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Showing 1–24 of 40 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: No vitamin A supplementation Clear all
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 1, 2014 · Synced Sep 28, 2026, 2:12 AM EDT
Withdrawn Phase 1 Interventional

Vitamin E Supplementation in Burn Patients

NCT01413620
View directory record Official record
Conditions
Burn Injury
Interventions
dl-alpha-tocopheryl acetate
Drug
Lead sponsor
Shriners Hospitals for Children
Other
Eligibility
6 Months to 85 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2021
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 20, 2021 · Synced Sep 28, 2026, 2:12 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 5, 2026 · Synced Sep 28, 2026, 2:12 AM EDT
Active, not recruiting Phase 1Phase 2 Interventional

Respiratory Outcomes After Early Vitamin D Supplementation in Infants Born Extremely Preterm

NCT05615311
View directory record Official record
Conditions
Prematurity; Extreme
Interventions
Vitamin D supplementation, No additional vitamin D supplementation
Dietary Supplement · Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
1 Day to 4 Days
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jun 14, 2026 · Synced Sep 28, 2026, 2:12 AM EDT
Completed Not applicable Interventional

Mindfulness-based Stress Reduction for Multiple Sclerosis

NCT02340754
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Mindfulness-based Stress Reduction, MS Education Control
Behavioral
Lead sponsor
National University of Natural Medicine
Other
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 8, 2018 · Synced Sep 28, 2026, 2:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effectiveness of Two Different Forms of Marine Oil on Indirect Markers of Muscle Damage and Soreness in Untrained Men

NCT03760757
View directory record Official record
Conditions
Inflammation; Muscle
Interventions
ESPO-572®, PCSO-524®
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 30 Years · Male only
Enrollment
57 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Bloomington, Indiana
Source: ClinicalTrials.gov public record
Updated Jul 27, 2020 · Synced Sep 28, 2026, 2:12 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D Intervention and Associated Changes in the Gut Microbiome and Vitamin D Levels in Healthy Adults

NCT05387876
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Vitamin D intervention, Placebo intervention
Dietary Supplement
Lead sponsor
Baylor University
Other
Eligibility
18 Years to 79 Years
Enrollment
43 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Waco, Texas
Source: ClinicalTrials.gov public record
Updated May 23, 2022 · Synced Sep 28, 2026, 2:12 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 13, 2022 · Synced Sep 28, 2026, 2:12 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 29, 2014 · Synced Sep 28, 2026, 2:12 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 29, 2020 · Synced Sep 28, 2026, 2:12 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 13, 2012 · Synced Sep 28, 2026, 2:12 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 20, 2017 · Synced Sep 28, 2026, 2:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Comparing a Novel Phototherapy Kiosk to Oral Vitamin D Supplementation

NCT04556136
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Standing Phototherapy Kiosk, D3 Oral supplement
Device · Dietary Supplement
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 69 Years
Enrollment
106 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Mar 12, 2024 · Synced Sep 28, 2026, 2:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Asthma and Obesity Diet Versus Exercise

NCT03644355
View directory record Official record
Conditions
Obesity, Childhood, Asthma in Children, Inflammatory Response, Metabolic Syndrome, Nutrition Poor, Physical Activity, Behavior, Eating, Molecular Biology, Restriction Fragment Length Polymorphisms, Maternal Exposure, Genetic Change
Interventions
Lifestyle counseling
Behavioral
Lead sponsor
Louisiana State University Health Sciences Center in New Orleans
Other
Eligibility
13 Years to 19 Years · Female only
Enrollment
110 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2016
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Aug 22, 2018 · Synced Sep 28, 2026, 2:12 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 7, 2020 · Synced Sep 28, 2026, 2:12 AM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Trial of Antibody Responses by Vitamin Supplementation

NCT03859687
View directory record Official record
Conditions
Healthy Participants
Interventions
Vitamin A supplementation, No vitamin A supplementation
Biological
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
1 Year to 4 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 4, 2025 · Synced Sep 28, 2026, 2:12 AM EDT
Not yet recruiting Phase 2 Interventional

Nicotinamide for Retinal Protection in Primary Open-Angle Glaucoma (NADIR Trial)

NCT07808333
View directory record Official record
Conditions
Glaucoma, Open-angle, Primary Open Angle Glaucoma (POAG)
Interventions
Nicotinamide, Standard Glaucoma Therapy
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
40 Years to 80 Years
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2029
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Sep 28, 2026, 2:12 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D and Prostate Cancer: A Clinical Study Enrolling Subjects Undergoing Prostatectomy

NCT02726113
View directory record Official record
Conditions
Prostate Cancer
Interventions
cholecalciferol, placebo
Drug · Other
Lead sponsor
Medical University of South Carolina
Other
Eligibility
19 Years to 90 Years · Male only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
2
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Dec 2, 2019 · Synced Sep 28, 2026, 2:12 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Prior Exposure to Conflicting Health Information on Responses to Subsequent Unrelated Health Messages

NCT04247529
View directory record Official record
Conditions
Communication Research
Interventions
Exposure to conflicting health information, No exposure to conflicting health information
Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
6,046 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 9, 2020 · Synced Sep 28, 2026, 2:12 AM EDT
Recruiting Phase 2 Interventional

Essential Amino Acid Supplementation for Femoral Fragility Fractures

NCT06050668
View directory record Official record
Conditions
Femoral Fracture, Fragility Fracture, Muscle Atrophy
Interventions
Essential Amino Acid Supplementation
Combination Product
Lead sponsor
Michael C Willey
Other
Eligibility
65 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
2
States / cities
Iowa City, Iowa • Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Sep 28, 2026, 2:12 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D as a Modifier of Serum Hepcidin in Children With Chronic Kidney Disease

NCT01532349
View directory record Official record
Conditions
Anemia of Chronic Kidney Disease
Interventions
Cholecalciferol
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
1 Year to 21 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 13, 2017 · Synced Sep 28, 2026, 2:12 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 23, 2021 · Synced Sep 28, 2026, 2:12 AM EDT
Not listed Not applicable Interventional

Effect of Vitamin D Status and Repletion on Postoperative Total Joint Arthroplasty Complications

NCT04229368
View directory record Official record
Conditions
Hip Arthropathy, Knee Arthropathy, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
900 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 15, 2023 · Synced Sep 28, 2026, 2:12 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 9, 2010 · Synced Sep 28, 2026, 2:12 AM EDT