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ClinicalTrials.gov public records Last synced Oct 21, 2026, 1:22 AM EDT

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Showing 169–192 of 1,014 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Microbiome Clear all
Not listed Not applicable Interventional Accepts healthy volunteers

Examining the Change in Microbiome Diversity and Urine Metabolites After Lignite Extract Use

NCT03026621
View directory record Official record
Conditions
Microbiome
Interventions
Lignite Extract, Herbal tea
Dietary Supplement · Other
Lead sponsor
Seraphic Group Inc
Industry
Eligibility
18 Years to 80 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 20, 2017 · Synced Oct 21, 2026, 1:22 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Assessing the Endometrial Environment in Recurrent Pregnancy Loss and Unexplained Infertility

NCT03401918
View directory record Official record
Conditions
Recurrent Pregnancy Loss, Unexplained Infertility
Interventions
Uterine ERA and microbiome testing, Oral antibiotics and vaginal probiotics
Diagnostic Test · Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2021
U.S. locations
1
States / cities
Sunnyvale, California
Source: ClinicalTrials.gov public record
Updated Apr 1, 2025 · Synced Oct 21, 2026, 1:22 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Study of a Prebiotic Supplement to Mitigate Excessive Weight Gain Among Physicians in Residency

NCT04498455
View directory record Official record
Conditions
Weight Gain Trajectory, Metabolic Syndrome
Interventions
Prebiotin
Dietary Supplement
Lead sponsor
Baylor University
Other
Eligibility
Not listed
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Waco, Texas
Source: ClinicalTrials.gov public record
Updated Aug 17, 2020 · Synced Oct 21, 2026, 1:22 AM EDT
Terminated Phase 2 Interventional

UNLOCKED: A Phase 2, Open-label Trial With KB195 in Subjects With a Urea Cycle Disorder

NCT03933410
View directory record Official record
Conditions
Urea Cycle Disorder
Interventions
KB195
Drug
Lead sponsor
Kaleido Biosciences
Industry
Eligibility
18 Years to 65 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
6
States / cities
Washington D.C., District of Columbia • Tampa, Florida • Baltimore, Maryland + 3 more
Source: ClinicalTrials.gov public record
Updated Jan 25, 2022 · Synced Oct 21, 2026, 1:22 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Prebiotic Effects of California Grapes on Gut Health and Cardiometabolic Health in Overweight Men and Women

NCT06544954
View directory record Official record
Conditions
Arterial Stiffness, Blood Pressure, Dysbiosis, Inflammation, Permeability; Increased
Interventions
Freeze-dried grape powder, Placebo powder
Dietary Supplement · Other
Lead sponsor
University of California, Davis
Other
Eligibility
45 Years to 70 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 13, 2026 · Synced Oct 21, 2026, 1:22 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Impact of Weizmannia (Bacillus) Coagulans JBI-YZ6.3 on Gut Health and Fecal Microbiome Changes

NCT07388264
View directory record Official record
Conditions
Gastrointestinal Symptoms, Constipation, Gut Health, Gastrointestinal Function
Interventions
Weizmannia (Bacillus) coagulans JBI-YZ6.3, Placebo
Dietary Supplement
Lead sponsor
Lindenwood University
Other
Eligibility
18 Years to 50 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Saint Charles, Missouri
Source: ClinicalTrials.gov public record
Updated Feb 5, 2026 · Synced Oct 21, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Healthy Unique Lipids From Almonds

NCT05782218
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
Almonds, Coconut
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Nov 28, 2023 · Synced Oct 21, 2026, 1:22 AM EDT
Not listed Not applicable Interventional

Effects of a Multispecies Probiotic on Migraine

NCT04696458
View directory record Official record
Conditions
Migraine, Irritable Bowel Syndrome, Headache, Migraine
Interventions
Lactobacillus plantarum (CECT7484 and CECT7485)/ Pediococcus acidilactici (CECT7483), Placebo Comparator: Placebo
Dietary Supplement · Other
Lead sponsor
Scripps Health
Other
Eligibility
18 Years to 75 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Nov 23, 2022 · Synced Oct 21, 2026, 1:22 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Dietary Fiber Effects on the Microbiome and Satiety

NCT04611217
View directory record Official record
Conditions
Dietary Fiber
Interventions
Dietary fiber: 10-25g, Dietary fiber: 5g
Other
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
20 Years to 55 Years
Enrollment
88 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 22, 2025 · Synced Oct 21, 2026, 1:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Examining the Distal Gut Microbiome After Spinal Cord Injury

NCT03319225
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
Not listed
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Oct 9, 2018 · Synced Oct 21, 2026, 1:22 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

The Effects of Zinc Di-(Dibutyryl Lisinate) on Skin Health and the Skin Microbiome in Photoaged Skin

