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ClinicalTrials.gov public records Last synced Oct 23, 2026, 1:31 PM EDT

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Showing 1–24 of 680 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Intestinal Microbiome Clear all
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 23, 2026, 1:31 PM EDT
Withdrawn Early Phase 1 Interventional

Terbinafine Treatment of Axial Spondyloarthropathy

NCT05119712
View directory record Official record
Conditions
Ankylosing Spondylitis, Axial Spondyloarthritis, Psoriatic Spondylitis, Spondylitis Secondary to Inflammatory Bowel Disease, Axial Spondyloarthopathy
Interventions
Terbinafine Tablets, Laboratory Testing
Drug · Diagnostic Test
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Aug 28, 2023 · Synced Oct 23, 2026, 1:31 PM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

The Healthy Diet and Lifestyle Study II

NCT05132686
View directory record Official record
Conditions
Intra-Abdominal Fat
Interventions
IER+MED, MED/DER
Behavioral
Lead sponsor
University of Hawaii
Other
Eligibility
35 Years to 69 Years
Enrollment
260 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Honolulu, Hawaii
Source: ClinicalTrials.gov public record
Updated Apr 3, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Microbiome Derived Metabolism and Pharmacokinetics

NCT05065671
View directory record Official record
Conditions
Microbial Colonization
Interventions
Tolcapone 100 MG, Duloxetine 20 MG
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 65 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Somerville, New Jersey
Source: ClinicalTrials.gov public record
Updated Apr 29, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Active, not recruiting Phase 2 Interventional

MTT for Children With ASD Who Have Gastrointestinal Disorders

NCT04182633
View directory record Official record
Conditions
Autism Spectrum Disorder, Gastro-Intestinal Disorder, Constipation, Diarrhea
Interventions
vancomycin, Miralax, intestinal microbiota, placebo vancomycin, Miralax, placebo intestinal microbiota
Combination Product
Lead sponsor
Arizona State University
Other
Eligibility
5 Years to 17 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Apr 25, 2025 · Synced Oct 23, 2026, 1:31 PM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

High-Resolution Measurements of Diet-Microbiome Interactions

NCT07856823
View directory record Official record
Conditions
IBS (Irritable Bowel Syndrome)
Interventions
Inulin, Low-fiber control breakfast shake, Atmo Gas-Sensing Capsule, CapScan Regional Fluid-Sampling Capsule
Dietary Supplement · Other · Device
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 23, 2026, 1:31 PM 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 15, 2016 · Synced Oct 23, 2026, 1:31 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Supplementation of Cholecalciferol and Related Active Metabolites Through Bioenhancing Layer's Eggs

NCT07859280
View directory record Official record
Conditions
Healthy Adult Participants, Vitamin D Insufficiency
Interventions
Vitamin D3 bioenhanced eggs, 25(OH)D3 bioenhanced eggs
Dietary Supplement
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 40 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2027 – 2029
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Bifido Bacteria to Improve Lactose Digestion and Tolerance

NCT05668468
View directory record Official record
Conditions
Lactose Intolerance
Interventions
Bifidobacterium adolescentis IVS-1 capsule, Placebo cellulose capsule
Dietary Supplement · Other
Lead sponsor
Purdue University
Other
Eligibility
18 Years to 65 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Oct 20, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Recruiting No phase listed Observational

Study to Detect Changes in Urinary and Gut Microbiome During Androgen Deprivation Therapy and Radiation Therapy in Patients With Prostate Cancer

NCT04775355
View directory record Official record
Conditions
Stage I Prostate Cancer AJCC v7, Stage II Prostate Cancer AJCC v7, Stage IIA Prostate Cancer AJCC v7, Stage IIB Prostate Cancer AJCC v7, Stage III Prostate Cancer AJCC v7, Stage IV Prostate Cancer AJCC v7
Interventions
Biospecimen Collection, Electronic Health Record Review, Quality-of-Life Assessment, Questionnaire Administration
Procedure · Other
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years and older · Male only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Interactions of Human Gut Microbiota With Intestinal Sweet Taste Receptors

NCT03032640
View directory record Official record
Conditions
Obesity
Interventions
Oral Glucose Tolerance Test (OGTT), Assessment of dietary compliance, Stool sampling, Sodium Saccharin, Placebo, Lactisole
Other
Lead sponsor
AdventHealth Translational Research Institute
Other
Eligibility
18 Years to 45 Years
Enrollment
102 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Feb 2, 2023 · Synced Oct 23, 2026, 1:31 PM EDT
Completed No phase listed Observational

