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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo diet Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Beet Juice and Diet in Female Rowers

NCT06045845
View directory record Official record
Conditions
Dietary Habits, Nitrates, Exercise
Interventions
Beet Juice, Placebo
Dietary Supplement
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years to 30 Years · Female only
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Lawrence, Kansas
Source: ClinicalTrials.gov public record
Updated Feb 1, 2024 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D on Lipids

NCT00723385
View directory record Official record
Conditions
Hypercholesterolemia, Vitamin D Deficiency
Interventions
Vitamin D (1000 or 2000 IU/day), Placebo
Dietary Supplement · Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
130 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 7, 2015 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Dietary Nitrate for Heart Failure

NCT01682356
View directory record Official record
Conditions
Heart Failure, Hypertension, Pulmonary
Interventions
Beetroot juice
Dietary Supplement
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2023
U.S. locations
2
States / cities
Indianapolis, Indiana • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 3, 2024 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Instaflex and Joint Pain in Community Adults

NCT01956500
View directory record Official record
Conditions
Joint Pain, Stiffness, Function
Interventions
Instaflex, Placebo
Dietary Supplement
Lead sponsor
Appalachian State University
Other
Eligibility
50 Years to 75 Years
Enrollment
110 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 7, 2013 · Synced Sep 28, 2026, 11:56 AM EDT
Terminated Not applicable Interventional

The PRESS RA: Protein and Resistance Exercise Supplementation Study for Rheumatoid Arthritis

NCT02078375
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
Protein, Carbohydrate (Placebo), Resistance Exercise Program
Dietary Supplement · Other
Lead sponsor
Johns Hopkins University
Other
Eligibility
60 Years to 95 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 8, 2019 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Phase 2 Interventional Results available

Blood Lipopolysaccharide (LPS) Rifaximin Study

NCT02124512
View directory record Official record
Conditions
Obese, Insulin Resistance, Metabolic Syndrome
Interventions
Rifaximin SSD, Placebo
Drug · Other
Lead sponsor
Philip Kern
Other
Eligibility
35 Years to 65 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 20, 2019 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Probiotic Intake on Intestinal Permeability in Healthy Adults

NCT03611400
View directory record Official record
Conditions
Intestinal Barrier Function
Interventions
Probiotic, Placebo
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
21 Years to 50 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 20, 2019 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Phase 1 Interventional

Lipoic Acid as a Treatment for Acute Optic Neuritis

NCT01294176
View directory record Official record
Conditions
Optic Neuritis
Interventions
Lipoic Acid
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 65 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 25, 2019 · Synced Sep 28, 2026, 11:56 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Dietary Supplements on Muscle Mass and Function While Using GLP-1 Medication

NCT07806838
View directory record Official record
Conditions
Obesity & Overweight, Muscle Mass and Strength, Muscle Function
Interventions
Whey Protein Supplementation, Maltodextrin Placebo Capsules, Mixed Spice Capsules
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Sep 7, 2026 · Synced Sep 28, 2026, 11:56 AM EDT
Terminated Phase 2Phase 3 Interventional Results available

Fish Oil Versus Statins Versus Placebos in Reducing Atrial Fibrillation in Patients Undergoing Thoracic Surgery for Lung Cancer

NCT01259284
View directory record Official record
Conditions
Advanced Cancers
Interventions
Atorvastatin, Fish Oil Supplement, Placebo
Drug · Dietary Supplement · Other
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 6, 2012 · Synced Sep 28, 2026, 11:56 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Lycopene in Preventing Prostate Cancer in Healthy Participants

NCT00322114
View directory record Official record
Conditions
Prostate Cancer
Interventions
lycopene, placebo
Dietary Supplement · Other
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years and older · Male only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2006
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 19, 2013 · Synced Sep 28, 2026, 11:56 AM EDT
Not yet recruiting Not applicable Interventional

Pycnogenol (French Maritime Pine Bark) for the Treatment of Gulf War Illness

NCT07266571
View directory record Official record
Conditions
Gulf War Syndrome
Interventions
Placebo, Pycnogenol, 100mg, Pycnogenol, 200mg, Pycnogenol, 400mg, Pycnogenol, 600mg
Other · Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years and older · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 20, 2026 · Synced Sep 28, 2026, 11:56 AM EDT
Active, not recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Fisetin to Improve Vascular Function in Older Adults

NCT06133634
View directory record Official record
Conditions
Aging, Endothelial Dysfunction, Arterial Stiffness
Interventions
Fisetin, Placebo
Dietary Supplement · Other
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
65 Years and older
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Sep 24, 2026 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Acute Grape Seed Extract Supplementation on Muscle Metaboreflex in Healthy Young Individuals

