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ClinicalTrials.gov public records Last synced Oct 4, 2026, 4:14 AM EDT

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Showing 25–48 of 298 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin A supplementation Clear all
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Exercise and NutraStem (NT-020): Effects on Stem Cells

NCT01847027
View directory record Official record
Conditions
Adult Stem Cell Proliferation
Interventions
NutraStem, Placebo
Drug
Lead sponsor
University of North Texas Health Science Center
Other
Eligibility
50 Years to 70 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2017
U.S. locations
1
States / cities
Fort Worth, Texas
Source: ClinicalTrials.gov public record
Updated May 29, 2019 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Phase 1 Interventional

Vitamin C Supplementation as a Preventive Treatment of Diabetic Peripheral Neuropathy

NCT00634998
View directory record Official record
Conditions
Diabetic Neuropathies
Interventions
Vitamin C, Placebo
Dietary Supplement
Lead sponsor
Washington State University
Other
Eligibility
50 Years to 70 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Apr 27, 2023 · Synced Oct 4, 2026, 4:14 AM EDT
Not listed Phase 4 Interventional

The Effect of Vitamin D Supplementation on Calcium Excretion in Thalassemia: a Dose Response Study

NCT01323608
View directory record Official record
Conditions
Thalassemia Major
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
6 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 19, 2011 · Synced Oct 4, 2026, 4:14 AM EDT
Withdrawn Not applicable Interventional

Vitamin C & Exercise Induced Bronchoconstriction (EIB)

NCT03610932
View directory record Official record
Conditions
Exercise-induced Bronchospasm
Interventions
Vitamin C, Placebo
Dietary Supplement · Other
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Dec 13, 2019 · Synced Oct 4, 2026, 4:14 AM EDT
Completed No phase listed Observational Results available

Prevalence of Thiamine Deficiency in Hospitalized Non-Alcoholic Veterans

NCT05480943
View directory record Official record
Conditions
Thiamine Deficiency, Thiamine Deficiency; Sequelae
Interventions
Thiamine repletion
Dietary Supplement
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
206 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Reno, Nevada
Source: ClinicalTrials.gov public record
Updated Aug 12, 2026 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D Supplementation as a Neoadjuvant for Photodynamic Therapy of Actinic Keratoses

NCT04140292
View directory record Official record
Conditions
Actinic Keratosis
Interventions
Photodynamic therapy (PDT), Vitamin D3
Drug
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 24, 2022 · Synced Oct 4, 2026, 4:14 AM EDT
Terminated Phase 4 Interventional Results available

Mothers' Own Milk Optimization for Preterm Infants Project (MoMO PIP) Pilot Study

NCT04629534
View directory record Official record
Conditions
Vitamin D Deficiency, Nutritional Deficiency
Interventions
High dose Cholecalciferol, Cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
0 Days to 45 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Mar 15, 2023 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Phase 1 Interventional

Cord Blood Plus Vitamin D and Omega 3s in T1D

NCT00873925
View directory record Official record
Conditions
Type 1 Diabetes
Interventions
Autologous UCB, Omega 3 FA, Vitamin D
Biological · Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
1 Year to 18 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 4, 2013 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Phase 2 Interventional Results available

Optimal Vitamin D3 Supplementation Strategies for Acute Fracture Healing

NCT02786498
View directory record Official record
Conditions
Fracture
Interventions
Vitamin D3, Placebo
Drug · Other
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years to 50 Years
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 31, 2022 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Status Impacts Inflammation and Risk of Infections During Pregnancy

NCT01815047
View directory record Official record
Conditions
Inflammation, Infection
Interventions
Vitamin D3 Supplementation
Dietary Supplement
Lead sponsor
Cornell University
Other
Eligibility
13 Years to 18 Years · Female only
Enrollment
85 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2019
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Oct 28, 2019 · Synced Oct 4, 2026, 4:14 AM EDT
Terminated Phase 1 Interventional

Vitamin D3 (Vit D3) Supplementation and T Cell Immunomodulation in Patients With Newly Diagnosed Operative Invasive Ductal Breast Carcinoma

NCT01816555
View directory record Official record
Conditions
Newly Diagnosed Operative Invasive Ductal Breast Carcinoma Stage I-II
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years and older · Female only
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 22, 2015 · Synced Oct 4, 2026, 4:14 AM EDT
Not listed Not applicable Interventional

Combined Effects of Diabetes Self-Management Education and Nutritional Supplementation on Visual Function and Retinopathy

NCT04120077
View directory record Official record
Conditions
Diabetes Mellitus, Diabetic Retinopathy
Interventions
EyePromise DVS, EyePromise DVS plus EyePromise EZTears
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
18 Years to 85 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 23, 2021 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Phase 1 Interventional Results available