NCT06096649
View directory record Official record
Conditions
Photoaging
Interventions
Topical Vehicle + Zinc Di-(dibutyryl lisinate), Topical Vehicle
Other
Lead sponsor
Integrative Skin Science and Research
Industry
Eligibility
40 Years to 60 Years · Female only
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated Oct 24, 2023 · Synced Oct 21, 2026, 1:22 AM EDT
Active, not recruiting Not applicable Interventional

Gut Microbe Composition, Exercise, and Breast Breast Cancer Survivors

NCT04088708
View directory record Official record
Conditions
Breast Cancer, Gut Microbiome, Exercise, Fatigue
Interventions
Aerobic Exercise Training, Attention Control
Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 74 Years · Female only
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 16, 2025 · Synced Oct 21, 2026, 1:22 AM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

The Role of Gut Microbiome in Predicting Comorbidities and Complications in Children With Inflammatory Bowel Disease

NCT05652491
View directory record Official record
Conditions
Inflammatory Bowel Disease, Crohn's Disease, Ulcerative Colitis
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
Up to 20 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
2
States / cities
Bethesda, Maryland • Falls Church, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 1, 2023 · Synced Oct 21, 2026, 1:22 AM EDT
Not yet recruiting Phase 2 Interventional

PFAS Clinical Trial

NCT07836023
View directory record Official record
Conditions
Environmental Exposure
Interventions
Cholestyramine, Centrum
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 23, 2026 · Synced Oct 21, 2026, 1:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Atopic Dermatitis (AD) and Food Allergy

NCT03168113
View directory record Official record
Conditions
Atopic Dermatitis (AD), Non-atopic Healthy Controls
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
4 Years to 17 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 28, 2018 · Synced Oct 21, 2026, 1:22 AM EDT
Not yet recruiting Not applicable Interventional

Efficacy of Different Disinfection Technologies in Molar Non-Surgical Retreatment

NCT07469150
View directory record Official record
Conditions
Apical Periodontitis
Interventions
GentleWave System, Conventional rotary instrumentation with passive ultrasonic irrigation
Procedure
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
16 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2030
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Apr 8, 2026 · Synced Oct 21, 2026, 1:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Microbiome of Donor Iron Deficient Study

NCT02990988
View directory record Official record
Conditions
Iron Deficiency
Interventions
Not listed
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 75 Years
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 19, 2022 · Synced Oct 21, 2026, 1:22 AM EDT
Completed Phase 2 Interventional

Urinary Microbiome Changes Following Administration of 500 mg of NDS-446 in Women With Dry OAB at 12 Weeks

NCT05557279
View directory record Official record
Conditions
Overactive Bladder
Interventions
500 mg NDS-446
Drug
Lead sponsor
Loyola University
Other
Eligibility
18 Years to 99 Years · Female only
Enrollment
53 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 17, 2026 · Synced Oct 21, 2026, 1:22 AM 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 21, 2026, 1:22 AM 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 29, 2026 · Synced Oct 21, 2026, 1:22 AM EDT
Completed No phase listed Observational

The Microenvironment in Barrett's Esophagus

NCT03060642
View directory record Official record
Conditions
Barrett Esophagus, Esophageal Adenocarcinoma
Interventions
Tethered capsule sponge, Electronic nose device
Device
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
155 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
3
States / cities
Rochester, Minnesota • New York, New York • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 5, 2024 · Synced Oct 21, 2026, 1:22 AM EDT
Enrolling by invitation Not applicable Interventional

Assessing Microbiome in Primary Anterior Cervical Fusion Patients

NCT07877766
View directory record Official record
Conditions
Cervical Stenosis, Myelopathy, Cervical Spondylosis With Myelopathy, Degenerative Disc Disease, Radiculopathy
Interventions
Primary Anterior Cervical Discectomy Procedures
Procedure
Lead sponsor
Hospital for Special Surgery, New York
Other
Eligibility
18 Years to 80 Years
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 21, 2026, 1:22 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Supplementation of Cholecalciferol and Related Active Metabolites Through Bioenhancing Layer's Eggs

NCT07859280
View directory record Official record
Conditions
Healthy Adult Participants, Vitamin D Insufficiency
Interventions
Vitamin D3 bioenhanced eggs, 25(OH)D3 bioenhanced eggs
Dietary Supplement
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 40 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2027 – 2029
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 21, 2026, 1:22 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Ambrosia: Evaluating the Effects of a Food-As-Medicine Platform on Gut Microbiome Composition and Metabolism

NCT06091813
View directory record Official record
Conditions
Impact of Dietary Chages Directed by Medical Nutrition Therapy on Gut Microbiome Composition
Interventions
Nutrition Counseling
Behavioral
Lead sponsor
Persephone Biosciences
Industry
Eligibility
18 Years to 64 Years
Enrollment
546 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Jul 31, 2025 · Synced Oct 21, 2026, 1:22 AM EDT