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ClinicalTrials.gov public records Last synced Sep 30, 2026, 8:34 AM EDT

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Showing 25–48 of 168 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: : Placebo for Probiotic Clear all
Active, not recruiting No phase listed Observational

Impact of GABA Probiotic Lactiplantibacillus Plantarum Lp815 on Sleep Outcomes in Participants with Self-Reported Sleep Disturbance

NCT06789718
View directory record Official record
Conditions
Insomnia (moderate)
Interventions
GABA Probiotic Lactiplantibacillus plantarum Lp815 (5 Billion cfu/dose), Placebo, Optional Sub-Study: Neurotransmitter Urine Test
Dietary Supplement · Other · Diagnostic Test
Lead sponsor
Verb Biotics LLC
Industry
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 23, 2025 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Early Phase 1 Interventional

Safety, Tolerability, and Pharmacodynamics of SYNB8802v1 in Subjects With History of Gastric Bypass Surgery or Short-bowel Syndrome

NCT05377112
View directory record Official record
Conditions
Enteric Hyperoxaluria
Interventions
SYNB8802v1, Placebo
Drug · Other
Lead sponsor
Synlogic
Industry
Eligibility
18 Years to 74 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Mar 17, 2023 · Synced Sep 30, 2026, 8:34 AM EDT
Not yet recruiting Phase 3 Interventional Accepts healthy volunteers

Povidone Iodine for Caries Prevention

NCT07741409
View directory record Official record
Conditions
Dental Caries
Interventions
Povidone Iodine 5% Soln,Top,Kit, Probiotics, Placebo
Drug · Dietary Supplement
Lead sponsor
Jeffrey A. Banas
Other
Eligibility
1 Year to 3 Years
Enrollment
174 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Aug 3, 2026 · Synced Sep 30, 2026, 8:34 AM EDT
Withdrawn Phase 2 Interventional

Probiotics for Girls With Recurring Urinary Tract Infections

NCT00789464
View directory record Official record
Conditions
Recurrent Urinary Tract Infection
Interventions
Lactobacillus reuteri DSM 17938, trimethoprim/sulfamethoxazole
Dietary Supplement · Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
3 Months to 17 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 18, 2020 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Not applicable Interventional

Acute Probiotic Supplementation and Endothelial Function

NCT04364074
View directory record Official record
Conditions
Coronary Artery Disease, Hypertension, Hyperlipidemias, Peripheral Vascular Diseases, Cerebral Arterial Diseases
Interventions
Goodbelly, Placebo
Dietary Supplement
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
21 Years to 89 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Wauwatosa, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 22, 2023 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Not applicable Interventional

Study to Evaluate the Efficacy of a Probiotic in Infantile Colic Symptoms Relief

NCT05432479
View directory record Official record
Conditions
Infantile Colic
Interventions
Probiotic, Placebo
Dietary Supplement
Lead sponsor
The Archer-Daniels-Midland Company
Industry
Eligibility
3 Weeks to 12 Weeks
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 25, 2026 · Synced Sep 30, 2026, 8:34 AM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Changes in Amino Acid Absorption After Adding a Probiotic to an Acute Protein Feeding

NCT06701604
View directory record Official record
Conditions
Amino Acid Absorption, Probiotic
Interventions
Single Strain Probiotic + Milk Protein, Placebo + Milk Protein
Dietary Supplement
Lead sponsor
The Archer-Daniels-Midland Company
Industry
Eligibility
18 Years to 35 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Belton, Texas
Source: ClinicalTrials.gov public record
Updated Nov 22, 2024 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Exercise, Milk Thistle, and Lactobacillus to Influence Plasma Bilirubin

NCT04717726
View directory record Official record
Conditions
Obesity
Interventions
Milk Thistle (MT), Lactobacillus Gasseri (LAC), Exercise (EX), Control (CON)
Dietary Supplement · Behavioral
Lead sponsor
Kyle Flack
Other
Eligibility
18 Years to 50 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Jul 28, 2023 · Synced Sep 30, 2026, 8:34 AM EDT
Withdrawn Phase 2 Interventional

Probiotics in Girls With Spina Bifida

NCT00767988
View directory record Official record
Conditions
Urinary Tract Infection
Interventions
Urex-cap-5 (2x10^9 cfu each of Lactobacillus reuteri RC-14 and Lactobacillus rhamnosus GR-1), Placebo
Dietary Supplement · Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
3 Months to 17 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 15, 2015 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Phase 3 Interventional Results available

A Probiotic Intervention to Prevent Relapse Following Hospitalization for Mania

NCT03383874
View directory record Official record
Conditions
Mania (Neurotic)
Interventions
Probio-Tec BG-VCap-6.5, Placebo
Combination Product · Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 19, 2025 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

How Does a Synbiotic Supplement Affect Iron Status During Iron Repletion in Iron Depleted Female Athletes?