Schizophrenia and the Gut Microbiome

NCT02921243
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder
Interventions
Not listed
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years to 64 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Catonsville, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 19, 2019 · Synced Oct 23, 2026, 1:31 PM 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 27, 2025 · Synced Oct 23, 2026, 1:31 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Pulse Consumption, Gut Microbiome, and Appetite in Healthy Participants

NCT07043712
View directory record Official record
Conditions
Microbial Colonization, Metabolic Syndrome
Interventions
High pulse consumption
Dietary Supplement
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
20 Years to 55 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Withdrawn No phase listed Observational

A Pilot Study to Explore the Role of Gut Flora in Acne

NCT04214483
View directory record Official record
Conditions
Acne, Acne Vulgaris, Acne Keloidalis, Acne Keloid, Acne Conglobata, Acne Rosacea, Acne Inversa, Acne Cystic, Acne Pomade, Acne Indurata, Acne Papular, Acne Tropica, Acne Urticata, Acne Fulminans, Acne Follicular, Acne Tropicalis, Acne Detergicans, Acne Iodide, Acne Varioliformis
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 23, 2026, 1:31 PM 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 15, 2025 · Synced Oct 23, 2026, 1:31 PM EDT
Active, not recruiting Not applicable Interventional Results available

Early Protein Supplementation in Extremely Preterm Infants Fed Human Milk

NCT04325308
View directory record Official record
Conditions
Prematurity; Extreme, Feeding Disorder Neonatal, Breast Milk Expression, Growth Failure, Microbial Colonization
Interventions
Protein-enriched human milk diet, Usual human milk diet
Procedure
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
1 Day to 4 Days
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 21, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Distinct Nebraska-Dry Bean Market Classes on Gut Microbiota

NCT06935435
View directory record Official record
Conditions
Dietary Intervention, Gut Microbiota
Interventions
Pink Beans, Great Northern Beans, Five-Bean Mixture
Other
Lead sponsor
University of Nebraska Lincoln
Other
Eligibility
19 Years to 50 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Feb 4, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Completed Phase 1 Interventional Results available

Melanoma Checkpoint and Gut Microbiome Alteration With Microbiome Intervention

NCT03817125
View directory record Official record
Conditions
Metastatic Melanoma
Interventions
Placebo for antibiotic, Vancomycin pretreatment, Nivolumab, Matching Placebo for SER-401, SER-401
Drug
Lead sponsor
Parker Institute for Cancer Immunotherapy
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
7
States / cities
Los Angeles, California • Boston, Massachusetts • New Brunswick, New Jersey + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 6, 2024 · Synced Oct 23, 2026, 1:31 PM EDT
Completed Phase 1 Interventional

Fecal Microbiota Transplantation in HIV

NCT02256592
View directory record Official record
Conditions
HIV
Interventions
Fecal Microbiota
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 75 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated May 4, 2017 · Synced Oct 23, 2026, 1:31 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Low Sugar Protein Pacing, Intermittent Fasting Diet in Men and Women

NCT04327141
View directory record Official record
Conditions
Weight Loss, Gut Microbiome, Anti-Aging
Interventions
P-IF, HH
Behavioral
Lead sponsor
Skidmore College
Other
Eligibility
25 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Saratoga Springs, New York
Source: ClinicalTrials.gov public record
Updated Apr 8, 2024 · Synced Oct 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Resistant Starch Wheat for Improved Metabolic Health

NCT03082131
View directory record Official record
Conditions
Gut Microbiota, Metabolism, Metabolic Health
Interventions
Resistant Starch Wheat
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
40 Years to 65 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated May 7, 2019 · Synced Oct 23, 2026, 1:31 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Pulses Consumption and Its Role in Managing Systemic Inflammation, Insulin Sensitivity and Gut Microbiome in Human

NCT04267705
View directory record Official record
Conditions
Insulin Sensitivity, Overweight or Obesity, Inflammatory Response
Interventions
Control, Black bean, Chickpea
Other
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
18 Years and older
Enrollment
103 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 23, 2026, 1:31 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Gallotannins on the Gut Microbiome and How it Affects Inflammatory Markers Among Obese Individuals.

NCT07505212
View directory record Official record
Conditions
Obesity (Disorder)
Interventions
Gallotannin-rich mango, Lactiplantibacillus pentosus (probiotic), No Treatment Added
Dietary Supplement · Other
Lead sponsor
Prairie View A&M University
Other
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Prairie View, Texas
Source: ClinicalTrials.gov public record
Updated Sep 16, 2026 · Synced Oct 23, 2026, 1:31 PM EDT