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Showing 1–24 of 180 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Vitamin D Supplementation Clear all
Not listed Not applicable Interventional

Vitamin D in Pediatric Asthma: a Randomized Controlled Open-label Pilot Trial

NCT02054975
View directory record Official record
Conditions
Asthma, Vitamin D Deficiency
Interventions
Vitamin D2 + vitamin D3, Vitamin D3
Drug
Lead sponsor
Nationwide Children's Hospital
Other
Eligibility
8 Years to 17 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 7, 2015 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional

Effectiveness of High Dose Vitamin D Supplementation in Stage III Colorectal Cancer

NCT02603757
View directory record Official record
Conditions
Colon Cancer, Rectal Cancer
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Legacy Health System
Other
Eligibility
18 Years to 99 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
3
States / cities
Gresham, Oregon • Portland, Oregon • Tualatin, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 30, 2020 · Synced Jun 26, 2026, 2:10 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 Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Efficacy of Vitamin D Supplementation in Bariatric Surgery Patients

NCT01385098
View directory record Official record
Conditions
Obesity, Vitamin D Deficiency
Interventions
Vitamin D3 and Calcium
Dietary Supplement
Lead sponsor
Vadim Sherman, MD
Other
Eligibility
18 Years to 65 Years · Female only
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 22, 2018 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Phase 3 Interventional Results available

Prevalence of Vitamin D Deficiency in Type 1 Diabetes Mellitus and Effect of Supplementation on Insulin Requirements

NCT01029392
View directory record Official record
Conditions
Type 1 Diabetes Mellitus
Interventions
Vitamin D
Drug
Lead sponsor
Corewell Health East
Other
Eligibility
1 Year to 18 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 16, 2017 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Calcium and Vitamin D Supplementation Decreases Incidence of Stress Fractures in Female Navy Recruits

NCT00476346
View directory record Official record
Conditions
Stress Fracture
Interventions
Calcium & Vitamin D
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
Female only
Enrollment
5,201 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2006
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Mar 24, 2015 · Synced Jun 26, 2026, 2:10 AM EDT
Terminated Not applicable Interventional

Vitamin D Supplementation in IBS

NCT03148288
View directory record Official record
Conditions
Irritable Bowel Syndrome, Vitamin D Deficiency, Abdominal Pain
Interventions
Vitamin D, placebo
Dietary Supplement
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 5, 2020 · Synced Jun 26, 2026, 2:10 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 Jun 26, 2026, 2:10 AM EDT
Terminated Phase 2 Interventional

Cholecalciferol in Treating Patients With Acute Myeloid Leukemia Undergoing Intensive Induction Chemotherapy

NCT01521936
View directory record Official record
Conditions
Adult Acute Megakaryoblastic Leukemia (M7), Adult Acute Monoblastic Leukemia (M5a), Adult Acute Monocytic Leukemia (M5b), Adult Acute Myeloblastic Leukemia With Maturation (M2), Adult Acute Myeloblastic Leukemia Without Maturation (M1), Adult Acute Myeloid Leukemia With 11q23 (MLL) Abnormalities, Adult Acute Myeloid Leukemia With Del(5q), Adult Acute Myeloid Leukemia With Inv(16)(p13;q22), Adult Acute Myeloid Leukemia With t(16;16)(p13;q22), Adult Acute Myeloid Leukemia With t(8;21)(q22;q22), Adult Acute Myelomonocytic Leukemia (M4), Adult Erythroleukemia (M6a), Adult Pure Erythroid Leukemia (M6b), Untreated Adult Acute Myeloid Leukemia
Interventions
cholecalciferol, pharmacological study, laboratory biomarker analysis
Dietary Supplement · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jun 18, 2015 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Randomized Trial: Maternal Vitamin D Supplementation to Prevent Childhood Asthma (VDAART)

NCT00920621
View directory record Official record
Conditions
Asthma
Interventions
Vitamin D 3 cholecalciferol, Vitamin D3
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 39 Years · Female only
Enrollment
876 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2023
U.S. locations
3
States / cities
San Diego, California • Boston, Massachusetts • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 11, 2026 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Phase 4 Interventional

Study of Vitamin D in the Severely Mentally Ill

NCT01169142
View directory record Official record
Conditions
Schizophrenia, Schizoaffective Disorder
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Bronx Psychiatric Center
Government
Eligibility
19 Years to 70 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Jul 18, 2018 · Synced Jun 26, 2026, 2:10 AM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

