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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: High Dose Supplement Clear all
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin K and Glucose Metabolism in Adults at Risk for Diabetes (Vita-K 'n' Adults Study)

NCT02366481
View directory record Official record
Conditions
Obesity, Insulin Resistance, Insulin Sensitivity, Beta-Cell Dysfunction, Prediabetes
Interventions
Placebo, Low-Dose Vitamin K2 Supplement (menaquinone-7; 90-mcg/d), High-Dose Vitamin K2 Supplement (menaquinone-7; 180-mcg/d)
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2020
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 19, 2019 · Synced Sep 21, 2026, 1:16 AM EDT
Active, not recruiting Phase 2 Interventional Results available

Vitamin D and Physical Activity on Bone Health

NCT01419730
View directory record Official record
Conditions
Bone Metabolism Biomarkers, Bone Mineral Density, Physical Fitness
Interventions
Vitamin D3, Physical Activity
Drug · Behavioral
Lead sponsor
University of Rochester
Other
Eligibility
18 Years to 99 Years · Female only
Enrollment
191 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2026
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Aug 4, 2026 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional

Effect of Supplement on Appetite and GLP-1

NCT06790771
View directory record Official record
Conditions
Hunger
Interventions
High Dose Supplement, Low Dose Supplement, Placebo
Dietary Supplement
Lead sponsor
Texas Christian University
Other
Eligibility
18 Years to 60 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Fort Worth, Texas
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Phase 3 Interventional Results available

Zoledronate in Preventing Osteoporosis and Bone Fractures in Patients With Locally Advanced Nonmetastatic Prostate Cancer Undergoing Radiation Therapy and Hormone Therapy

NCT00329797
View directory record Official record
Conditions
Osteoporosis, Prostate Cancer
Interventions
Calcium, Zoledronic acid, radiation therapy, LHRH, Vitamin D
Dietary Supplement · Radiation · Drug
Lead sponsor
Radiation Therapy Oncology Group
Network
Eligibility
18 Years and older · Male only
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2014
U.S. locations
80
States / cities
Chico, California • Los Angeles, California • Pomona, California + 66 more
Source: ClinicalTrials.gov public record
Updated Nov 28, 2017 · Synced Sep 21, 2026, 1:16 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Safety and Tolerability of 2 Dietary Supplement Beverages Designed to Maintain Healthy Blood Pressure.

NCT06442293
View directory record Official record
Conditions
Safety Issues, Tolerance
Interventions
Treatment 1, Treatment 2, Placebo
Dietary Supplement
Lead sponsor
USANA Health Sciences
Industry
Eligibility
18 Years to 50 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jun 3, 2024 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Combination Probiotic: BB-12 With LGG (Different Doses) in Treating Children With Autism Spectrum Disorder

NCT03514784
View directory record Official record
Conditions
Autism Spectrum Disorder, Gastrointestinal Symptoms
Interventions
BB-12 with LGG (Higher Dose), Placebo, BB-12 with LGG (Lower Dose)
Drug
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
4 Years to 16 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2025
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 13, 2026 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional

Effects of Exercise in People With Paraplegia

NCT01203150
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
Exercise
Other
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 65 Years
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Mar 23, 2015 · Synced Sep 21, 2026, 1:16 AM EDT
Terminated Phase 2 Interventional Results available

High Dose Vitamin D vs Standard Dose Vitamin D Study

NCT01988090
View directory record Official record
Conditions
Breast Cancer
Interventions
800 IU Vitamin D Supplement, 50,000 IU Vitamin D supplement
Drug
Lead sponsor
Mothaffar Rimawi
Other
Eligibility
18 Years and older · Female only
Enrollment
93 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
2
States / cities
St Louis, Missouri • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 8, 2021 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional

Efficacy of Vitamin D Supplementation in Obese Children

NCT02956408
View directory record Official record
Conditions
Obesity, Pediatric, Obesity, Childhood, Obesity, Morbid, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
5 Years to 11 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Phase 2 Interventional Results available

Treatment for Non-Alcoholic Fatty Liver With Different Doses of Vitamin E

NCT01792115
View directory record Official record
Conditions
Fatty Liver
Interventions
Vitamin E 200 IU/d, Vitamin E 400 IU/d, Vitamin E 800 IU/d, Diet and Exercise
Drug · Behavioral
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2019
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 3, 2020 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Xoçai Antioxidant Supplements on Atherosclerosis Risk Factors

NCT00666250
View directory record Official record
Conditions
Hypertension, Dyslipidemia, Hyperglycemia
Interventions
Xocai Activ drink
Dietary Supplement
Lead sponsor
University of Utah
Other
Eligibility
18 Years to 95 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Feb 7, 2016 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Lactoferrin at Two Doses vs. Active Control on Markers of Immune Function

NCT06012669
View directory record Official record
Conditions
Immune Health
Interventions
High dose Human Lactoferrin, Low dose Human Lactoferrin, Active Control Bovine Lactoferrin
Dietary Supplement
Lead sponsor
Midwest Center for Metabolic and Cardiovascular Research
Other
Eligibility
18 Years to 45 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
2
States / cities
Miami, Florida • Port Saint Lucie, Florida
Source: ClinicalTrials.gov public record
Updated Jun 10, 2025 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

