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ClinicalTrials.gov public records Last synced Oct 24, 2026, 4:46 AM EDT

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Showing 169–192 of 680 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Intestinal Microbiome Clear all
Suspended No phase listed Observational Accepts healthy volunteers

A Study to Explore the Role of Gut Flora in COVID-19 Infection

NCT04359836
View directory record Official record
Conditions
Gut Microbiome, Gastrointestinal Microbiome, COVID, COVID-19, Corona Virus Infection, Coronavirus, Coronaviridae Infections, Coronavirus 19, Coronavirus-19, COVID 19
Interventions
There is no intervention in this study
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2027
U.S. locations
1
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Sep 21, 2026 · Synced Oct 24, 2026, 4:46 AM EDT
Recruiting Not applicable Interventional

Wild Blueberries for Gut, Brain, and Heart Health in Adults With High Blood Pressure

NCT06735599
View directory record Official record
Conditions
Hypertension (Without Type 2 Diabetes Mellitus), High Blood Pressure, Male, Female, Adult, Cognition, Endothelial Function (Reactive Hyperemia), Oxidative Stress, Diet, Overweight, Body Composition Measurement, Gut Microbiome, Arterial Stiffness, Caucasian Whites, Inflammation, Microvascular Function
Interventions
Wild Blueberry, Placebo
Dietary Supplement
Lead sponsor
Georgia State University
Other
Eligibility
45 Years to 65 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional

Effect of a Probiotic Mixture on the Gut Microbiome and Fatigue in Patients With Quiescent Inflammatory Bowel Disease

NCT03266484
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Crohn Disease, Ulcerative Colitis
Interventions
Probiotic Mixture, Placebo
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 75 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 9, 2025 · Synced Oct 24, 2026, 4:46 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Assessing the Short-Term Effects of Multi-Fiber Supplementation on Gut Health

NCT07787026
View directory record Official record
Conditions
Mixed Fiber Supplementation for Healthy Adults
Interventions
Prebiotic, Placebo
Dietary Supplement
Lead sponsor
Brown University
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2029
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional

The Effect of Increasing Dietary Protein on the Gut Microbiome and Its Metabolites

NCT06677333
View directory record Official record
Conditions
Health Adults
Interventions
Whey Protein, Pea protein
Other
Lead sponsor
Louisiana State University Health Sciences Center in New Orleans
Other
Eligibility
25 Years and older
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Nov 6, 2024 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Adding Chickpeas to the American Diet on Fecal Microbiota Composition and Markers of Inflammation

NCT02375347
View directory record Official record
Conditions
Inflammation
Interventions
Chickpea Enhanced Diet (Short term)
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 75 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 30, 2016 · Synced Oct 24, 2026, 4:46 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Vaccine Observation to Include All Communities for Equitable Science

NCT04770649
View directory record Official record
Conditions
Vaccine Response Impaired, Vaccine Adverse Reaction
Interventions
COVID-19 vaccine
Biological
Lead sponsor
Persephone Biosciences
Industry
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Apr 5, 2024 · Synced Oct 24, 2026, 4:46 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 Aug 18, 2026 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Resistant Starch Blend Gastrointestinal Impact

NCT03983772
View directory record Official record
Conditions
Quality of Life, Health, Subjective
Interventions
RS blend, Placebo
Dietary Supplement · Other
Lead sponsor
Metagenics, Inc.
Industry
Eligibility
21 Years to 65 Years
Enrollment
43 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Gig Harbor, Washington
Source: ClinicalTrials.gov public record
Updated Apr 6, 2022 · Synced Oct 24, 2026, 4:46 AM EDT
Recruiting Not applicable Interventional

A Pilot Study Examining Low Sulfur Diet as Treatment for Persistent Symptoms in Quiescent Crohn's Disease

NCT05849012
View directory record Official record
Conditions
Crohn's Disease in Remission
Interventions
Low Sulfur Diet, Usual Diet
Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Oct 24, 2026, 4:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Association Between Lactase Deficiency, and the Small Intestinal Microbiome in Adults.

NCT03860051
View directory record Official record
Conditions
Lactose Intolerance
Interventions
Not listed
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 75 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Mar 6, 2024 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional

A Growth and Hypoallergenicity Study of a New Formula for Infants With Cow Milk Allergy

NCT00664768
View directory record Official record
Conditions
Cow Milk Allergy
Interventions
Neocate Infant, new Neocate
Dietary Supplement
Lead sponsor
Nutricia North America
Industry
Eligibility
1 Day to 8 Months
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
22
States / cities
Chandler, Arizona • Tucson, Arizona • Bentonville, Arkansas + 18 more
Source: ClinicalTrials.gov public record
Updated Dec 9, 2020 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Blackcurrants Modify Gut Microbiota and Reduce Osteoporosis and CVD Risk