Effects of Vitamin D and Omega-3 Supplementation on Telomeres in VITAL

NCT04386577
View directory record Official record
Conditions
Aging
Interventions
Vitamin D3 (cholecalciferol), fish oil
Dietary Supplement · Drug
Lead sponsor
Augusta University
Other
Eligibility
50 Years and older
Enrollment
1,054 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated May 12, 2020 · Synced Jun 26, 2026, 2:10 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D and Omega-3 Adiposity Trial (VITAL Adiposity)

NCT01785004
View directory record Official record
Conditions
Adiposity
Interventions
Vitamin D3 (cholecalciferol), 2000 IU per day, omega-3 fatty acids (fish oil)
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 12, 2021 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D Supplementation During Pregnancy on Clinical Outcomes and Immune Function

NCT01417351
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU vitamin D3, 2,000 IU Vitamin D3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 45 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
2
States / cities
Davis, California • Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jul 22, 2013 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional

Vitamin D Supplementation in Glomerular Disease

NCT01835639
View directory record Official record
Conditions
Glomerular Disease
Interventions
Cholecalciferol, 2000 or 4000 IUs by mouth daily for 12 weeks
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
5 Years to 30 Years
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
5
States / cities
Wilmington, Delaware • Baltimore, Maryland • New Hyde Park, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 11, 2019 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional

Correction of Vitamin D Inadequacy in Nursing Home Residents

NCT00204906
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
vitamin D supplementation
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2005
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 4, 2015 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Phase 2 Interventional Results available

Study of Vitamin D and Effect on Heart Disease and Insulin Resistance

NCT01093417
View directory record Official record
Conditions
Human Immunodeficiency Virus (HIV), Vitamin D Deficiency, HIV Infections
Interventions
Vitamin D, Placebo
Drug · Other
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 13, 2016 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Phase 2 Interventional

Vitamin D3 Supplementation in Participants Diagnosed With Early-Stage Prostate Cancer Who Decide to Undergo Active Surveillance Treatment Regimen.

NCT01045109
View directory record Official record
Conditions
Prostate Cancer
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 90 Years · Male only
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 17, 2018 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin D Status of Pregnant Women and Their Children in Eau Claire, South Carolina

NCT00412087
View directory record Official record
Conditions
Vitamin D Deficiency, Pregnancy
Interventions
cholecalciferol (vitamin D3), cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
16 Years to 45 Years · Female only
Enrollment
564 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 28, 2016 · Synced Jun 26, 2026, 2:10 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 Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

DAYLIGHT: Vitamin D Therapy in Individuals at High Risk of Hypertension

NCT01240512
View directory record Official record
Conditions
Hypertension, Vitamin D Deficiency, Pre-Hypertension
Interventions
Cholecalciferol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 50 Years
Enrollment
534 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
3
States / cities
Hartford, Connecticut • Boston, Massachusetts • Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 8, 2017 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Calcium Supplementation for a Healthy Weight-Lite (CaSHeW Lite)

NCT00386672
View directory record Official record
Conditions
Obesity, Overweight
Interventions
Reduced energy (lite) OJ fortified with Calcium and Vitamin D, Nutrition Counseling, Reduced energy (lite) OJ without Calcium and Vitamin D
Dietary Supplement · Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
83 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Jun 26, 2026, 2:10 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D3 Supplementation for Low-Risk Prostate Cancer: A Randomized Trial

NCT01759771
View directory record Official record
Conditions
Prostate Cancer
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
19 Years to 90 Years · Male only
Enrollment
130 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2020
U.S. locations
2
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Mar 17, 2024 · Synced Jun 26, 2026, 2:10 AM EDT
Withdrawn Phase 4 Interventional

Sustained Effect of Urticaria Remission With Relatively High Dose Vitamin D Supplementation After Omalizumab Discontinuation

NCT02742805
View directory record Official record
Conditions
Urticaria
Interventions
Vitamin D (4,000 IU/day), Vitamin D (400 IU/day), Omalizumab
Dietary Supplement · Drug
Lead sponsor
Selina Gierer, D.O.
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Apr 30, 2018 · Synced Jun 26, 2026, 2:10 AM EDT