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ClinicalTrials.gov public records Last synced Oct 25, 2026, 4:07 PM EDT

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Showing 385–408 of 680 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Intestinal Microbiome Clear all
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Modulating Early Life Microbiome Through Dietary Intervention in Crohn's Disease

NCT03850600
View directory record Official record
Conditions
Crohn Disease, Pregnancy
Interventions
Diet-CD
Other
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older · Female only
Enrollment
194 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2027
U.S. locations
2
States / cities
Worcester, Massachusetts • New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 6, 2025 · Synced Oct 25, 2026, 4:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Alcohol and Cannabis Co-Use and the Gut-Brain Axis

NCT04998006
View directory record Official record
Conditions
Cannabis Use, Alcohol Use, Inflammation
Interventions
Not listed
Lead sponsor
University of Colorado, Denver
Other
Eligibility
21 Years to 60 Years
Enrollment
77 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated May 15, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Botanical Blend on the Gut Microbiome and Gut-Skin-Axis in Small Intestinal Bacterial Overgrowth (SIBO)

NCT04867512
View directory record Official record
Conditions
Small Intestinal Bacterial Overgrowth (SIBO)
Interventions
Liquid Tincture, GI Detox, Olivirex
Dietary Supplement
Lead sponsor
Integrative Skin Science and Research
Industry
Eligibility
18 Years to 60 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated May 4, 2021 · Synced Oct 25, 2026, 4:07 PM EDT
Recruiting Phase 1Phase 2 Interventional

Snacks and Brain Health

NCT07348406
View directory record Official record
Conditions
Cognitive Assessment, Psychological Function, GI Health
Interventions
Pecan snack, Pretzel snack
Biological
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
50 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Sep 8, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Recruiting No phase listed Observational

Intestinal Microbiota in Stem Cell Transplant Transplant Admission

NCT04623424
View directory record Official record
Conditions
Stem Cell Transplant Complications
Interventions
intestinal microbiota
Diagnostic Test
Lead sponsor
Henry Ford Health System
Other
Eligibility
18 Years to 80 Years
Enrollment
255 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2028
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 24, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Not listed Phase 2 Interventional

Microbiota Transfer Therapy for Children and Adults With Both Pitt Hopkins Syndrome and Gastrointestinal Disorders

NCT06321796
View directory record Official record
Conditions
Pitt Hopkins Syndrome
Interventions
MTP-101P, Vancomycin, Magnesium Citrate, Antacid, Placebo MTP-101P, Placebo Vancomycin
Combination Product
Lead sponsor
Gut-Brain-Axis Therapeutics Inc.
Other
Eligibility
5 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Mar 20, 2024 · Synced Oct 25, 2026, 4:07 PM EDT
Recruiting Not applicable Interventional

Treatment Research Investigating Depression Effects on Neuroimmune Targets (TRIDENT)

NCT05136703
View directory record Official record
Conditions
Depression, HIV-1-infection, Inflammation
Interventions
Cognitive-Behavioral Therapy for Adherence and Depression (CBT-AD), Antiretroviral Therapy (ART) Adherence Counseling
Behavioral
Lead sponsor
Florida International University
Other
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
2
States / cities
Coral Gables, Florida • Miami, Florida
Source: ClinicalTrials.gov public record
Updated Feb 6, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Recruiting Early Phase 1 Interventional

Probiotic Administration for Adolescent Depression

NCT06898788
View directory record Official record
Conditions
Depression
Interventions
Visbiome, Placebo
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
15 Years to 24 Years
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jul 14, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Effects of Freeze Dried Strawberry Powder Supplementation on Cardiovascular Risk Factors and Gut Microbiome

NCT03522974
View directory record Official record
Conditions
Cardiovascular Risk Factor
Interventions
Strawberry powder, Placebo powder
Dietary Supplement
Lead sponsor
University of Arizona
Other
Eligibility
30 Years to 65 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Feb 15, 2024 · Synced Oct 25, 2026, 4:07 PM EDT
Not listed Early Phase 1 Interventional Accepts healthy volunteers

Salt and Gut Study

NCT04958148
View directory record Official record
Conditions
High Blood Pressure
Interventions
Salt pills, Placebo pills
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 50 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jul 12, 2021 · Synced Oct 25, 2026, 4:07 PM EDT
Recruiting No phase listed Observational

Avera Cancer Sequencing and Analytics Protocol (ASAP)

NCT05142033
View directory record Official record
Conditions
Cancer, Cancer Diagnosis, Early Detection of Cancer, Breast Cancer, Lung Cancer, Colon Cancer, GI Cancer, Gynecologic Cancer, Ovarian Cancer, Endometrial Cancer, CNS Cancer, Hematologic Cancer
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
18 Years and older
Enrollment
25,000 participants
Timeline
2021 – 2026
U.S. locations
6
States / cities
Marshall, Minnesota • Aberdeen, South Dakota • Mitchell, South Dakota + 3 more
Source: ClinicalTrials.gov public record
Updated Mar 27, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Not applicable Interventional

