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ClinicalTrials.gov public records Last synced Oct 21, 2026, 10:12 AM EDT

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Showing 49–72 of 483 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Microbiota Clear all
Completed Phase 1 Interventional

Safety of FMT Using Oral Encapsulated PRIM-DJ2727 in HIV

NCT03329560
View directory record Official record
Conditions
HIV-1-infection
Interventions
Oral fecal microbiota transplantation
Biological
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years and older · Male only
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 27, 2020 · Synced Oct 21, 2026, 10:12 AM EDT
Not yet recruiting Phase 4 Interventional

Impact of Probiotics on Gut Microbiome During Antibiotic Prophylaxis in Elective Orthopedic Surgery

NCT06791993
View directory record Official record
Conditions
Dysbiosis, Gut -microbiota, Microbiome Analysis, Probiotic, Antibiotic Prophylaxis
Interventions
Placebo Capsule, Probiotic with Human Milk Oligosaccharides (HMO)
Drug · Dietary Supplement
Lead sponsor
Acibadem Maslak Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 24, 2025 · Synced Oct 21, 2026, 10:12 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Precision Nutrition New York Study

NCT06777498
View directory record Official record
Conditions
Body Composition Changes, Body Weight Changes
Interventions
Whole Grain Intervention then fruits and vegetables, Fruit and Vegetable Intervention and then whole grains
Other
Lead sponsor
Cornell University
Other
Eligibility
21 Years to 50 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Jul 11, 2025 · Synced Oct 21, 2026, 10:12 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Serine Proteases in Gastrointestinal Function and Irritable Bowel Syndrome (IBS)

NCT01072916
View directory record Official record
Conditions
Colon, Irritable
Interventions
Not listed
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2015
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 11, 2016 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Dairy Fat and Fermentation Study

NCT05840081
View directory record Official record
Conditions
Heart Diseases, Microbial Colonization, Inflammation
Interventions
Milk or yogurt beverage
Other
Lead sponsor
Tufts University
Other
Eligibility
50 Years and older
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 12, 2025 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of a Novel Food Product Containing Microbiota Accessible Carbohydrates on the Human Microbiome

NCT03058575
View directory record Official record
Conditions
Gut Microbiome
Interventions
Dietary MACs, Control
Dietary Supplement · Other
Lead sponsor
Access Business Group
Industry
Eligibility
40 Years to 60 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Addison, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 23, 2018 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Phase 4 Interventional

Fecal Microbiota Transplant

NCT04090346
View directory record Official record
Conditions
Clostridium Difficile Infection
Interventions
Fecal Microbiota Transplant
Drug
Lead sponsor
Methodist Health System
Other
Eligibility
Not listed
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Gut Microbiota Changes in Obese Individuals Undergoing Dedicated Lifestyle Modification Programs

NCT02855242
View directory record Official record
Conditions
Obesity
Interventions
Lifestyle Counseling, Controls Group
Behavioral · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 16, 2021 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional

A Controlled Study of Stem Cell Transplantation Medical Home Care Compared to Standard Hospital Care

NCT01725022
View directory record Official record
Conditions
Hematologic Malignancies
Interventions
Home Care
Other
Lead sponsor
Duke University
Other
Eligibility
18 Years to 80 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2017
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 16, 2019 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Galactooligosaccharides (GOS) on the Gut Microbiota of Lactose Intolerance Individuals

NCT06915129
View directory record Official record
Conditions
Modulation of the Human Gut Microbiota by Prebiotic Galactooligosaccharides (GOS)
Interventions
Prebiotic galactooligosaccharides (GOS)
Dietary Supplement
Lead sponsor
Oregon State University
Other
Eligibility
19 Years to 55 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Corvallis, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 8, 2025 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Fecal Microbiota Transplantation for the Treatment of Primary Sclerosing Cholangitis.

NCT02424175
View directory record Official record
Conditions
Sclerosing Cholangitis
Interventions
Fecal Microbiota Transplantation
Biological
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 28, 2019 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The RAMP Study - Rejuvenation of the Aging Microbiota With Prebiotics

NCT03690999
View directory record Official record
Conditions
Microbiome, Immune Function, Inflammation
Interventions
Placebo, Prebiotic supplement
Dietary Supplement
Lead sponsor
Stanford University
Other
Eligibility
60 Years and older
Enrollment
98 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Feb 17, 2023 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Phase 2 Interventional Results available

Fecal Microbiota Transplant (FMT) in Melanoma Patients

NCT03341143
View directory record Official record
Conditions
Melanoma
Interventions
Fecal Microbiota Transplant with Pembrolizumab
Drug
Lead sponsor
Zarour, Hassane, MD
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 30, 2024 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional

