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Showing 1–24 of 91 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Microbiome, Human Clear all
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Berries, Inflammation, and Gut Microbiome

NCT04100200
View directory record Official record
Conditions
Overweight or Obesity, Healthy
Interventions
Mixed berries, FOS, Control, Combination
Dietary Supplement
Lead sponsor
Clinical Nutrition Research Center, Illinois Institute of Technology
Industry
Eligibility
20 Years to 60 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Prolonged Fasting on Microbiome and HDL

NCT03487679
View directory record Official record
Conditions
Fasting
Interventions
Fasting
Other
Lead sponsor
University of California, Davis
Other
Eligibility
20 Years to 80 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Sep 26, 2018 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Diet Modulation of Bacterial Sulfur and Bile Acid Metabolism and Colon Cancer Risk

NCT03550885
View directory record Official record
Conditions
Colorectal Cancer
Interventions
High taurine and saturated fat diet, Low in taurine and saturated fat diet
Other
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
45 Years to 75 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 5, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Choline From Eggs vs. Supplements on the Generation of TMAO in Humans

NCT03039023
View directory record Official record
Conditions
Cardiovascular Risk Factor
Interventions
Choline Bitartrate, Pre-cooked, pre-peeled whole hardboiled eggs, Egg whites from pre-cooked, pre-peeled hardboiled eggs, Phosphatidylcholine capsules
Dietary Supplement · Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
86 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Phase 4 Interventional

NICU Antibiotics and Outcomes Trial

NCT03997266
View directory record Official record
Conditions
Microbial Colonization, Extreme Prematurity, Early-Onset Neonatal Sepsis, Late-Onset Neonatal Sepsis, Necrotizing Enterocolitis of Newborn, Death; Neonatal
Interventions
Ampicillin, Gentamycin, Normal saline
Drug
Lead sponsor
Michael Morowitz
Other
Eligibility
Up to 4 Hours
Enrollment
359 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
14
States / cities
Mobile, Alabama • San Diego, California • New Haven, Connecticut + 10 more
Source: ClinicalTrials.gov public record
Updated Apr 23, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Not yet recruiting Phase 4 Interventional Accepts healthy volunteers

Vaginal Estradiol vs Moisturizer to Improve Postmenopausal Vaginal Aging Symptoms and the Microbiome in Women Living With HIV

NCT07526948
View directory record Official record
Conditions
Menopausal Complaints, Vaginal Atrophy, Genitourinary Symptoms, HIV (Human Immunodeficiency Virus), Menopause Related Conditions, Vaginitis, Perimenopause
Interventions
Vaginal estradiol tablets, Vaginal moisturizer
Drug · Other
Lead sponsor
Albert Einstein College of Medicine
Other
Eligibility
40 Years to 70 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2031
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Apr 13, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Cultures Before and After Decolonization in Community Dwelling Adults With Current S. Aureus Colonization

NCT04222699
View directory record Official record
Conditions
Human Microbiome
Interventions
Mupirocin calcium ointment, 2%, Topical Chlorhexidine, 4%
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 13, 2020 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impacts of Fruit on the Gut Health and Human Health

NCT05063929
View directory record Official record
Conditions
Cardiometabolic Health, Healthy Aging, Cognition
Interventions
Fruit (2 cup eq), Fruit restriction (1/2 cup eq)
Other
Lead sponsor
San Diego State University
Other
Eligibility
30 Years to 70 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jan 7, 2025 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Antimicrobial-free Production of Beef Cattle's Affect on Gut Microbiome

NCT04023604
View directory record Official record
Conditions
Diet Modification
Interventions
Controlled diet with beef raised without antibiotics, Controlled diet with beef produced in conventional systems
Other
Lead sponsor
Purdue University
Other
Eligibility
21 Years to 69 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Sep 27, 2022 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Mechanism of Microbiome-induced Insulin Resistance in Humans (Aim2)

NCT02127125
View directory record Official record
Conditions
Insulin Sensitivity
Interventions
Maltodextrin, Synbiotic, Sevelamer
Drug
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
18 Years to 65 Years
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Sep 10, 2020 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Human Milk and Infant Intestinal Microbiome Study

NCT03181269
View directory record Official record
Conditions
Breast Feeding, Human Microbiome
Interventions
Intervention education, Placebo Education
Other
Lead sponsor
University of Virginia
Other
Eligibility
Not listed
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Dec 20, 2018 · Synced Jul 23, 2026, 1:31 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Is the Human Microbiome Altered in Patients With Axial Spondyloarthritis?