PUFA Supplementation in Premature Infants

NCT01955044
View directory record Official record
Conditions
Premature, Extremely Low Birth Weight Infants, Polyunsaturated Fatty Acid Levels
Interventions
LCPUFA supplement, placebo
Dietary Supplement
Lead sponsor
Endeavor Health
Other
Eligibility
Up to 72 Hours
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
3
States / cities
Chicago, Illinois • Evanston, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 4, 2021 · Synced Sep 21, 2026, 1:16 AM EDT
Withdrawn Phase 2 Interventional

Derivatives of Omega-3 HUFA as Biomarkers of Traumatic Brain Injury

NCT02990091
View directory record Official record
Conditions
TBI
Interventions
Omega 3 fatty acid, Safflower seed oil
Drug · Dietary Supplement
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years to 55 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 12, 2022 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Berberine Supplementation, Sprint Interval Training, and Immune Function Study

NCT07480018
View directory record Official record
Conditions
Berberine, Sprint Training, Wellbeing, Anaerobic Power, Inflammation Biomarkers, Monocyte Function
Interventions
Berberine, Placebo, Sprint Interval Training
Dietary Supplement · Other
Lead sponsor
University of Northern Colorado
Other
Eligibility
18 Years to 45 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Greeley, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 4, 2026 · Synced Sep 21, 2026, 1:16 AM EDT
Terminated Phase 2 Interventional

Vitamin D Supplementation for Adults With Neurofibromatosis Type 1 (NF1)

NCT01968590
View directory record Official record
Conditions
Neurofibromatosis Type 1 (NF1)
Interventions
Cholecalciferol
Drug
Lead sponsor
University of Utah
Other
Eligibility
25 Years to 40 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
2
States / cities
Cincinnati, Ohio • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 24, 2022 · Synced Sep 21, 2026, 1:16 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Flavonoids in the Treatment of Endothelial Dysfunction in Children With Diabetes

NCT01307917
View directory record Official record
Conditions
Diabetic Nephropathy, Endothelial Dysfunction
Interventions
flavonoids
Dietary Supplement
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
12 Years to 21 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Amarillo, Texas
Source: ClinicalTrials.gov public record
Updated Dec 16, 2012 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Broccoli Sprout/Broccoli Seed Extract Supplement in Decreasing Toxicity in Heavy Smokers

NCT03402230
View directory record Official record
Conditions
Cigarette Smoking-Related Carcinoma, Tobacco-Related Carcinoma
Interventions
Broccoli Sprout/Broccoli Seed Extract Supplement, Laboratory Biomarker Analysis, Questionnaire Administration
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
49 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2022
U.S. locations
2
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Jun 27, 2023 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Phase 2 Interventional Results available

Tocilizumab to Prevent Clinical Decompensation in Hospitalized, Non-critically Ill Patients With COVID-19 Pneumonitis

NCT04331795
View directory record Official record
Conditions
COVID-19
Interventions
Tocilizumab
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 8, 2022 · Synced Sep 21, 2026, 1:16 AM EDT
Not listed Not applicable Interventional

Dietary Supplementation on Fat Oxidation

NCT06548048
View directory record Official record
Conditions
Overweight, Obesity
Interventions
Dietary supplement containing plant derived phenolics, Microcrystaline cellulose
Dietary Supplement
Lead sponsor
Brightseed
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Addison, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 11, 2024 · Synced Sep 21, 2026, 1:16 AM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

The Effect of Nutritional Supplementation on Actinic Purpura: A Pilot Study

NCT06840574
View directory record Official record
Conditions
Skin Health, Skin Aging of Face and Hands, Healthy, Ecchymosis
Interventions
Cyruta Plus: A Whole-Food Based Vitamin C supplement containing organic buckwheat (aerial parts) juice powder, organic buckwheat flour, bovine adrenal Cytosol™ extract, oat flour, honey, ascorbic acid, Low Dose Vitamin C, High Dose Vitamin C
Dietary Supplement
Lead sponsor
Standard Process Inc.
Industry
Eligibility
55 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Sep 21, 2026, 1:16 AM EDT
Completed Not applicable Interventional

Effect of Gum Arabic on Gastrointestinal Transit and Permeability

NCT03742076
View directory record Official record
Conditions
Diverticulitis
Interventions
High-dose prebiotic, Low-dose prebiotic, Placebo
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 80 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 9, 2023 · Synced Sep 21, 2026, 1:16 AM EDT
Recruiting Phase 2 Interventional

MitoQ and Ischemic Conditioning To Assess Vascular Health Outcomes

NCT06930638
View directory record Official record
Conditions
Stroke
Interventions
Ischemic Conditioning, Antioxidant Supplement
Device · Dietary Supplement
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years to 85 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 24, 2025 · Synced Sep 21, 2026, 1:16 AM EDT
Not yet recruiting Not applicable Interventional

Vitamin A Supplementation and Breast Milk Vitamin A Levels in Mothers of Preterm Infants

NCT07736768
View directory record Official record
Conditions
Premature, Preterm Infant Health, Vitamin A Deficiency, Human Milk, Breastfeeding
Interventions
Oral multivitamin containing vitamin A
Dietary Supplement
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
18 Years to 45 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Sep 21, 2026, 1:16 AM EDT