Independent directory Public ClinicalTrials.gov records United States
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ClinicalTrials.gov public records Last synced Jun 10, 2026, 3:21 AM EDT

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Showing 1–24 of 30 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Methylnaltrexone on GI Transit in Healthy Volunteers

NCT01055704
Conditions
Gastric Motility Disorder
Interventions
Methylnaltrexone only, Codeine only, Methylnaltrexone + codeine, Placebo + placebo
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Rochester, Minnesota
Conditions
Colorectal Cancer, Anal Cancer, Sexual Dysfunction
Interventions
Mind-Body Group Intervention
Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Conditions
Health, Wellness, Quality of Life
Interventions
A ready-to-mix beverage containing protein, fiber, and electrolytes
Dietary Supplement
Lead sponsor
PepsiCo Global R&D
Industry
Eligibility
21 Years to 75 Years
Enrollment
133 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Del Mar, California
Recruiting Not applicable Interventional Accepts healthy volunteers

Kimchi and Gut Health

NCT07435831
Conditions
Healthy Adult Participants
Interventions
60 grams per day of intervention food
Other
Lead sponsor
University of California, Davis
Other
Eligibility
19 Years to 70 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2029
U.S. locations
2
States / cities
Davis, California
Completed Phase 1 Interventional Accepts healthy volunteers

Ph 1b: Safety & Immunogenicity of Ad5 Based Oral Norovirus Vaccine

NCT04854746
Conditions
Norovirus Infections
Interventions
VXA-GI.1.NN, Placebo Tablet
Biological
Lead sponsor
Vaxart
Industry
Eligibility
55 Years to 80 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
3
States / cities
Cypress, California • New Orleans, Louisiana • Austin, Texas
Conditions
Digestion, Abdominal Pain, GI Disorders
Interventions
Radicle GI Health Placebo Control Form 1, Radicle GI Health Active Study Product 1.1 Usage, Radicle GI Health Placebo Control Form 2, Radicle GI Health Active Study Product 2.1 Usage, Radicle GI Health Active Study Product 2.2 Usage, Radicle GI Health Placebo Control Form 3, Radicle GI Health Active Study Product 3.1 Usage
Dietary Supplement
Lead sponsor
Radicle Science
Industry
Eligibility
21 Years to 105 Years
Enrollment
2,180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Del Mar, California
Conditions
Abdominal Pain, GI Disorders, Digestion
Interventions
Radicle GI Health Placebo Control Form 1, Radicle GI Health Active Study Product 1.1 Usage, Radicle GI Health Placebo Control Form 2, Radicle GI Health Active Study Product 2.1 Usage, Radicle GI Health Placebo Control Form 3, Radicle GI Health Active Study Product 3.1 Usage, Radicle GI Health Placebo Control Form 4, Radicle GI Health Active Study Product 4.1 Usage, Radicle GI Health Placebo Control Form 5, Radicle GI Health Active Study Product 5.1 Usage, Radicle GI Health Placebo Control Form 7, Radicle GI Health Active Study Product 7.1 Usage, Radicle GI Health Placebo Control 7.2, Radicle GI Health Active Study Product 7.2.1 Usage, Radicle GI Health Placebo Control 7.3.0, Radicle GI Health Active Study Product 7.3.1 Usage, Radicle GI Health Placebo Control 7.4.0, Radicle GI Health Active Study Product 7.4.1 Usage
Dietary Supplement
Lead sponsor
Radicle Science
Industry
Eligibility
21 Years to 105 Years
Enrollment
4,607 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Del Mar, California
Conditions
Gas and Bloating, Diarrhea, Constipation
Interventions
GI Health Active Product 1, GI Health Product Placebo Control
Dietary Supplement
Lead sponsor
Radicle Science
Industry
Eligibility
21 Years to 105 Years
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Del Mar, California
Conditions
Malignant Digestive System Neoplasm
Interventions
Discussion, Interview, Survey Administration
Procedure · Other
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Recruiting Not applicable Interventional Accepts healthy volunteers