NCT05945771
View directory record Official record
Conditions
Dietary Supplementation
Interventions
Grape seed extract
Dietary Supplement
Lead sponsor
California Baptist University
Other
Eligibility
18 Years to 30 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Riverside, California
Source: ClinicalTrials.gov public record
Updated Jul 13, 2023 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Not applicable Interventional

Docosahexaenoic Acid in the Treatment of Autism

NCT00577447
View directory record Official record
Conditions
Autism
Interventions
docosahexaenoic acid (DHA), Placebo
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
3 Years to 10 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 27, 2015 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nutrition Interventions to Support the Immune System in Response to Stress

NCT02053506
View directory record Official record
Conditions
Mitigation of Immune Function Decrements in Response to Stress
Interventions
Immune-enhancing nutritional beverage, Probiotics (BB-12), Placebo (for nutritional beverage and probiotic)
Dietary Supplement
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
18 Years to 45 Years
Enrollment
63 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 1, 2017 · Synced Sep 28, 2026, 11:56 AM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Nicotinamide Riboside for Treating Elevated Systolic Blood Pressure and Arterial Stiffness in Middle-aged and Older Adults

NCT03821623
View directory record Official record
Conditions
Hypertension, Aging
Interventions
Nicotinamide riboside, Placebo
Drug · Other
Lead sponsor
Douglas Seals
Other
Eligibility
50 Years and older
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 20, 2025 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Phase 3 Interventional Results available

Action to Control Cardiovascular Risk in Diabetes (ACCORD)

NCT00000620
View directory record Official record
Conditions
Atherosclerosis, Cardiovascular Diseases, Hypercholesterolemia, Hypertension, Diabetes Mellitus, Type 2, Diabetes Mellitus, Coronary Disease
Interventions
Anti-hyperglycemic Agents, Anti-hypertensive Agents, Blinded fenofibrate or placebo plus simvastatin
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
40 Years to 79 Years
Enrollment
10,251 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2012
U.S. locations
6
States / cities
Minneapolis, Minnesota • New York, New York • Winston-Salem, North Carolina + 3 more
Source: ClinicalTrials.gov public record
Updated Nov 21, 2016 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Phase 2 Interventional

Use of Omega-3 Fatty Acids for Perinatal Depression

NCT00402389
View directory record Official record
Conditions
Depression, Depression, Postpartum
Interventions
Omega-3 Fatty Acids (EPA plus DHA), Supportive psychotherapy, Placebo
Drug · Behavioral
Lead sponsor
University of Arizona
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Mar 28, 2013 · Synced Sep 28, 2026, 11:56 AM EDT
Not listed Not applicable Interventional

Viome Precision Nutritional Programs to Improve Clinical Outcomes for Mental Health Disorders

NCT06502717
View directory record Official record
Conditions
Mental Health Issue, Depression, Anxiety
Interventions
VIOME Precision Nutrition Program
Combination Product
Lead sponsor
Viome
Industry
Eligibility
25 Years to 75 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Bothell, Washington
Source: ClinicalTrials.gov public record
Updated Jan 28, 2025 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Phase 1 Interventional

Vitamin D as a Nutritional Neoadjuvant During Photodynamic Therapy of Basal Cell Carcinoma

NCT03467789
View directory record Official record
Conditions
Basal Cell Carcinoma, Basal Cell Nevus Syndrome
Interventions
Dietary Vitamin D3 pre-treatment, Photodynamic therapy, Serum Maintenance Vitamin D3
Drug · Radiation
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
Not listed
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
2
States / cities
Phoenix, Arizona • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 16, 2024 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Phase 1 Interventional Results available

Reducing Dyskinesia in Parkinson's Disease With Omega-3 Fatty Acids

NCT01563913
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Docosahexaenoic Acid (DHA), Placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
21 Years to 99 Years
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 28, 2018 · Synced Sep 28, 2026, 11:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Protein Blend Supplementation During Exercise Training on Muscle Growth and Strength

NCT01749189
View directory record Official record
Conditions
Muscle
Interventions
Blend, Whey, Placebo
Dietary Supplement
Lead sponsor
DuPont Nutrition and Health
Industry
Eligibility
18 Years to 35 Years · Male only
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Oct 6, 2019 · Synced Sep 28, 2026, 11:56 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Effect of a Synbiotic Supplement on a High-protein Diet

NCT03123510
View directory record Official record
Conditions
Obesity
Interventions
Bifidobacterium spp plus bimuno- galacto-oligosaccharides, Placebo
Dietary Supplement
Lead sponsor
South Dakota State University
Other
Eligibility
18 Years to 80 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017
U.S. locations
1
States / cities
Brookings, South Dakota
Source: ClinicalTrials.gov public record
Updated Apr 20, 2017 · Synced Sep 28, 2026, 11:56 AM EDT