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Showing 1–24 of 670 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Gut Microbiome Clear all
Withdrawn No phase listed Observational

A Non-Interventional Pilot Study to Explore the Role of Gut Flora in Bipolar Disorder

NCT04211428
View directory record Official record
Conditions
Bipolar Disorder, Bipolar I Disorder, Bipolar II Disorder, Bipolar Type I Disorder, Bipolar Disorder Mild, Bipolar Disorder Moderate, Bipolar Disorder Severe
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 Jul 21, 2026, 11:17 AM EDT
Not listed Phase 2 Interventional

Gut Microbiota Changes After Fecal Microbiota Transplantation

NCT02557685
View directory record Official record
Conditions
Clostridium Difficile Infection
Interventions
Fecal Microbiota Transplantation
Biological
Lead sponsor
The Miriam Hospital
Other
Eligibility
18 Years to 90 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Sep 22, 2015 · Synced Jul 21, 2026, 11:17 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Enfamil NeuroPro Study

NCT06059209
View directory record Official record
Conditions
Infant Development, Infant ALL
Interventions
Enfamil NeuroPro, Enfamil Infant
Dietary Supplement
Lead sponsor
University of Arizona
Other
Eligibility
0 Months to 4 Months
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Dec 10, 2025 · Synced Jul 21, 2026, 11:17 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 Jul 21, 2026, 11:17 AM EDT
Withdrawn No phase listed Observational

Diet, Physical Activity and Body Composition Changes During R-CHOP

NCT04293900
View directory record Official record
Conditions
Non-Hodgkin Lymphoma, DLBCL, Diffuse Large B Cell Lymphoma
Interventions
24-hour dietary recall, Hand grip strength, International Physical Activity Questionnaire, Patient-reported outcomes survey, Pittsburgh Sleep Quality Index, Functional Assessment of Cancer Treatment - Lymphoma, urine sample (optional), fecal sample (optional)
Other
Lead sponsor
George Washington University
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Oct 5, 2020 · Synced Jul 21, 2026, 11:17 AM EDT
Completed No phase listed Observational

Gastrointestinal Microbiome Influence on the Development of Bronchopulmonary Dysplasia

NCT03229967
View directory record Official record
Conditions
Bronchopulmonary Dysplasia
Interventions
16S rRNA stool microbiome sequencing.
Diagnostic Test
Lead sponsor
University of Tennessee
Other
Eligibility
0 Days to 7 Days
Enrollment
197 participants
Timeline
2017 – 2020
U.S. locations
2
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated May 9, 2023 · Synced Jul 21, 2026, 11:17 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Discrimination and the Brain-Gut-Microbiome (BGM) Axis

NCT05120908
View directory record Official record
Conditions
Discrimination, Racial, Social Isolation, Stress
Interventions
Not listed
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
266 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 9, 2025 · Synced Jul 21, 2026, 11:17 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Anti-inflammatory Effect and Associated Mechanisms of Mango Consumption

NCT04726293
View directory record Official record
Conditions
Overweight or Obesity, Healthy
Interventions
Mango, Control
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
20 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 10, 2025 · Synced Jul 21, 2026, 11:17 AM EDT
Recruiting Not applicable Interventional

Maternal Probiotic Supplementation for Improved Outcomes in Infants of Diabetic Mothers

NCT05467150
View directory record Official record
Conditions
Infant of Diabetic Mother
Interventions
Probiotic Supplement
Dietary Supplement
Lead sponsor
University of Minnesota
Other
Eligibility
21 Years to 45 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 11, 2025 · Synced Jul 21, 2026, 11:17 AM EDT
Not listed Not applicable Interventional

Gastrointestinal Microbiome Study of Appendiceal Cancer

NCT02599116
View directory record Official record
Conditions
Pseudomyxoma Peritonei, Appendiceal Neoplasm, Cancer, Appendiceal
Interventions
Bio-specimen collection, Questionnaire
Other
Lead sponsor
Mercy Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 26, 2023 · Synced Jul 21, 2026, 11:17 AM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Vaginal Microbiome Seeding and Health Outcomes in Cesarean-delivered Neonates.

NCT03298334
View directory record Official record
Conditions
Cesarean Delivery Affecting Newborn, Obesity, Childhood, Intestinal Microbiome, Microbiota, Host Microbial Interactions, Gastrointestinal Microbiome
Interventions
Vaginal Seeding, No Vaginal Seeding
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
0 Days to 50 Years
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2029
U.S. locations
1
States / cities
Falls Church, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 7, 2025 · Synced Jul 21, 2026, 11:17 AM EDT
Active, not recruiting No phase listed Observational

REMBRANDT: REcovery of the MicroBiome fRom Antibiotics for Dental implanTs

NCT05622721
View directory record Official record
Conditions
Dysbiosis, Clostridium Difficile, Pet-Human Bonding, Antibiotic-Associated Colitis
Interventions
Not listed
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 7, 2026 · Synced Jul 21, 2026, 11:17 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Influence of Honey-flavored Yogurt on Low-grade Inflammation and Gut Health in Middle to Older Aged Women.