Efficacy of Evidence-Based PTSD Treatment Via Prebiotic Supplementation

NCT05424146
View directory record Official record
Conditions
Post Traumatic Stress Disorder
Interventions
Prebiotic Bar +CPT, Non-Prebiotic Bar +CPT
Dietary Supplement · Behavioral
Lead sponsor
Rush University Medical Center
Other
Eligibility
Not listed
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 16, 2024 · Synced Oct 21, 2026, 10:12 AM EDT
Terminated Phase 2 Interventional Results available

Pembrolizumab and EDP1503 in Advanced Melanoma

NCT03595683
View directory record Official record
Conditions
Melanoma (Skin), Melanoma
Interventions
Pembrolizumab, EDP1503
Drug · Biological
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 8, 2025 · Synced Oct 21, 2026, 10:12 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Evaluating the Effects of a Synbiotic Versus Probiotic or Placebo on Gut Microbiota and Cardiometabolic Health: A Randomized Double-Blind Placebo Controlled Trial

NCT06544915
View directory record Official record
Conditions
Blood Pressure, Body Composition, Immune Function
Interventions
Synbiotic, Probiotic, Placebo
Dietary Supplement
Lead sponsor
Skidmore College
Other
Eligibility
18 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Saratoga Springs, New York
Source: ClinicalTrials.gov public record
Updated Aug 9, 2024 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Probiotics (L. Helveticus, B. Longum, and B. Bifidum) on Immune Function and Digestive Health

NCT01709825
View directory record Official record
Conditions
Healthy
Interventions
Probiotic- Bifidobacterium Bifidum, Sugar Pill, Probiotic- Lactobacillus helveticus, Probiotic- Bifidobacterium longum ss. Infantis R0033
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
18 Years and older
Enrollment
583 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 29, 2015 · Synced Oct 21, 2026, 10:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Cranberry Juice Consumption on Gut and Vaginal Microbiota in Post-menopausal Women

NCT04680325
View directory record Official record
Conditions
Urinary Tract Infections
Interventions
Juice daily consumption
Dietary Supplement
Lead sponsor
University of Arkansas, Fayetteville
Other
Eligibility
Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Fayetteville, Arkansas
Source: ClinicalTrials.gov public record
Updated Dec 22, 2020 · Synced Oct 21, 2026, 10:12 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Effect of Testosterone Treatment on Drug Metabolism and Transport

NCT05116293
View directory record Official record
Conditions
Transgender Persons
Interventions
Midazolam oral solution, Digoxin Oral Tablet, Acetaminophen Oral Tablet
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 60 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated May 4, 2026 · Synced Oct 21, 2026, 10:12 AM EDT
Active, not recruiting Phase 2 Interventional

Fecal Microbiota Transplantation for the Prevention of Acute Graft Versus Host Disease in Adults Undergoing Allogeneic Hematopoietic Cell Transplantation

NCT06026371
View directory record Official record
Conditions
Acute Graft Versus Host Disease, Hematopoietic and Lymphatic System Neoplasm
Interventions
Fecal Microbiota Transplantation Capsule, Placebo
Drug
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
157 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Oct 20, 2026 · Synced Oct 21, 2026, 10:12 AM 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 21, 2026, 10:12 AM EDT
Not listed Phase 2 Interventional

Microbiota Transplant Therapy for Children With Both Autism Spectrum Disorder and Gastrointestinal Disorders

NCT06503978
View directory record Official record
Conditions
Autism Spectrum Disorder, Gastro-Intestinal Disorder, Constipation, Diarrhea
Interventions
MTP-101P, Vancomycin, Miralax, Antacid, Placebo MTP-101P, Placebo Vancomycin
Combination Product
Lead sponsor
Gut-Brain-Axis Therapeutics Inc.
Other
Eligibility
4 Years to 18 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 25, 2024 · Synced Oct 21, 2026, 10:12 AM EDT
Recruiting Phase 1 Interventional

Evaluating the Effect Of Rifaximin on the Gut Microbiota and Metabolome in SIBO Using CapScan®

NCT06298409
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth
Interventions
CapScan collection capsule
Device
Lead sponsor
Envivo Bio Inc
Industry
Eligibility
18 Years to 80 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Mountain View, California
Source: ClinicalTrials.gov public record
Updated Jun 11, 2025 · Synced Oct 21, 2026, 10:12 AM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Periodontal Inflammation and Epigenetics in Obese Individuals

NCT07610902
View directory record Official record
Conditions
Obesity, Periodontitis
Interventions
Non-surgical periodontal therapy will be administered
Procedure
Lead sponsor
Louisiana State University Health Sciences Center in New Orleans
Other
Eligibility
18 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated May 28, 2026 · Synced Oct 21, 2026, 10:12 AM EDT