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ClinicalTrials.gov public records Last synced Oct 3, 2026, 10:58 AM EDT

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Showing 25–40 of 40 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: No vitamin A supplementation Clear all
Withdrawn Phase 1Phase 2 Interventional Accepts healthy volunteers

Tocotrienols for Skeletal Muscle Health

NCT03708354
View directory record Official record
Conditions
Dynapenia, Postmenopausal Women
Interventions
placebo softgel, DeltaGold® Tocotrienol 70%
Drug
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
60 Years to 85 Years · Female only
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Feb 18, 2022 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Not applicable Interventional

The Effect of Vitamin D Supplementation on Glucose Metabolism in Non-Diabetic African American Adults

NCT01141192
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
vitamin D3, cholecalciferol, Inactive comparator
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
19 Years to 60 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 10, 2010 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Nicotinamide Riboside on Mitochondrial Function in Li-Fraumeni Syndrome

NCT03789175
View directory record Official record
Conditions
Cancer, Skin Fibroblasts, Muscle Weakness
Interventions
Nicotinamide Riboside (NR)
Dietary Supplement
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
18 Years to 70 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 8, 2020 · Synced Oct 3, 2026, 10:58 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Relationships Between Vitamin D and Orthopedic Trauma

NCT04564625
View directory record Official record
Conditions
Fracture, Fracture Nonunion, Fractures, Bone, Vitamin D
Interventions
Vitamin D Assessment, Fracture
Other
Lead sponsor
Methodist Health System
Other
Eligibility
18 Years to 25 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 19, 2026 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nutritional Outcomes After Vitamin A Supplementation in Subjects With SCD

NCT03632876
View directory record Official record
Conditions
Sickle Cell Anemia in Children, Vitamin A Deficiency in Children
Interventions
retinyl palmitate
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
9 Years and older
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 16, 2018 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Pilot Feasibility of Rice Bran Supplementation in Children

NCT02557373
View directory record Official record
Conditions
Dietary Rice Bran Supplementation
Interventions
Vitamin A, Rice Bran + Vitamin A
Dietary Supplement
Lead sponsor
Colorado State University
Other
Eligibility
4 Months to 10 Months
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 21, 2017 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Phase 2 Interventional Results available

A Phase II Study of Pemetrexed Plus Gemcitabine for Metastatic/Recurrent Head and Neck Cancer (HNSCC)

NCT00589667
View directory record Official record
Conditions
Head and Neck Cancer
Interventions
Pemetrexed plus Gemcitabine
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 2, 2014 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Not applicable Interventional Results available

The Effect of Hypovitaminosis D and Vitamin D Supplementation on Fracture Nonunion Rates

NCT01691833
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 14, 2022 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Phase 1 Interventional

Vitamin E Supplements in Preventing Cancer in Patients at Risk of Prostate Cancer or Who Have Prostate Cancer

NCT00895115
View directory record Official record
Conditions
Prostate Cancer
Interventions
vitamin E, sham intervention
Dietary Supplement · Procedure
Lead sponsor
University of Medicine and Dentistry of New Jersey
Other
Eligibility
18 Years and older · Male only
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 14, 2012 · Synced Oct 3, 2026, 10:58 AM EDT
Terminated Phase 3 Interventional Results available

Fixation Using Alternative Implants for the Treatment of Hip Fractures (FAITH-2)

NCT01908751
View directory record Official record
Conditions
Femoral Neck Fractures
Interventions
Sliding Hip Screw, Cancellous Screws, Vitamin D, Vitamin D Placebo
Procedure · Drug
Lead sponsor
McMaster University
Other
Eligibility
18 Years to 60 Years
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
10
States / cities
Phoenix, Arizona • San Francisco, California • Gainesville, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Nov 30, 2020 · Synced Oct 3, 2026, 10:58 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Nicotinamide Riboside, Vit B3 Analogue, and Brain Energy Metabolism

NCT07649161
View directory record Official record
Conditions
Healthy Adult
Interventions
Niagen®
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 17, 2026 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Not applicable Interventional

Fully Remote, Telehealth-based Ketogenic Metabolic Therapy for Long COVID

NCT07745699
View directory record Official record
Conditions
Long COVID Fatigue
Interventions
Ketogenic Metabolic Therapy, Lifestyle Intervention
Other · Behavioral
Lead sponsor
National University of Natural Medicine
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Absorbance Study - Clinical Trial of the Absorbance of Nano Liquid D3

NCT04885803
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Softgel Vitamin D3, Nano Liquid Vitamin D3, 25(OH)D Blood Serum Test, Placebo Control
Dietary Supplement · Diagnostic Test · Other
Lead sponsor
Inspired Life Medical, Inc.
Industry
Eligibility
18 Years to 70 Years
Enrollment
114 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Le Sueur, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 24, 2021 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Phase 2 Interventional Results available

Study of Pralatrexate With Vitamin B12 and Folic Acid Supplementation for Previously Treated Recurrent or Metastatic Head and Neck Squamous Cell Cancer (HNSCC)

NCT01183065
View directory record Official record
Conditions
Head and Neck Cancer
Interventions
Pralatrexate With Vitamin B12 and Folic Acid
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
5
States / cities
Basking Ridge, New Jersey • Commack, New York • New York, New York + 2 more
Source: ClinicalTrials.gov public record
Updated Nov 20, 2015 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Phase 1 Interventional

Vitamin E Supplements in Treating Patients Undergoing Surgery for Colorectal Cancer

NCT00905918
View directory record Official record
Conditions
Colorectal Cancer
Interventions
vitamin E, laboratory biomarker analysis
Dietary Supplement · Other
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Sep 30, 2014 · Synced Oct 3, 2026, 10:58 AM EDT
Completed Early Phase 1 Interventional

Vitamin D Supplementation on 15-Prostaglandin Dehydrogenase Expression in Barrett's Esophagus

NCT01465113
View directory record Official record
Conditions
Short Segment Barrett's Esophagus, Long Segment Barrett's Esophagus
Interventions
Omeprazole, Vitamin D3, upper endoscopy, Metformin
Drug · Procedure
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
3
States / cities
Beachwood, Ohio • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 10, 2016 · Synced Oct 3, 2026, 10:58 AM EDT