NCT03793959
View directory record Official record
Conditions
Iron-deficiency
Interventions
Synbiotic Supplement, Placebo
Dietary Supplement
Lead sponsor
Marywood University
Other
Eligibility
18 Years and older · Female only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Scranton, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 4, 2019 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Phase 2 Interventional

Lactobacillus Johnsonii Supplementation in Adults With T1D

NCT03961347
View directory record Official record
Conditions
Type 1 Diabetes (T1D)
Interventions
L. johnsonii Probiotic, Placebo Capsule
Drug
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 45 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 18, 2026 · Synced Sep 30, 2026, 8:34 AM EDT
Withdrawn Phase 2 Interventional

Growth Hormone and Exclusion Diet Therapy in Juvenile Crohn's Disease

NCT01647412
View directory record Official record
Conditions
Crohn's Disease
Interventions
Growth Hormone, Nutraceutical Combination, Exclusion Diet, Placebo Growth Hormone
Drug · Dietary Supplement · Other
Lead sponsor
Columbia University
Other
Eligibility
10 Years to 17 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 13, 2015 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Bacillus Subtilis BS50 Supplementation on Gastrointestinal Symptoms in Healthy Adults

NCT05004454
View directory record Official record
Conditions
Gastrointestinal Health, Immune Health, Cardiovascular Health, Digestive Health
Interventions
Bacillus subtilis BS50 spore preparation, Maltodextrin
Dietary Supplement
Lead sponsor
BIO-CAT Microbials, LLC
Industry
Eligibility
30 Years to 65 Years
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Addison, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 5, 2023 · Synced Sep 30, 2026, 8:34 AM EDT
Active, not recruiting Not applicable Interventional

Impact of Lp299v on Vascular Function in Patients With PASC

NCT05227170
View directory record Official record
Conditions
COVID-19
Interventions
Lactobacillus Plantarum 299v Freeze Dried Capsule, Freeze Dried Potato Starch Capsule
Other
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years to 89 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated May 1, 2026 · Synced Sep 30, 2026, 8:34 AM EDT
Terminated Phase 2Phase 3 Interventional Accepts healthy volunteers

Trenev Trio/Healthy Trinity for Symptoms of Diarrhea-predominant Irritable Bowel Syndrome (IBS) and Functional Dyspepsia

NCT01268618
View directory record Official record
Conditions
IBS-D and Functional Dyspepsia
Interventions
Probiotic, Placebo
Dietary Supplement
Lead sponsor
Sprim Advanced Life Sciences
Other
Eligibility
18 Years to 75 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
2
States / cities
Duluth, Georgia • Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Jul 21, 2011 · Synced Sep 30, 2026, 8:34 AM EDT
Withdrawn Phase 2 Interventional

Probiotic Supplementation in Preventing Treatment-Related Diarrhea in Patients With Cancer Undergoing Chemotherapy

NCT01644097
View directory record Official record
Conditions
Diarrhea, Unspecified Adult Solid Tumor, Protocol Specific
Interventions
Lactobacillus plantarum strain 299v, Lactobacillus acidophilus probiotic, placebo, laboratory biomarker analysis, questionnaire administration, quality-of-life assessment, Bifidobacterium lactis probiotic supplement
Dietary Supplement · Other · Procedure
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2012
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Feb 14, 2014 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Phase 2 Interventional Results available

Impact of Probiotics for Reducing Infections in Veterans: The IMPROVE Study

NCT01321606
View directory record Official record
Conditions
Anti-biotic Resistance
Interventions
Lactobacillus rhamnosus HN001, sugar pill (placebo)
Dietary Supplement
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 3, 2018 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety of Lactobacillus Rhamnosus GG ATCC 53103 (LGG) in Healthy Volunteers

NCT00934453
View directory record Official record
Conditions
Healthy
Interventions
Lactobacillus rhamnosus GG ATCC 53103, Placebo
Biological
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 50 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 11, 2017 · Synced Sep 30, 2026, 8:34 AM EDT
Recruiting Not applicable Interventional

The Path Study: Cognitive and Inflammation Targeted Gut-brain Interventions in Alcohol; Probiotics, Alcohol, Transcutaneous Vagus Nerve Stimulation, and HIV Study

NCT05090267
View directory record Official record
Conditions
Cognition, Gut Microbiome
Interventions
Probiotic Supplement, Transcutaneous Vagal Nerve Stimulation (tVNS)
Dietary Supplement · Device
Lead sponsor
University of Florida
Other
Eligibility
35 Years to 70 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Coral Gables, Florida
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Sep 30, 2026, 8:34 AM EDT
Recruiting Phase 2 Interventional

CASCADE 2002: PROTECT Study, "PRObiotics to TrEat Anal preCancer Trial

NCT06949800
View directory record Official record
Conditions
HSIL, High Grade Squamous Intraepithelial Lesion, HPV-Related Squamous Cell Carcinoma, Anal HSIL
Interventions
EXE-346 Probiotic, Placebo, Usual Care High Resolution Anoscopy (HRA)
Drug · Procedure
Lead sponsor
University of California, San Francisco
Other
Eligibility
21 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Probiotic for Oral Health (PRO Health) Study

NCT03748017
View directory record Official record
Conditions
Oral Microbiome
Interventions
Placebo-Control Supplement, Streptococcus-Containing Probiotic Supplement
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
21 Years to 45 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Nov 28, 2023 · Synced Sep 30, 2026, 8:34 AM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

LpD3.5 Intervention Study in Older Adults- LISA-I Trial

NCT07794956
View directory record Official record
Conditions
Mild Cognitive Impairment (MCI), Cognition, Brain Aging, Microbiome Dysbiosis, Leaky Gut Syndrome, Gut Inflammation, Inflammaging
Interventions
LpD3.5, Placebo
Dietary Supplement
Lead sponsor
University of South Florida
Other
Eligibility
60 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 30, 2026, 8:34 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Adolescent Probiotics in Stressed Adolescents

NCT07565883
View directory record Official record
Conditions
Cognitive Ability, General, Immune System Function, Emotions
Interventions
Probiotics, placebo
Dietary Supplement
Lead sponsor
University of Utah
Other
Eligibility
12 Years to 20 Years
Enrollment
104 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
2
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 4, 2026 · Synced Sep 30, 2026, 8:34 AM EDT