NCT04431960
View directory record Official record
Conditions
Postmenopausal Osteoporosis, Gut Microbiota, Cardiovascular Diseases
Interventions
blackcurrant (BC) extract
Drug
Lead sponsor
University of Connecticut
Other
Eligibility
45 Years to 60 Years · Female only
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 12, 2025 · Synced Oct 24, 2026, 4:46 AM EDT
Recruiting No phase listed Observational

Gut Microbiome and Treatment for Gynecological Cancer Patients Receiving Immunotherapy

NCT04957511
View directory record Official record
Conditions
Gynecologic Cancer, Immunotherapy, Gut Microbiome
Interventions
Not listed
Lead sponsor
Viome
Industry
Eligibility
18 Years and older · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Jan 29, 2025 · Synced Oct 24, 2026, 4:46 AM EDT
Withdrawn No phase listed Observational

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

NCT04100616
View directory record Official record
Conditions
Overweight and Obesity, Overweight or Obesity, Obesity, Obesity, Morbid, Obesity, Abdominal, Obesity; Familial, Obesity; Endocrine, Obesity, Visceral, Obesity Hypoventilation Syndrome
Interventions
No intervention
Other
Lead sponsor
ProgenaBiome
Other
Eligibility
18 Years and older
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 24, 2026, 4:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Quantification of Immune Cells in Women Using Contraception (CHIC II)

NCT01873170
View directory record Official record
Conditions
HIV, Immune Cells (Mucosal and Systemic), Contraception
Interventions
levonorgestrel exposure, DMPA exposure, etonogestrel exposure, IUD insertion, subdermal contraceptive implant insertion
Drug · Device
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 34 Years · Female only
Enrollment
326 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2020
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 27, 2021 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Microbiome Fructan Metabolism and Symptoms in Childhood IBS

NCT02842281
View directory record Official record
Conditions
Irritable Bowel Syndrome (IBS)
Interventions
Fructan, Maltodextrin
Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
7 Years to 17 Years
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 22, 2021 · Synced Oct 24, 2026, 4:46 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 21, 2022 · Synced Oct 24, 2026, 4:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Fiber-rich Foods, Weight Status, and the Gut Microbiota in NH Hispanic Adults at Risk for Food Insecurity

NCT05488912
View directory record Official record
Conditions
Food Insecurity, Overweight and Obesity
Interventions
Not listed
Lead sponsor
University of New Hampshire
Other
Eligibility
18 Years to 55 Years
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Durham, New Hampshire
Source: ClinicalTrials.gov public record
Updated Mar 28, 2025 · Synced Oct 24, 2026, 4:46 AM EDT
Active, not recruiting Not applicable Interventional

Response of Cardiometabolic Biomarkers and Gut Microbiota to Walnut Consumption

NCT05321277
View directory record Official record
Conditions
Cardiovascular Diseases
Interventions
Walnuts, No-nut diet
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
45 Years to 70 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Feb 10, 2026 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional

A Pilot Proof of Concept Study of the Effects of Administration of SCFA in Rheumatoid Arthritis (EASi-RA)

NCT05152615
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
Short Chain Fatty Acids (SCFA) Dietary Supplement
Dietary Supplement
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 24, 2024 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Early Phase 1 Interventional

Effects of Probiotics on the Gut Microbiome and Immune System in Operable Stage I-III Breast or Lung Cancer

NCT04857697
View directory record Official record
Conditions
Anatomic Stage I Breast Cancer AJCC v8, Anatomic Stage II Breast Cancer AJCC v8, Anatomic Stage III Breast Cancer AJCC v8, Breast Adenocarcinoma, Stage I Lung Cancer AJCC v8, Stage II Lung Cancer AJCC v8, Stage III Lung Cancer AJCC v8
Interventions
Biopsy, Biospecimen Collection, Probiotic, Therapeutic Conventional Surgery
Procedure · Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 21, 2023 · Synced Oct 24, 2026, 4:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Diet / Gut Microbiome Interaction and Influence on Inflammatory Disease in HIV Patients

NCT02610374
View directory record Official record
Conditions
HIV
Interventions
Agrarian Diet, Western-type Diet
Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 65 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 21, 2022 · Synced Oct 24, 2026, 4:46 AM EDT
Terminated No phase listed Observational

Gut Microbiome in Fecal Samples From Patients With Metastatic Cancer Undergoing Chemotherapy or Immunotherapy

NCT02960282
View directory record Official record
Conditions
Metastatic Carcinoma, Stage IV Colorectal Cancer, Stage IVA Colorectal Cancer, Stage IVB Colorectal Cancer
Interventions
Biospecimen Collection, Laboratory Biomarker Analysis
Procedure · Other
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 10, 2022 · Synced Oct 24, 2026, 4:46 AM EDT