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ClinicalTrials.gov public records Last synced Oct 20, 2026, 1:22 AM EDT

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Showing 49–72 of 985 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Microbiome Clear all
Completed Phase 1 Interventional Results available

Effect of Bismuth Subsalicylate on the Gut Microbiome and Host Response in Healthy Adults

NCT05930197
View directory record Official record
Conditions
Healthy Adults
Interventions
Bismuth subsalicylate
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 50 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Oct 20, 2026, 1:22 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 20, 2026, 1:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Gut Microbiota Composition in Hispanic and Non-Hispanic Children.

NCT03990350
View directory record Official record
Conditions
Obesity
Interventions
Fecal Sample Collection, Physical Activity Questionnaire, Food Frequency Questionnaire, 24-hour dietary recall diary
Other
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
6 Years to 12 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Wilmington, Delaware
Source: ClinicalTrials.gov public record
Updated Jun 30, 2020 · Synced Oct 20, 2026, 1:22 AM EDT
Completed No phase listed Observational

Identifying Biomarkers of Gastro Intestinal Comorbidities in Autism Spectrum Disorder

NCT07744217
View directory record Official record
Conditions
Autism, Gastro Intestinal Diseases
Interventions
Not listed
Lead sponsor
The Center for Discovery
Other
Eligibility
5 Years to 19 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Harris, New York
Source: ClinicalTrials.gov public record
Updated Aug 4, 2026 · Synced Oct 20, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

ButyraGen™, Short Chain Fatty Acids and Gut Microbiome

NCT05601635
View directory record Official record
Conditions
Healthy
Interventions
ButyraGen™
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
18 Years and older
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 25, 2023 · Synced Oct 20, 2026, 1:22 AM EDT
Recruiting No phase listed Observational

Fecal Microbiota Transplant National Registry

NCT03325855
View directory record Official record
Conditions
Fecal Microbiota Transplantation, Clostridium Difficile Infection, Gut Microbiome
Interventions
None - Observational
Other
Lead sponsor
American Gastroenterological Association
Other
Eligibility
Not listed
Enrollment
4,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2027
U.S. locations
52
States / cities
Phoenix, Arizona • Los Angeles, California • Redwood City, California + 39 more
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Oct 20, 2026, 1:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Biogeography of the Oral Microbiome

NCT05672953
View directory record Official record
Conditions
Oral Microbiome
Interventions
Not listed
Lead sponsor
Viome
Industry
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Bothell, Washington
Source: ClinicalTrials.gov public record
Updated Jan 5, 2023 · Synced Oct 20, 2026, 1:22 AM EDT
Completed Phase 4 Interventional Results available

Vitamin D and Prebiotics for Intestinal Health in Cystic Fibrosis

NCT04118010
View directory record Official record
Conditions
Cystic Fibrosis, Dysbiosis
Interventions
Vitamin D3, Placebo vitamin D3, Inulin, Placebo Inulin
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Feb 7, 2024 · Synced Oct 20, 2026, 1:22 AM EDT
Active, not recruiting Phase 1Phase 2 Interventional

TEMPO Study: Trimethoprim-Sulfamethoxazole in Granulomatosis With Polyangiitis

NCT03919435
View directory record Official record
Conditions
Granulomatosis With Polyangiitis, Wegener Granulomatosis
Interventions
Trimethoprim Sulfamethoxazole
Drug
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 25, 2026 · Synced Oct 20, 2026, 1:22 AM EDT
Completed No phase listed Observational

Gut and Intratumoral Microbiome Effect on the Neoadjuvant Chemotherapy-induced Immunosurveillance in Triple Negative Breast Cancer

NCT03586297
View directory record Official record
Conditions
Triple Negative Breast Cancer
Interventions
Not listed
Lead sponsor
Hackensack Meridian Health
Other
Eligibility
18 Years and older · Female only
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2025
U.S. locations
3
States / cities
New Haven, Connecticut • Washington D.C., District of Columbia • Hackensack, New Jersey
Source: ClinicalTrials.gov public record
Updated Mar 27, 2026 · Synced Oct 20, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Microbiome and Resilience to Sleep and Circadian Disruption

NCT03747367
View directory record Official record
Conditions
Sleep Deprivation, Circadian Dysregulation, Stress
Interventions
Insufficient Sleep, Prebiotic, Placebo
Behavioral · Dietary Supplement
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
18 Years to 45 Years
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 17, 2026 · Synced Oct 20, 2026, 1:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Acne Vulgaris Related Microbiology and Serology

NCT04056598
View directory record Official record
Conditions
Acne Vulgaris
Interventions
Study of humoral immunity
Diagnostic Test
Lead sponsor
Sanofi
Industry
Eligibility
18 Years to 40 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 6, 2021 · Synced Oct 20, 2026, 1:22 AM EDT
Recruiting Not applicable Interventional

Study to Understand Relationship Between Gut Health and Toxicities of Hormonal Breast Cancer Treatment

NCT07553234
View directory record Official record
Conditions
Breast Cancer
Interventions
Stool Sampling, Chia Seeds
Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 28, 2026 · Synced Oct 20, 2026, 1:22 AM EDT
Active, not recruiting No phase listed Observational

Is There a Microbiome Associated With Poor Growth in Preterm Infants?

