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ClinicalTrials.gov public records Last synced Oct 9, 2026, 5:28 PM EDT

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Showing 49–72 of 84 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: 400 IU vitamin D3 Clear all
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 9, 2026, 5:28 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Effect Of Vitamin D On Measures Of Bone Health And Gene Expression

NCT01696409
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU vitamin D3, 2000 IU vitamin D3
Dietary Supplement
Lead sponsor
Boston University
Other
Eligibility
18 Years to 70 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 4, 2017 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 3 Interventional

TOP: Recombinant Human Parathyroid Hormone (ALX1-11) on Fracture Incidence in Women With Postmenopausal Osteoporosis

NCT00172081
View directory record Official record
Conditions
Osteoporosis
Interventions
placebo, ALX1-11
Drug
Lead sponsor
Shire
Industry
Eligibility
45 Years and older · Female only
Enrollment
2,532 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2003
U.S. locations
107
States / cities
Birmingham, Alabama • Huntsville, Alabama • Phoenix, Arizona + 95 more
Source: ClinicalTrials.gov public record
Updated May 14, 2021 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 4 Interventional Results available

Wheezing in Black Preterm Infants: Impact of Vitamin D Supplementation Strategy

NCT01601847
View directory record Official record
Conditions
Wheezing, Allergy
Interventions
Cholecalciferol, Cholecalciferol
Dietary Supplement · Drug
Lead sponsor
Case Western Reserve University
Other
Eligibility
Up to 1 Year
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
5
States / cities
New York, New York • Cleveland, Ohio • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 8, 2018 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 4 Interventional

Vitamin D Deficiency in Adults Following a Major Burn Injury

NCT05084248
View directory record Official record
Conditions
Vitamin D Deficiency, Burns
Interventions
Ergocalciferol Capsules
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 15, 2025 · Synced Oct 9, 2026, 5:28 PM EDT
Terminated No phase listed Observational

Effect of Vitamin D Supplementation on In-vitro Fertilization (IVF) Outcomes

NCT01419743
View directory record Official record
Conditions
Infertility, Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 38 Years · Female only
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
3
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 19, 2014 · Synced Oct 9, 2026, 5:28 PM EDT
Active, not recruiting Not applicable Interventional

Randomized Trial of Enteral Vitamin D Supplementation in Infants < 28 Weeks Gestational Age or <1000 Grams Birth Weight

NCT05694689
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
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Oct 9, 2026, 5:28 PM 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 9, 2017 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 3 Interventional Results available

A Study of Actonel for the Prevention of Bone Loss

NCT00452439
View directory record Official record
Conditions
Leukemia, Lymphoma
Interventions
Actonel (Risedronate), Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2014
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 28, 2020 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 2 Interventional Results available

Exemestane and Celecoxib in Postmenopausal Women at High Risk for Breast Cancer

NCT00073073
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Exemestane, Calcium carbonate, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Georgetown University
Other
Eligibility
Female only
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2011
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated May 17, 2016 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19

NCT04868903
View directory record Official record
Conditions
SARS-CoV-2 Infection
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
1,475 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 22, 2026 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety of Vitamin D Supplementation in Older Persons

NCT00681590
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol (vitamin D)
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
65 Years to 95 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 26, 2017 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Changes in Breast Cancer Biomarkers Using Synergistic Prostaglandin Inhibitors

NCT01425476
View directory record Official record
Conditions
Breast Cancer
Interventions
Celecoxib, Placebo, Cholecalciferol
Drug
Lead sponsor
Hartford Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2016
U.S. locations
1
States / cities
Grand Forks, North Dakota
Source: ClinicalTrials.gov public record
Updated Aug 9, 2017 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Early Phase 1 Interventional

High Dose Vit D Musculoskeletal Symptoms & Bone Density in Anastrozole-Treated Breast Cancer With Marginal Vit D Status

NCT00263185
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Vitamin D, Calcium carbonate, Vitamin D, Placebo
Dietary Supplement · Drug · Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Sep 22, 2014 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of Vitamin D Supplementation and Immune Function

NCT01399151
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D - Treatment 1, Vitamin D - Treatment 2, Vitamin D - Treatment 3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 49 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 22, 2014 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 3 Interventional Results available