Study to Evaluate Romosozumab in Children and Adolescents With Osteogenesis Imperfecta

NCT04545554
View directory record Official record
Conditions
Osteogenesis Imperfecta
Interventions
Romosozumab, Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Amgen
Industry
Eligibility
5 Years to 17 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
3
States / cities
Indianapolis, Indiana • Nashville, Tennessee • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Apr 15, 2024 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of a Short Course of Gamma Tocopherol Supplementation in Adult Subjects

NCT02610829
View directory record Official record
Conditions
Gamma Tocopherol Serum Levels
Interventions
Gamma tocopherol
Dietary Supplement
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 50 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 27, 2018 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Not applicable Interventional Results available

Vitamin E Supplementation in Hyperinsulinism/Hyperammonemia Syndrome

NCT03797222
View directory record Official record
Conditions
Hyperinsulinism-Hyperammonemia Syndrome
Interventions
Vitamin E
Dietary Supplement
Lead sponsor
Elizabeth A Rosenfeld
Other
Eligibility
1 Year to 40 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 25, 2022 · Synced Oct 4, 2026, 4:14 AM EDT
Withdrawn Not applicable Interventional

Healing Minds II: Biofeedback, Breathing Practices, Nutrition and Exercise Counseling in Children and Adolescents With ADHD

NCT07180602
View directory record Official record
Conditions
Attention Deficit Disorder With Hyperactivity (ADHD)
Interventions
Heart Math Biofeedback Breathing Practices, Nutrition Counseling combined with Exercise Counseling
Behavioral
Lead sponsor
Hoskinson Health and Wellness Clinic
Industry
Eligibility
7 Years to 18 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Gillette, Wyoming
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of a Multi-vitamin Supplement in Adult Females

NCT03828097
View directory record Official record
Conditions
Health, Subjective
Interventions
Experimental supplement, Placebo
Dietary Supplement
Lead sponsor
Auburn University
Other
Eligibility
21 Years to 40 Years · Female only
Enrollment
94 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Auburn, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 28, 2020 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Not applicable Interventional

Vitamin and Mineral Supplementation Improves Micronutrient Status in Older Adults

NCT03061409
View directory record Official record
Conditions
Nutrient Deficiency
Interventions
Pharmavite Nature Made Multi for Him 50+, Placebo
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
45 Years to 75 Years
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 10, 2019 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Treatment of Non-Anemic Iron Deficiency in Pregnancy

NCT05423249
View directory record Official record
Conditions
Non-anemic Iron Deficiency
Interventions
Ferrous sulfate, Prenatal, Docusate Sodium, Ascorbic Acid 500Mg Tab, Placebo
Drug
Lead sponsor
Stony Brook University
Other
Eligibility
18 Years to 55 Years · Female only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
3
States / cities
Bohemia, New York • Commack, New York • East Setauket, New York
Source: ClinicalTrials.gov public record
Updated Nov 29, 2024 · Synced Oct 4, 2026, 4:14 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of a Nutritional Supplement on Metabolic Health

NCT02239198
View directory record Official record
Conditions
Cardiovascular Disease Prevention
Interventions
Nutrition bar
Other
Lead sponsor
UCSF Benioff Children's Hospital Oakland
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Apr 18, 2017 · Synced Oct 4, 2026, 4:14 AM EDT
Recruiting Phase 3 Interventional

A Trial of Etelcalcetide in Pediatric Participants With Secondary Hyperparathyroidism and Chronic Kidney Disease on Hemodialysis

NCT03633708
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Etelcalcetide, Standard of Care
Drug · Other
Lead sponsor
Amgen
Industry
Eligibility
0 Years to 18 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2029
U.S. locations
10
States / cities
Los Angeles, California • Aurora, Colorado • Kansas City, Missouri + 7 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2026 · Synced Oct 4, 2026, 4:14 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 17, 2024 · Synced Oct 4, 2026, 4:14 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 28, 2026 · Synced Oct 4, 2026, 4:14 AM EDT
Recruiting Phase 1Phase 2 Interventional

Durvalumab in Different Combinations With Pralatrexate, Romidepsin and Oral 5-Azacitidine for Lymphoma

NCT03161223
View directory record Official record
Conditions
Lymphoma, T-Cell
Interventions
Durvalumab, Pralatrexate, Romidepsin, 5-Azacitidine
Drug
Lead sponsor
University of Virginia
Other
Eligibility
18 Years and older
Enrollment
148 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 31, 2022 · Synced Oct 4, 2026, 4:14 AM EDT