NCT03761498
View directory record Official record
Conditions
Growth Disorders, Growth Failure, Prematurity
Interventions
Caloric Requirement
Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
Not listed
Enrollment
118 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Apr 1, 2025 · Synced Oct 20, 2026, 1:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Changes in Vaginal, Cervical and Uterine Microflora With Levonorgestrel Intrauterine Device Placement

NCT01496898
View directory record Official record
Conditions
Human Microbiome, Metagenome, Contraception, Cytokine
Interventions
Not listed
Lead sponsor
University of Utah
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jan 13, 2016 · Synced Oct 20, 2026, 1:22 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Probiotics and the Gut Microbiome in Obese Hispanic Youth

NCT03115385
View directory record Official record
Conditions
Obesity, Abdominal, Adiposity
Interventions
VSL#3, Placebo
Dietary Supplement
Lead sponsor
University of Southern California
Other
Eligibility
12 Years to 18 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 14, 2017 · Synced Oct 20, 2026, 1:22 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Characterizing Skin Microbiome Change in Atopic Dermatitis

NCT04800185
View directory record Official record
Conditions
Atopic Dermatitis, Atopic Dermatitis Eczema
Interventions
Crisaborole 2% Top Oint, Skin Microbiome Swabs
Drug · Genetic
Lead sponsor
University of California, Irvine
Other
Eligibility
2 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Irvine, California
Source: ClinicalTrials.gov public record
Updated Feb 2, 2024 · Synced Oct 20, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Black Raspberry Phytochemicals on Oral Microbiome in Current Smokers and Non-smokers

NCT02439255
View directory record Official record
Conditions
Healthy Subject, Tobacco Use Disorder
Interventions
Laboratory Biomarker Analysis, Phytochemical, Placebo, Screening Questionnaire Administration
Other · Dietary Supplement
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years to 50 Years
Enrollment
148 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2022
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 5, 2022 · Synced Oct 20, 2026, 1:22 AM EDT
Recruiting Phase 2 Interventional

Microbiome Metabolites and Alcohol in HIV to Reduce CVD RCT

NCT05288790
View directory record Official record
Conditions
Microtia, Dysbiosis, Alcohol Drinking, HIV Infections, Cardiovascular Diseases
Interventions
Probiotic, Placebo
Dietary Supplement
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 89 Years
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 27, 2026 · Synced Oct 20, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

MiCrobiome dieT Study

NCT03610477
View directory record Official record
Conditions
Healthy
Interventions
Medium chain triglycerides, Long chain triglycerides
Dietary Supplement
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 70 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Nov 1, 2019 · Synced Oct 20, 2026, 1:22 AM EDT
Recruiting No phase listed Observational

Optimizing Nutrition and Milk (Opti-NuM) Project

NCT06870981
View directory record Official record
Conditions
Very Low Birth Weight Baby, Early Nutrition and the Preterm Infant, Nutritional Requirements, Human Milk Fortification, Human Milk Microbiome, Human Milk Feeding, Human Milk Nutrition, Growth &Amp; Development
Interventions
Opti-NuM is an observational secondary use of data/samples study, the investigators will analyze information and specimens from the MaxiMoM platform RCTs. No interventions form part of this study.
Other
Lead sponsor
The Hospital for Sick Children
Other
Eligibility
1 Hour to 21 Days
Enrollment
1,100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2027
U.S. locations
2
States / cities
Palo Alto, California • San Diego, California
Source: ClinicalTrials.gov public record
Updated Mar 11, 2025 · Synced Oct 20, 2026, 1:22 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Cognition, Flavonoids, Exercise, Gut Microbiome

NCT06495190
View directory record Official record
Conditions
Cognitive Decline, Mild
Interventions
Blueberry, Walking, Placebo, Stretching
Dietary Supplement · Behavioral
Lead sponsor
Appalachian State University
Other
Eligibility
65 Years to 85 Years
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2028
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 12, 2025 · Synced Oct 20, 2026, 1:22 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Gut Butyrate and Blood Pressure in African Americans

NCT04415333
View directory record Official record
Conditions
Hypertension
Interventions
Sodium Butyrate 5 mmol, Sodium Butyrate 80 mmol
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
30 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Greensboro, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 18, 2023 · Synced Oct 20, 2026, 1:22 AM EDT
Recruiting Not applicable Interventional

Effect of Anti-inflammatory Diet in Systemic Lupus Erythematous

NCT07713940
View directory record Official record
Conditions
Systemic Lupus Erthematosus (SLE)
Interventions
anti-inflammatory diet
Dietary Supplement
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jul 20, 2026 · Synced Oct 20, 2026, 1:22 AM EDT