Zoledronate, Vitamin D, and Calcium With or Without Strontium 89 or Samarium 153 in Preventing or Delaying Bone Problems in Patients With Bone Metastases From Prostate Cancer, Lung Cancer, or Breast Cancer

NCT00365105
View directory record Official record
Conditions
Breast Cancer, Lung Cancer, Metastatic Cancer, Pain, Prostate Cancer
Interventions
Calcium, Vitamin D, zoledronic acid, Sm-153, Sr-89
Dietary Supplement · Drug · Radiation
Lead sponsor
Radiation Therapy Oncology Group
Network
Eligibility
18 Years and older
Enrollment
261 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2017
U.S. locations
147
States / cities
Mobile, Alabama • Burbank, California • Carmichael, California + 116 more
Source: ClinicalTrials.gov public record
Updated Sep 20, 2024 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Not applicable Interventional

Prevention of Osteoporosis in Breast Cancer Survivors

NCT00567606
View directory record Official record
Conditions
Postmenopausal Osteoporosis
Interventions
Strength/Weight Training & Drug/Supplement, Drug/Supplement only
Other · Combination Product
Lead sponsor
University of Nebraska
Other
Eligibility
35 Years to 75 Years · Female only
Enrollment
249 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
4
States / cities
Kearney, Nebraska • Lincoln, Nebraska • Omaha, Nebraska + 1 more
Source: ClinicalTrials.gov public record
Updated Nov 30, 2023 · Synced Oct 9, 2026, 5:28 PM EDT
Terminated Phase 2 Interventional Results available

Vitamin D and Breast Cancer: Does Weight Make a Difference?

NCT01472445
View directory record Official record
Conditions
Breast Cancer
Interventions
Vitamin D
Drug
Lead sponsor
Melinda Telli
Other
Eligibility
18 Years and older · Female only
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Apr 23, 2026 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Phase 2 Interventional Results available

Study of Vitamin D in Untreated Metastatic Colorectal Cancer

NCT01516216
View directory record Official record
Conditions
Metastatic Colorectal Cancer
Interventions
FOLFOX + bevacizumab, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2019
U.S. locations
18
States / cities
Boise, Idaho • Fruitland, Idaho • Meridian, Idaho + 13 more
Source: ClinicalTrials.gov public record
Updated Apr 26, 2022 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Consumption of Post-harvest UV-B Treated Mushrooms on Vitamin D Status of Healthy Adults

NCT01443897
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
1,000 IU vitamin D2, placebo capsule, mushrooms, UVB-treated mushrooms, 400 IU vitamin D2, UVB-treated mushrooms, 1,000 IU vitamin D2
Dietary Supplement · Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 59 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Sep 30, 2011 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Not applicable Interventional

Serum 25-hydroxy Vitamin D [25(OH)D] Levels, Supplemental Vitamin D, and Parathyroid Hormone Levels in Premature Infants

NCT01469650
View directory record Official record
Conditions
Premature Infants
Interventions
cholecalciferal, cholecalciferol
Dietary Supplement
Lead sponsor
University of Nebraska
Other
Eligibility
23 Weeks to 32 Weeks
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 6, 2023 · Synced Oct 9, 2026, 5:28 PM EDT
Terminated Not applicable Interventional Results available

Vitamin D Deficiency and Atopic Dermatitis

NCT01337635
View directory record Official record
Conditions
Atopic Dermatitis, Vitamin D Deficiency
Interventions
Vitamin D
Drug
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
1 Year to 18 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 5, 2018 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Not applicable Interventional Results available

Improving Vitamin D Status in Home-bound Elders

NCT01410084
View directory record Official record
Conditions
Vitamin D Deficiency, Accidental Falls
Interventions
Vitamin D3, Vitamin E
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
65 Years and older
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 9, 2019 · Synced Oct 9, 2026, 5:28 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Status and Dose Response in Infants

NCT01042561
View directory record Official record
Conditions
Vitamin D, Prematurity
Interventions
Vitamin D3, vitamin D3 placebo
Dietary Supplement
Lead sponsor
University of Nebraska
Other
Eligibility
5 Minutes to 3 Months
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 1, 2023 · Synced Oct 9, 2026, 5:28 PM EDT