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Showing 1–24 of 962 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin D3 . Clear all
Active, not recruiting Not applicable Interventional

Cholecalciferol in Improving Survival in Patients With Newly Diagnosed Cancer With Vitamin D Insufficiency

NCT01787409
View directory record Official record
Conditions
Aggressive Non-Hodgkin Lymphoma, Anaplastic Large Cell Lymphoma, Angioimmunoblastic T-Cell Lymphoma, Chronic Lymphocytic Leukemia, Diffuse Large B-Cell Lymphoma, Enteropathy-Associated T-Cell Lymphoma, Hepatosplenic T-Cell Lymphoma, Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma, Mediastinal (Thymic) Large B-Cell Lymphoma, Nasal Type Extranodal NK/T-Cell Lymphoma, Peripheral T-Cell Lymphoma, Not Otherwise Specified, Primary Cutaneous Anaplastic Large Cell Lymphoma, Refractory Anaplastic Large Cell Lymphoma, Small Lymphocytic Lymphoma, Subcutaneous Panniculitis-Like T-Cell Lymphoma
Interventions
Cholecalciferol, Laboratory Biomarker Analysis
Dietary Supplement · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
565 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2028
U.S. locations
5
States / cities
Scottsdale, Arizona • Atlanta, Georgia • Iowa City, Iowa + 2 more
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effect of Caloric Restriction and Protein Intake on Metabolism and Anabolic Sensitivity

NCT02945410
View directory record Official record
Conditions
Weight Loss, Starvation
Interventions
Caloric Restriction, Protein, Exercise, Calcium and Vitamin D, Maltodextrin
Other · Dietary Supplement
Lead sponsor
University of Nebraska Lincoln
Other
Eligibility
19 Years to 30 Years · Male only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Dec 18, 2019 · Synced Sep 16, 2026, 9:38 AM EDT
Withdrawn Phase 3 Interventional

Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.

NCT02138591
View directory record Official record
Conditions
Vitamin d Deficiency
Interventions
Blood draw pre-operatively, Blood draw post-operative Day 1, Blood draw post-operative Day 2
Procedure
Lead sponsor
University of Missouri, Kansas City
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 15, 2017 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Phase 4 Interventional

A Randomized Phase IV Control Trial of Single High Dose Oral Vitamin D3 in Pediatric Patients Undergoing HSCT

NCT03176849
View directory record Official record
Conditions
Vitamin D Deficiency, Stem Cell Transplant Complications, Pediatric Cancer, Blood Disorder, Pediatric Acute Myeloid Leukemia, Pediatric Acute Lymphoid Leukemia, Myelodysplastic Syndromes, Sickle Cell Anemia in Children, Aplastic Anemia, Thalassemia in Children
Interventions
Vitamin D3, Standard Vitamin D3 Supplementation
Dietary Supplement
Lead sponsor
Phoenix Children's Hospital
Other
Eligibility
1 Year to 25 Years
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 16, 2020 · Synced Sep 16, 2026, 9:38 AM EDT
Active, not recruiting Not applicable Interventional

ViDES Trial (Vitamin D Extra Supplementation)

NCT05459298
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Placebo, 800 IU/day vitamin D supplementation with feedings in the first 28 days after birth, Usual Care
Dietary Supplement · Other
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
24 Hours to 96 Hours
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Sep 16, 2026, 9:38 AM EDT
Terminated Phase 3 Interventional Results available

Efficacy and Safety of Cinacalcet in Pediatric Patients With Secondary Hyperparathyroidism (SHPT) and Chronic Kidney Disease (CKD) on Dialysis

NCT02138838
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism
Interventions
Cinacalcet HCl, Standard of Care
Drug · Dietary Supplement
Lead sponsor
Amgen
Industry
Eligibility
6 Years to 17 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
26
States / cities
Los Angeles, California • Wilmington, Delaware • Atlanta, Georgia + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 28, 2020 · Synced Sep 16, 2026, 9:38 AM EDT
Withdrawn Phase 1 Interventional

A Pilot Study on the Effect of Vitamin D Treatment in Patients With Statin-Associated Myalgia

NCT01274104
View directory record Official record
Conditions
Hyperlipidemia
Interventions
Vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
18 Years to 88 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Apr 21, 2015 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Optimizing Vitamin D Status During Initial Military Training

NCT01617109
View directory record Official record
Conditions
Bone Health, Nutrition Status
Interventions
Ca/Vit D, Placebo
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 42 Years
Enrollment
342 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2018
U.S. locations
2
States / cities
Fort Sill, Oklahoma • San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Oct 10, 2018 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Phase 4 Interventional Results available

Vitamin D Plus Fluticasone Propionate

NCT01103934
View directory record Official record
Conditions
Seasonal Allergic Rhinitis
Interventions
Vitamin D3, Placebo, Fluticasone Propionate
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 45 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 8, 2014 · Synced Sep 16, 2026, 9:38 AM EDT
Recruiting No phase listed Observational

Correlation Vitamin D Level to Endocrine Autoimmune Toxicity Due to Immune Checkpoint Inhibitors

