirrhosis
Interventions
SMART Pill Pre-TIPS, SMART Pill Post TIPS
Diagnostic Test
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 99 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 8, 2022 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Effect of Estrogen Treatment on Drug Metabolism and Transport

NCT05469204
View directory record Official record
Conditions
Transgender Persons
Interventions
Midazolam oral solution, Digoxin Oral Tablet, Acetaminophen Oral Tablet, Midazolam Injectable Solution
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 55 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jan 8, 2026 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Phase 4 Interventional Results available

A Longitudinal Study to Identify IBS Phenotypes Using Fecal Microbiota and Hydrogen Breath Testing

NCT03219528
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Rifaximin 550 MG, Low FODMAP Diet
Drug · Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 26, 2025 · Synced Sep 26, 2026, 10:42 AM EDT
Withdrawn No phase listed Observational

A Non-Interventional Pilot Study to Explore the Role of Gut Flora in Migraine Headaches

NCT04211454
View directory record Official record
Conditions
Migraine
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 4, 2025 · Synced Sep 26, 2026, 10:42 AM EDT
Terminated Phase 2 Interventional Results available

A Study to Assess Efficacy and Safety of SER-287 in Adults With Active Mild-to-Moderate Ulcerative Colitis

NCT03759041
View directory record Official record
Conditions
Ulcerative Colitis
Interventions
Vancomycin Pre-Treatment, Placebo for Vancomycin Pre-Treatment, SER-287, Placebo for SER-287
Drug
Lead sponsor
Seres Therapeutics, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
203 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
81
States / cities
Phoenix, Arizona • North Little Rock, Arkansas • La Jolla, California + 70 more
Source: ClinicalTrials.gov public record
Updated Aug 11, 2022 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional

Exercise, Gut Microbiome, and Breast Cancer: Increasing Reach to Underserved Populations

NCT05000502
View directory record Official record
Conditions
Female Breast Cancer
Interventions
Home-based exercise intervention
Behavioral
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 70 Years · Female only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Mar 21, 2024 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Early Phase 1 Interventional Results available

Probiotics for Quality of Life in Autism Spectrum Disorders

NCT02903030
View directory record Official record
Conditions
Autism Spectrum Disorders, Anxiety
Interventions
Maltose (placebo), Visbiome Extra Strength
Drug
Lead sponsor
Ohio State University
Other
Eligibility
3 Years to 12 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional

Edible Insects: Good for the Gut and the Globe

NCT06397924
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
Chitin Fiber, Placebo
Dietary Supplement
Lead sponsor
Colorado State University
Other
Eligibility
18 Years and older
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 23, 2025 · Synced Sep 26, 2026, 10:42 AM EDT
Withdrawn No phase listed Observational

A Pilot Study to Explore the Role of Gut Flora in Myasthenia Gravis

NCT04224506
View directory record Official record
Conditions
Myasthenia Gravis, Myasthenia Gravis, Generalized
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 4, 2025 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Rescuing the Microbiome Effectively With Different Doses of B. Infantis in Infants

NCT03476447
View directory record Official record
Conditions
Gut Microbiome
Interventions
B. infantis EVC001, Lactose
Other
Lead sponsor
Evolve BioSystems, Inc.
Industry
Eligibility
2 Months to 4 Months
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 18, 2019 · Synced Sep 26, 2026, 10:42 AM EDT
Recruiting Phase 2 Interventional

Fecal Microbiome Transplant to Remodel Intestinal Microbiota for Patients With Relapsed or Refractory Lymphoma With Exposure to High-Risk Antibiotics Who Are Receiving Chimeric Antigen Receptor T Cells

NCT07042438
View directory record Official record
Conditions
Recurrent Diffuse Large B-Cell Lymphoma, Recurrent High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements, Recurrent Transformed Follicular Lymphoma to Diffuse Large B-Cell Lymphoma, Refractory Diffuse Large B-Cell Lymphoma, Refractory High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements, Refractory Transformed Follicular Lymphoma to Diffuse Large B-Cell Lymphoma
Interventions
Axicabtagene Ciloleucel, Biospecimen Collection, Chemotherapy, Fecal Microbiota Transplantation, Leukapheresis, Placebo Administration
Biological · Procedure · Drug
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years and older
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Mar 4, 2026 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ergogenic Properties of Magnesium Supplementation

NCT05282693
View directory record Official record
Conditions
Exercise Performance, Gut -Microbiota, Mitochondrial Function
Interventions
ReMag, Placebo
Dietary Supplement
Lead sponsor
Christopher Bell
Other
Eligibility
18 Years to 40 Years
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated May 15, 2024 · Synced Sep 26, 2026, 10:42 AM EDT
Active, not recruiting Not applicable Interventional

A Culturally Tailored Dietary Intervention to Treat Crohn's Disease

NCT05627128
View directory record Official record
Conditions
Crohn Disease
Interventions
DAIN
Other
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
21 Years to 65 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

To Investigate the Effect of Arabinogalactan on the Gut Microbiome in Adults

NCT04351841
View directory record Official record
Conditions
Gut Microbiota
Interventions
arabinogalactan, maltodextrin
Other
Lead sponsor
Biofortis, Merieux NutriSciences
Industry
Eligibility
18 Years to 60 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Addison, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 21, 2020 · Synced Sep 26, 2026, 10:42 AM EDT
Not listed No phase listed Observational

Composition and Collection Feasibility of Gut Microbiota in Children With and Without Obesity

NCT03149601
View directory record Official record
Conditions
Childhood Obesity
Interventions
Not listed
Lead sponsor
University of Illinois College of Medicine at Peoria
Other
Eligibility
5 Years to 12 Years
Enrollment
150 participants
Timeline
2017 – 2019
U.S. locations
1
States / cities
Peoria, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 31, 2019 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Walnuts and Colon Health

NCT05195970
View directory record Official record
Conditions
Colorectal Cancer, Diet Habit
Interventions
Walnuts
Other
Lead sponsor
UConn Health
Other
Eligibility
39 Years to 75 Years
Enrollment
140 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
2
States / cities
Farmington, Connecticut • New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Fermented Vegetables and Gut Microbiome Pilot Study

NCT06883994
View directory record Official record
Conditions
Fermented Vegetable Intake, Fermented Vegetable Acceptability, Gut Health, Gut Microbiome, Gastrointestinal Immune Function, Microbiome
Interventions
Fermented vegetable intervention
Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 65 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Dec 14, 2025 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional

Engineering Gut Microbiome to Target Breast Cancer

NCT03358511
View directory record Official record
Conditions
Breast Cancer
Interventions
Probiotic
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older · Female only
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated May 20, 2020 · Synced Sep 26, 2026, 10:42 AM EDT
Completed Not applicable Interventional

Probiotic Supplementation on Weight Loss

NCT03832439
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Probiotic, microcrystalline cellulose
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 20, 2022 · Synced Sep 26, 2026, 10:42 AM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Intestinal Microbiome Composition in Infants With Biliary Atresia (BA)

NCT03890536
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Jul 8, 2025 · Synced Sep 26, 2026, 10:42 AM EDT