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Showing 1–24 of 949 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Microbiome Clear all
Completed No phase listed Observational Accepts healthy volunteers

Farms, Animals and Adolescents: Reinforcing the Microbiome

NCT03189849
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
7 Years to 13 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 25, 2017 · Synced Jul 21, 2026, 11:52 AM EDT
Withdrawn No phase listed Observational

Diet, Physical Activity and Body Composition Changes During R-CHOP

NCT04293900
View directory record Official record
Conditions
Non-Hodgkin Lymphoma, DLBCL, Diffuse Large B Cell Lymphoma
Interventions
24-hour dietary recall, Hand grip strength, International Physical Activity Questionnaire, Patient-reported outcomes survey, Pittsburgh Sleep Quality Index, Functional Assessment of Cancer Treatment - Lymphoma, urine sample (optional), fecal sample (optional)
Other
Lead sponsor
George Washington University
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Oct 5, 2020 · Synced Jul 21, 2026, 11:52 AM EDT
Completed No phase listed Observational

Gastrointestinal Microbiome Influence on the Development of Bronchopulmonary Dysplasia

NCT03229967
View directory record Official record
Conditions
Bronchopulmonary Dysplasia
Interventions
16S rRNA stool microbiome sequencing.
Diagnostic Test
Lead sponsor
University of Tennessee
Other
Eligibility
0 Days to 7 Days
Enrollment
197 participants
Timeline
2017 – 2020
U.S. locations
2
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated May 9, 2023 · Synced Jul 21, 2026, 11:52 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 16, 2023 · Synced Jul 21, 2026, 11:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Red and Processed Meat Effects on the Metabolome and Microbiome

NCT05274906
View directory record Official record
Conditions
Controlled Feeding Trial, Healthy Eating Index, Red Meat, Meat
Interventions
Randomized, cross-over controlled feeding trial testing a Healthy Eating Index 2015 (HEI-2015) diet with and without red and processed meat
Other
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
18 Years to 50 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 4, 2024 · Synced Jul 21, 2026, 11:52 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Discrimination and the Brain-Gut-Microbiome (BGM) Axis

NCT05120908
View directory record Official record
Conditions
Discrimination, Racial, Social Isolation, Stress
Interventions
Not listed
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
266 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 9, 2025 · Synced Jul 21, 2026, 11:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Anti-inflammatory Effect and Associated Mechanisms of Mango Consumption

NCT04726293
View directory record Official record
Conditions
Overweight or Obesity, Healthy
Interventions
Mango, Control
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
20 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 10, 2025 · Synced Jul 21, 2026, 11:52 AM EDT
Recruiting Not applicable Interventional

Maternal Probiotic Supplementation for Improved Outcomes in Infants of Diabetic Mothers

NCT05467150
View directory record Official record
Conditions
Infant of Diabetic Mother
Interventions
Probiotic Supplement
Dietary Supplement
Lead sponsor
University of Minnesota
Other
Eligibility
21 Years to 45 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 11, 2025 · Synced Jul 21, 2026, 11:52 AM EDT
Not listed Not applicable Interventional

Gastrointestinal Microbiome Study of Appendiceal Cancer

NCT02599116
View directory record Official record
Conditions
Pseudomyxoma Peritonei, Appendiceal Neoplasm, Cancer, Appendiceal
Interventions
Bio-specimen collection, Questionnaire
Other
Lead sponsor
Mercy Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 26, 2023 · Synced Jul 21, 2026, 11:52 AM EDT
Active, not recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Lipidome and Microbiome Profile of Acne

NCT02713607
View directory record Official record
Conditions
Acne Vulgaris
Interventions
Doxycycline
Drug
Lead sponsor
University of California, Davis
Other
Eligibility
15 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2027
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Feb 9, 2026 · Synced Jul 21, 2026, 11:52 AM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Vaginal Microbiome Seeding and Health Outcomes in Cesarean-delivered Neonates.