NCT04248127
View directory record Official record
Conditions
Overweight
Interventions
Honey sweetened yogurt, Sugar sweetened yogurt
Other
Lead sponsor
University of California, Davis
Other
Eligibility
45 Years to 65 Years · Female only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Feb 9, 2026 · Synced Jul 21, 2026, 11:17 AM EDT
Completed Phase 2 Interventional Results available

The Effects of Patiromer on Serum Potassium Level and Gut Microbiome of ESRD Patients With Hyperkalemia

NCT03326583
View directory record Official record
Conditions
ESRD, Hyperkalemia, End Stage Renal Disease
Interventions
Patiromer
Drug
Lead sponsor
Dominic Raj
Other
Eligibility
18 Years to 85 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated May 8, 2023 · Synced Jul 21, 2026, 11:17 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Gut Microbiota Post Roux-en-Y Gastric Bypass Surgery

NCT02654496
View directory record Official record
Conditions
Obesity
Interventions
Meal challenge
Other
Lead sponsor
North Dakota State University
Other
Eligibility
18 Years to 65 Years · Female only
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Fargo, North Dakota
Source: ClinicalTrials.gov public record
Updated Aug 22, 2018 · Synced Jul 21, 2026, 11:17 AM EDT
Recruiting Phase 2 Interventional

Modulation of the Gut Microbiome With Pembrolizumab Following Chemotherapy in Resectable Pancreatic Cancer

NCT05462496
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
Biopsy, FOLFIRINOX, Ciprofloxacin, Metronidazole, Pembrolizumab, Surgical Resection
Procedure · Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
19 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 14, 2024 · Synced Jul 21, 2026, 11:17 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Dietary Flavonoids on Intestinal Microbiota, Intestinal Inflammation and Metabolic Syndrome

NCT02728570
View directory record Official record
Conditions
Metabolic Syndrome X, Inflammation
Interventions
High Dietary Flavonoids, Low Dietary Flavonoids
Other
Lead sponsor
Utah State University
Other
Eligibility
18 Years to 70 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Logan, Utah
Source: ClinicalTrials.gov public record
Updated Apr 14, 2016 · Synced Jul 21, 2026, 11:17 AM EDT
Recruiting Phase 2 Interventional

Addition of Antibiotics to Upfront Treatment Regimen for Colorectal Cancer

NCT06728072
View directory record Official record
Conditions
Colorectal Cancer, CRC
Interventions
Standard of Care Chemotherapy + Metronidazole, ciprofloxacin, aspirin
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
97 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2035
U.S. locations
2
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated May 5, 2026 · Synced Jul 21, 2026, 11:17 AM EDT
Completed No phase listed Observational

Effects of Chemotherapy on Intestinal Bacteria in Patients With Newly Diagnosed Breast Cancer

NCT02370277
View directory record Official record
Conditions
Ductal Breast Carcinoma In Situ, Invasive Breast Carcinoma, Stage I Breast Cancer, Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer
Interventions
Cytology Specimen Collection Procedure, Laboratory Biomarker Analysis, Questionnaire Administration
Other
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older · Female only
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 17, 2019 · Synced Jul 21, 2026, 11:17 AM EDT
Enrolling by invitation No phase listed Observational

Enabling Microbiomics- Driven Personalized Nutrition

NCT06657001
View directory record Official record
Conditions
Inflammatory Bowel Disease (IBD), Irritable Bowel Syndrome (IBS), Celiac Disease, Diarrhea, Constipation, Microbiome, Crohn's Disease, UC - Ulcerative Colitis, Microscopic Colitis, Functional Dyspepsia
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
4,001 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Jul 21, 2026, 11:17 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Dietary Milk Polar Lipids on Serum Cholesterol and Gut Microbiota in Healthy Adults

NCT04208815
View directory record Official record
Conditions
Serum Cholesterol, Gut Microbiome
Interventions
Milk Polar Lipids, Milk Fat
Other
Lead sponsor
University of Connecticut
Other
Eligibility
18 Years to 50 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 12, 2022 · Synced Jul 21, 2026, 11:17 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Salty Gut: Effects of High Dietary Salt Intake on the Gut Microbiota

NCT04229680
View directory record Official record
Conditions
Cardiovascular Risk Factor
Interventions
High Salt, Recommended Salt
Other
Lead sponsor
University of Delaware
Other
Eligibility
18 Years to 45 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated Oct 1, 2023 · Synced Jul 21, 2026, 11:17 AM EDT
Terminated Phase 2 Interventional Results available

Personalized AZithromycin/metronidAZole Therapy in Pediatric Crohn's Disease (CD)

NCT04186247
View directory record Official record
Conditions
Crohn Disease, Pediatric Crohns Disease
Interventions
Azithromycin, Metronidazole, Standard of Care
Drug · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
3 Years to 17 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
2
States / cities
San Francisco, California • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 28, 2025 · Synced Jul 21, 2026, 11:17 AM EDT