NCT02962479
View directory record Official record
Conditions
Axial Spondyloarthritis, Ankylosing Spondylitis
Interventions
Not listed
Lead sponsor
Eyal Kedar
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Potsdam, New York
Source: ClinicalTrials.gov public record
Updated Nov 10, 2016 · Synced Jul 23, 2026, 1:31 PM EDT
Not yet recruiting Phase 4 Interventional

Impact of Probiotics on Gut Microbiome During Antibiotic Prophylaxis in Elective Orthopedic Surgery

NCT06791993
View directory record Official record
Conditions
Dysbiosis, Gut -microbiota, Microbiome Analysis, Probiotic, Antibiotic Prophylaxis
Interventions
Placebo Capsule, Probiotic with Human Milk Oligosaccharides (HMO)
Drug · Dietary Supplement
Lead sponsor
Acibadem Maslak Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 23, 2025 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Targeted Microbiome Transplant in Atopic Dermatitis

NCT03151148
View directory record Official record
Conditions
Atopic Dermatitis (AD)
Interventions
TMT Lotion, Placebo Lotion
Biological · Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 80 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
2
States / cities
San Diego, California • Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 16, 2020 · Synced Jul 23, 2026, 1:31 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Alternation in the Human Microbiome With Commonly Used Topical Medications

NCT03437005
View directory record Official record
Conditions
Healthy
Interventions
Desonide 0.05%, Ketoconazole 2%
Drug
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2026
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Feb 19, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Safety and Efficacy of a Prebiotic Blend in Healthy Humans

NCT07514741
View directory record Official record
Conditions
Healthy Adult Participants
Interventions
Fiber Blend 1 (Low Dose), Fiber Blend 2 (High Dose), Placebo
Dietary Supplement · Other
Lead sponsor
LOAM Science
Other
Eligibility
18 Years to 60 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
West Hollywood, California
Source: ClinicalTrials.gov public record
Updated Apr 6, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Systems Biology of Flu Vaccine in Healthy Adults With and Without the Use of Antibiotics

NCT02154061
View directory record Official record
Conditions
Influenza
Interventions
IIV Flu Vaccine, Metronidazole, Neomycin, Vancomycin
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years to 40 Years
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 14, 2018 · Synced Jul 23, 2026, 1:31 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Sources of Bacterial Contamination in Human Milk Samples From the MiLC Trial

NCT03371511
View directory record Official record
Conditions
Bacterial Communities
Interventions
Not listed
Lead sponsor
Cornell University
Other
Eligibility
18 Years and older · Female only
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Jan 13, 2019 · Synced Jul 23, 2026, 1:31 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Reducing Metabolic Dysregulation in Dyads

NCT06117241
View directory record Official record
Conditions
Colorectal Cancer, Inflammation, Nutrition Related Cancer
Interventions
IMAGINE HEALTHY
Behavioral
Lead sponsor
University of South Carolina
Other
Eligibility
9 Years to 55 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2028
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Jul 23, 2026, 1:31 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 Feb 26, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Impact of High Dietary Fiber on Microbiome and Vaccine Responses

NCT05565586
View directory record Official record
Conditions
Influenza
Interventions
High-Fiber Diet (HFD), Prebiotic Food-Enriched Diet (PreFED)
Dietary Supplement
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2029
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of S. Boulardii and Amoxicillin/Clavulanate on Gut Microbiota

NCT01473368
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Saccharomyces boulardii, Amoxicillin Clavulanate
Dietary Supplement · Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 3, 2017 · Synced Jul 23, 2026, 1:31 PM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Food DNA Digestion

NCT06687226
View directory record Official record
Conditions
Digestion Rate
Interventions
Reconstitutable food powder
Dietary Supplement
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 7, 2026 · Synced Jul 23, 2026, 1:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Investigating the Detection of Bovine and Soy Proteins in Human Milk

NCT04851340
View directory record Official record
Conditions
Microbiome, Stress, Food Allergy in Infants
Interventions
Cow's Milk, Soy Milk
Other
Lead sponsor
University of Idaho
Other
Eligibility
18 Years and older · Female only
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Moscow, Idaho
Source: ClinicalTrials.gov public record
Updated Jan 23, 2025 · Synced Jul 23, 2026, 1:31 PM EDT