NCT03298334
View directory record Official record
Conditions
Cesarean Delivery Affecting Newborn, Obesity, Childhood, Intestinal Microbiome, Microbiota, Host Microbial Interactions, Gastrointestinal Microbiome
Interventions
Vaginal Seeding, No Vaginal Seeding
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
0 Days to 50 Years
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2029
U.S. locations
1
States / cities
Falls Church, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 7, 2025 · Synced Jul 21, 2026, 11:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Study to Determine the Effect of Synbiotics in Patients With Pre-diabetes

NCT04428606
View directory record Official record
Conditions
PreDiabetes
Interventions
Metabolic Rheostat, Butyrate Ultra, Placebo
Dietary Supplement
Lead sponsor
Zhaoping Li
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 15, 2022 · Synced Jul 21, 2026, 11:52 AM EDT
Completed Not applicable Interventional

Childhood Obesity Microbiome Study

NCT04770311
View directory record Official record
Conditions
Pediatric Obesity
Interventions
Microbiome friendly diet
Behavioral
Lead sponsor
Duke University
Other
Eligibility
6 Years to 11 Years
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 14, 2022 · Synced Jul 21, 2026, 11:52 AM EDT
Active, not recruiting No phase listed Observational

REMBRANDT: REcovery of the MicroBiome fRom Antibiotics for Dental implanTs

NCT05622721
View directory record Official record
Conditions
Dysbiosis, Clostridium Difficile, Pet-Human Bonding, Antibiotic-Associated Colitis
Interventions
Not listed
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 7, 2026 · Synced Jul 21, 2026, 11:52 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Oral Microbiome and Pancreatic Cancer

NCT03302637
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
16S rRNA gene sequencing assay
Other
Lead sponsor
NYU Langone Health
Other
Eligibility
55 Years to 74 Years
Enrollment
732 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1992 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 5, 2017 · Synced Jul 21, 2026, 11:52 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Shifts in the Respiratory Microbiome and Clinical Outcomes of SARS-CoV-2

NCT04815018
View directory record Official record
Conditions
SARS-CoV-2 Infection, Bacterial Respiratory Tract Infection, Viral Respiratory Tract Infection
Interventions
Not listed
Lead sponsor
Pathnostics
Industry
Eligibility
60 Years and older
Enrollment
185 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
4
States / cities
Delaware, Ohio • Granville, Ohio • Westerville, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 29, 2021 · Synced Jul 21, 2026, 11:52 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Influence of Honey-flavored Yogurt on Low-grade Inflammation and Gut Health in Middle to Older Aged Women.

NCT04248127
View directory record Official record
Conditions
Overweight
Interventions
Honey sweetened yogurt, Sugar sweetened yogurt
Other
Lead sponsor
University of California, Davis
Other
Eligibility
45 Years to 65 Years · Female only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Feb 9, 2026 · Synced Jul 21, 2026, 11:52 AM EDT
Completed Phase 2 Interventional Results available

The Effects of Patiromer on Serum Potassium Level and Gut Microbiome of ESRD Patients With Hyperkalemia

NCT03326583
View directory record Official record
Conditions
ESRD, Hyperkalemia, End Stage Renal Disease
Interventions
Patiromer
Drug
Lead sponsor
Dominic Raj
Other
Eligibility
18 Years to 85 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated May 8, 2023 · Synced Jul 21, 2026, 11:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Taste Perception, Salivary Proteins & the Oral Microbiome

NCT04107688
View directory record Official record
Conditions
Saliva Altered, Taste, Altered
Interventions
Control, CPE
Other
Lead sponsor
Rutgers University
Other
Eligibility
18 Years to 45 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated May 13, 2024 · Synced Jul 21, 2026, 11:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Fiber Effectively Educates & Directs the Microbiome Study

NCT06395324
View directory record Official record
Conditions
Microbial Colonization
Interventions
High arabinose diet
Other
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 50 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Aug 26, 2025 · Synced Jul 21, 2026, 11:52 AM EDT
Recruiting Phase 2 Interventional

Modulation of the Gut Microbiome With Pembrolizumab Following Chemotherapy in Resectable Pancreatic Cancer

NCT05462496
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
Biopsy, FOLFIRINOX, Ciprofloxacin, Metronidazole, Pembrolizumab, Surgical Resection
Procedure · Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
19 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 14, 2024 · Synced Jul 21, 2026, 11:52 AM EDT
Active, not recruiting No phase listed Observational

Leveraging Artificial Intelligence and Multi-Omics Data to Predict Opioid Addiction

NCT06540105
View directory record Official record
Conditions
Opioid Use Disorder, Addiction, Opioid
Interventions
Not listed
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Jul 21, 2026, 11:52 AM 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 14, 2016 · Synced Jul 21, 2026, 11:52 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 May 5, 2026 · Synced Jul 21, 2026, 11:52 AM EDT