NCT04615988
View directory record Official record
Conditions
Thyroid, PD-1, Cancer
Interventions
blood draw and questionnaire completion, questionnaire completion, blood collection
Other
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2028
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 26, 2026 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D3 Supplementation Pilot Study

NCT01546103
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Cholecalciferol
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
12 Years to 17 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 22, 2013 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Phase 1 Interventional

Vitamin D Regulation of Gut Specific B Cells and Antibodies Targeting Gut Bacteria in Inflammatory Bowel Disease

NCT04828031
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Ulcerative Colitis, Crohn Disease
Interventions
Vitamin D
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Sep 20, 2023 · Synced Sep 16, 2026, 9:38 AM EDT
Terminated Not applicable Interventional

Cholecalciferol and Calcium Carbonate in Treating Patients With Colon Cancer That Has Been Removed by Surgery

NCT00470353
View directory record Official record
Conditions
Colorectal Cancer
Interventions
calcium carbonate, cholecalciferol, immunohistochemistry staining method, laboratory biomarker analysis, pharmacological study, biopsy
Dietary Supplement · Other · Procedure
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years to 120 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Aug 3, 2023 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Analysis of Response of Subjects With Atopic Dermatitis or Psoriasis to Oral Vitamin D3

NCT00789880
View directory record Official record
Conditions
Atopic Dermatitis, Psoriasis
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 70 Years
Enrollment
82 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
3
States / cities
San Diego, California • Denver, Colorado • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 11, 2017 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of a Once Daily Calcium and Vitamin D Fortified Food Product to Improve Bone Microarchitecture

NCT02375503
View directory record Official record
Conditions
Bone Alteration, Dietary Modification
Interventions
Calcium/Vitamin D, Placebo
Dietary Supplement
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 42 Years
Enrollment
175 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated May 14, 2017 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D3 Effects on Musculoskeletal Symptoms With Use of Aromatase Inhibitors

NCT01509079
View directory record Official record
Conditions
Muscle Pain, Joint Pain
Interventions
Vitamin D3
Drug
Lead sponsor
HealthPartners Institute
Other
Eligibility
18 Years and older · Female only
Enrollment
116 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 17, 2019 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Vitamin D Deficiency and Vitamin D Supplementation on Glucose Metabolism

NCT00749918
View directory record Official record
Conditions
Prediabetes, Vitamin D Deficiency
Interventions
Cholecalciferol (vitamin D3)
Dietary Supplement
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 65 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 19, 2008 · Synced Sep 16, 2026, 9:38 AM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Bone Mineral Density, Body Composition and Growth Following Severe Burn Injury

NCT00285090
View directory record Official record
Conditions
Burn, Growth, Malnutrition
Interventions
Calcium,Vitamin D, Calcium, VitaminD, Sugar Pill
Dietary Supplement · Other
Lead sponsor
Kathy Prelack, PhD, RD
Other
Eligibility
4 Years to 18 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 19, 2011 · Synced Sep 16, 2026, 9:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Resveratrol for the Prevention of Bone Loss in Postmenopausal Women

NCT06250283
View directory record Official record
Conditions
Low Bone Mass
Interventions
Resveratrol, Placebo
Dietary Supplement
Lead sponsor
University of Delaware
Other
Eligibility
Female only
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Newark, Delaware
Source: ClinicalTrials.gov public record
Updated May 12, 2026 · Synced Sep 16, 2026, 9:38 AM EDT
Terminated Phase 2 Interventional

Study of Docetaxel With Doxercalciferol or Placebo for Advanced Prostate Cancer

NCT00582582
View directory record Official record
Conditions
Prostate Cancer
Interventions
Docetaxel plus doxercalciferol, Docetaxel plus placebo
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years and older · Male only
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 12, 2019 · Synced Sep 16, 2026, 9:38 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 16, 2026, 9:38 AM EDT
Recruiting Not applicable Interventional

Maternal Stress on Human Milk and Infant Outcomes

NCT04821544
View directory record Official record
Conditions
Postpartum Depression, Preterm Labor
Interventions
Mindfulness-based intervention (with a focus on self-compassion; MBSC), Vitamin D
Behavioral · Dietary Supplement
Lead sponsor
University of Idaho
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Coeur d'Alene, Idaho
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Sep 16, 2026, 9:38 AM EDT
Withdrawn No phase listed Observational

Evaluation of Vitamin D Levels in Psoriasis Patients

NCT01903317
View directory record Official record
Conditions
Psoriasis
Interventions
Topical Therapy, Phototherapy and Systemic Therapy, Biologic Therapy
Other
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Irvine, California
Source: ClinicalTrials.gov public record
Updated May 7, 2024 · Synced Sep 16, 2026, 9:38 AM EDT
Terminated Phase 2 Interventional Results available

Oral Calcitriol With Ketoconazole in CRPC

NCT03261336
View directory record Official record
Conditions
Castration-resistant Prostate Cancer
Interventions
Calcitriol, Ketoconazole, Hydrocortisone
Drug
Lead sponsor
Donald Trump, MD
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Fairfax, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 7, 2021 · Synced Sep 16, 2026, 9:38 AM EDT