Effect of a Fermented Dairy Protein With Prebiotic Fiber on GI Complaints

NCT06946017
Conditions
Digestive Health, Quality of Life
Interventions
Fermented dairy protein with prebiotic fiber supplement, Control placebo
Dietary Supplement
Lead sponsor
Arizona State University
Other
Eligibility
18 Years to 50 Years
Enrollment
114 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Phoenix, Arizona
Completed Not applicable Interventional Accepts healthy volunteers

Protein-Prebiotic Wellbeing Study

NCT05303753
Conditions
Digestive Health, Quality of Life
Interventions
fermented dairy protein with prebiotic fiber
Other
Lead sponsor
Arizona State University
Other
Eligibility
18 Years to 35 Years
Enrollment
98 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Phoenix, Arizona
Conditions
Gastrointestinal, Gut Health
Interventions
Bifidobacterium pseudocatenulatum, Placebo
Dietary Supplement
Lead sponsor
Synbiotic Health
Industry
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Los Angeles, California
Conditions
DPYD Gene Mutation, Gastrointestinal Cancer, Health Care Seeking Behavior
Interventions
Focus Group, Discrete Choice
Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Not yet recruiting Phase 1Phase 2 Interventional

Snacks and Brain Health

NCT07348406
Conditions
Cognitive Assessment, Psychological Function, GI Health
Interventions
Pecan snack, Pretzel snack
Biological
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
50 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Lubbock, Texas
Conditions
GI Health
Interventions
GI Product Form - Control, GI Health Product Form - Active
Dietary Supplement
Lead sponsor
Radicle Science
Industry
Eligibility
21 Years to 105 Years
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Del Mar, California
Conditions
Colorectal Cancer, Healthy Lifestyle, Behavior, Health, Health Behavior, Gastrointestinal Cancers
Interventions
RISE Personalized Self-Management Training (PSMT), Standardized Self-Management Training (SSMT)
Behavioral
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
2
States / cities
Los Angeles, California
Conditions
Colorectal Cancer
Interventions
Use of Interactive Voice Response (IVR) system to improve adherence to GI appointments and prep procedures
Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
Not listed
Enrollment
3,610 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Minneapolis, Minnesota
Conditions
Gastrointestinal Disease, Gastrointestinal Disorders, Nervous System
Interventions
Nonspecific Hypnotherapy for Relaxation, Gut-Directed Hypnotherapy (GDH), 3-month Follow-Up
Other
Lead sponsor
University of Central Florida
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
Orlando, Florida
Conditions
GI Colonization of Vancomycin-resistant Enterococcus
Interventions
probiotics, yogurt
Dietary Supplement
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 70 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Portland, Oregon
Conditions
GI Health
Interventions
GI Product Placebo Control, Active Product 1, Active Product 2, Active Product 3, Active Product 4, Active Product 5
Dietary Supplement
Lead sponsor
Radicle Science
Industry
Eligibility
21 Years to 105 Years
Enrollment
1,501 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Del Mar, California
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Influence of Diet on GI Health

NCT04783142
Conditions
Healthy
Interventions
High-fiber, low-protein diet, Low-fiber, high-protein diet
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
2
States / cities
Rochester, Minnesota
Not yet recruiting No phase listed Observational Accepts healthy volunteers

Correlation of Toxins With Gastrointestinal (GI) and Overall Health

NCT06278311
Conditions
Gastrointestinal Diseases
Interventions
Not listed
Lead sponsor
Vibrant America Clinical Lab
Industry
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
2
States / cities
Los Angeles, California • Santa Clara, California
Conditions
Cancer, Cancer Diagnosis, Early Detection of Cancer, Breast Cancer, Lung Cancer, Colon Cancer, GI Cancer, Gynecologic Cancer, Ovarian Cancer, Endometrial Cancer, CNS Cancer, Hematologic Cancer
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
18 Years and older
Enrollment
25,000 participants
Timeline
2021 – 2026
U.S. locations
6
States / cities
Marshall, Minnesota • Aberdeen, South Dakota • Mitchell, South Dakota + 3 more
Completed Not applicable Interventional Accepts healthy volunteers

Dose Effects of SCF on Calcium Metabolism and GI Microflora in Adolescents

NCT01660503
Conditions
Osteoporosis
Interventions
0 grams SCF, 10 grams SCF, 20 grams SCF
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
9 Years to 13 Years · Female only
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
West Lafayette, Indiana