Effect of Daily Consumption of Glycomacropeptide on Gut Microbiome and Blood Functional Proteome of Subjects With Irritable Bowel Syndrome

NCT05482464
View directory record Official record
Conditions
Inflammatory Bowel Syndrome
Interventions
Casein glycomacropeptide (CGMP)
Dietary Supplement
Lead sponsor
Oregon State University
Other
Eligibility
18 Years to 30 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Corvallis, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 4, 2025 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Almonds: Digestive Health and Immune Function of Adults and Children

NCT01973595
View directory record Official record
Conditions
Healthy
Interventions
Almonds, Then no almonds, No Almonds, Then almonds
Dietary Supplement · Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 40 Years
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 26, 2016 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Mediterranean Diet and the Gut Microbiome

NCT03269032
View directory record Official record
Conditions
Irritable Bowel Syndrome
Interventions
American Diet, Mediterranean-style Diet
Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2021
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 22, 2023 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ellagic Acid, Urolithin and Colonic Microbial Communities Affected by Walnut Consumption

NCT04066816
View directory record Official record
Conditions
Colo-rectal Cancer, Colon Cancer, Diet Habit
Interventions
Walnuts
Other
Lead sponsor
UConn Health
Other
Eligibility
50 Years to 65 Years
Enrollment
47 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 26, 2021 · Synced Oct 25, 2026, 4:07 PM EDT
Recruiting Phase 2 Interventional

Combined Oral Contraceptive Pill and Resistance Starch

NCT06852365
View directory record Official record
Conditions
Metabolic Syndrome, Polycystic Ovary Syndrome
Interventions
wheat dextrin, Oral Contraceptives, Low-Dose, Maltodextrin
Dietary Supplement · Drug
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 1, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effect of Lactobacillus Rhamnosus GG (LGG) on Infant Colic

NCT01279265
View directory record Official record
Conditions
Colic, Inflammation
Interventions
Nutramigen with Enflora, Nutramigen A+
Dietary Supplement
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
3 Weeks to 3 Months
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Nov 11, 2015 · Synced Oct 25, 2026, 4:07 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Evaluation of Fecal Microbiome Changes After Antegrade Continence Enema Placement and Initiation of Bowel Flush Regimen

NCT05821309
View directory record Official record
Conditions
Constipation
Interventions
PEG 3350, PEG-3350 with electrolytes, Glycerin
Drug
Lead sponsor
Indiana University
Other
Eligibility
2 Years to 18 Years
Enrollment
65 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
2
States / cities
Carmel, Indiana • Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Aug 18, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Prebiotic and Probiotic Modulation of the Gut Microbiota-gut-brain Axis During Acute Stress

NCT05392556
View directory record Official record
Conditions
Stress Physiology
Interventions
Probiotic, Prebiotic, Placebo
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 39 Years
Enrollment
73 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 26, 2025 · Synced Oct 25, 2026, 4:07 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

The Effects of Agro-ecological Farming Systems on Human Health

NCT05575258
View directory record Official record
Conditions
Inflammatory Response
Interventions
44-Day Diet Conventionally Sourced - YELLOW Diet, 44-Day Diet Agro-Ecologically Sourced - GREEN Diet
Other
Lead sponsor
Utah State University
Other
Eligibility
35 Years to 60 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Logan, Utah
Source: ClinicalTrials.gov public record
Updated Jul 15, 2024 · Synced Oct 25, 2026, 4:07 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Association Between Gut Microbiome and Dietary Determinants and Vaccine Response

NCT05239403
View directory record Official record
Conditions
Influenza
Interventions
Biospecimen Collection, Questionnaire Administration
Procedure · Other
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 12, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Investigation of the Gut Microbiome and Statin Response

NCT04098003
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Rosuvastatin, Placebo
Drug
Lead sponsor
Sony Tuteja
Other
Eligibility
18 Years to 65 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2026
U.S. locations
1
States / cities
Phildelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 9, 2026 · Synced Oct 25, 2026, 4:07 PM EDT
Completed Not applicable Interventional

Mind-body Approach and Gut Microbiota in Osteoarthritis

NCT05186714
View directory record Official record
Conditions
Osteoarthritis
Interventions
Tai Chi versus wellness education
Behavioral
Lead sponsor
Tufts Medical Center
Other
Eligibility
55 Years and older
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 9, 2025 · Synced Oct 25, 2026, 4:07 PM 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 25, 2026, 4:07 PM EDT