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ClinicalTrials.gov public records Last synced Sep 30, 2026, 5:18 AM EDT

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Showing 25–48 of 58 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Low dose Vitamin D3 Clear all
Terminated Phase 2 Interventional

Vitamin D Supplementation for Adults With Neurofibromatosis Type 1 (NF1)

NCT01968590
View directory record Official record
Conditions
Neurofibromatosis Type 1 (NF1)
Interventions
Cholecalciferol
Drug
Lead sponsor
University of Utah
Other
Eligibility
25 Years to 40 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
2
States / cities
Cincinnati, Ohio • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 25, 2022 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 2 Interventional Results available

Correction of Vitamin D Levels and Its Effect on Insulin Resistance and Weight Gain in Obese Youth

NCT02168660
View directory record Official record
Conditions
Obesity, Insulin Resistance, Vitamin D Deficiency
Interventions
Vitamin D3
Drug
Lead sponsor
Perrin C White, MD
Other
Eligibility
6 Years to 17 Years
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 9, 2019 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of a Meal on Vitamin D Absorption

NCT01268176
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
50 Years to 69 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 13, 2013 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 2 Interventional Results available

Development of Vitamin D as a Therapy for Breast Cancer - Phase 2

NCT00656019
View directory record Official record
Conditions
Breast Cancer
Interventions
Vitamin D
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older · Female only
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Dec 2, 2017 · Synced Sep 30, 2026, 5:18 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 4, 2023 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Not applicable Interventional Results available

Vitamin D Supplements for HIV-positive Patients on cART

NCT01295034
View directory record Official record
Conditions
HIV-associated Co-morbidities
Interventions
conventional vitamin D treatment, tiered/titrated vitamin D dosing
Dietary Supplement · Drug
Lead sponsor
Andrea Branch
Other
Eligibility
18 Years to 70 Years
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 17, 2017 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 4 Interventional Results available

Evaluation of the Effectiveness of Paricalcitol Versus Cinacalcet With Low-Dose Vitamin D

NCT00977080
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism, Hemodialysis
Interventions
Paricalcitol, Cinacalcet
Drug
Lead sponsor
Abbott
Industry
Eligibility
18 Years and older
Enrollment
272 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
30
States / cities
Tempe, Arizona • Chula Vista, California • Los Angeles, California + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 20, 2012 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Not applicable Interventional Results available

Cholecalciferol in Newly Diagnosed Non-Hodgkin Lymphoma or Chronic Lymphocytic Leukemia With Vitamin D Deficiency

NCT02553447
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia, Non-Hodgkin Lymphoma, Untreated Chronic Lymphocytic Leukemia, Vitamin D Deficiency
Interventions
Cholecalciferol, Laboratory Biomarker Analysis
Dietary Supplement · Other
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
197 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2025
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Apr 21, 2026 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 1 Interventional

Pharmacokinetics and Safety Pilot Study of Single-Dose Oral and Intravenous CTAP101 in Stage 3 and 4 Chronic Kidney Disease Subjects

NCT00888069
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions
CTAP101 Capsules, CTAP101 Injection
Drug
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
12
States / cities
Peoria, Arizona • Evergreen Park, Illinois • Springfield, Massachusetts + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 30, 2014 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Treatment Study of Vitamin D Deficiency in Adolescents

NCT01784029
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D3
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
13 Years to 20 Years
Enrollment
183 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Oct 16, 2018 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Can Vitamin D Reduce the Burden of COVID-19?

NCT07128069
View directory record Official record
Conditions
COVID-19
Interventions
Vitamin D 400IU, Vitamin D 4000IU
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
2,093 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 7, 2026 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption

NCT01508845
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
50 Years and older
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 21, 2014 · Synced Sep 30, 2026, 5:18 AM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

One Week Comparison Study of PTH and PTHrP Infusions

NCT01333267
View directory record Official record
Conditions
Osteoporosis, Hypercalcemia of Malignancy, Hyperparathyroidism, Bone Diseases, Endocrine
Interventions
Parathyroid Hormone-related Protein (1-36), parathyroid hormone (1-34), PTH (1-34) and PTHrP (1-36)
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
24 Years to 35 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 5, 2014 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Vitamin D Supplementation in Healthy Adolescents

NCT01126671
View directory record Official record
Conditions
Vitamin D Supplementation
Interventions
Supplemental Vitamin D
Drug
Lead sponsor
Boston Children's Hospital
Other
Eligibility
11 Years to 18 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 4, 2018 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Tumor Necrosis Factor Decreases Vitamin D Dependant Calcium Absorption

NCT00427804
View directory record Official record
Conditions
Rheumatoid Arthritis, Crohn's Disease
Interventions
calcitriol
Drug
Lead sponsor
Atlanta VA Medical Center
Federal
Eligibility
18 Years to 50 Years · Male only
Enrollment
9 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Feb 4, 2013 · Synced Sep 30, 2026, 5:18 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 9, 2017 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 2 Interventional

The Investigation of Vitamin D and Menstrual Cycles Trial, the inVitD Trial: A Phase II Clinical Trial

NCT05050916
View directory record Official record
Conditions
Reproductive Issues
Interventions
Vitamin D, Placebo
Dietary Supplement · Other
Lead sponsor
National Institute of Environmental Health Sciences (NIEHS)
NIH
Eligibility
19 Years to 40 Years · Female only
Enrollment
998 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
2
States / cities
Detroit, Michigan • Research Triangle Park, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 11, 2026 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Vitamin D and Arterial Stiffness in Elderly

NCT03649802
View directory record Official record
Conditions
Vitamin D Deficiency, Arterial Stiffness
Interventions
Low dose vitamin D3, High dose vitamin D3
Dietary Supplement
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
65 Years to 89 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Mar 21, 2022 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 2 Interventional Results available

Phase 2 Safety and Efficacy Study of a Vitamin D Compound (DP001) in Postmenopausal Women With Low Bone Mineral Density

NCT00715676
View directory record Official record
Conditions
Osteoporosis
Interventions
Placebo, DP001
Drug
Lead sponsor
Deltanoid Pharmaceuticals
Industry
Eligibility
55 Years to 80 Years · Female only
Enrollment
157 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
9
States / cities
Upland, California • Indianapolis, Indiana • Bethesda, Maryland + 6 more
Source: ClinicalTrials.gov public record
Updated Jan 11, 2010 · Synced Sep 30, 2026, 5:18 AM EDT
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 Sep 30, 2026, 5:18 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 16, 2023 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D3 Supplementation on Insulin Resistance and Cardiovascular Risk Factors in Obese Adolescents

NCT00858247
View directory record Official record
Conditions
Obesity
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
12 Years to 18 Years
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 20, 2014 · Synced Sep 30, 2026, 5:18 AM EDT
Completed Phase 3 Interventional Results available

Study of the Effect of Vitamin D as an Add-on Therapy to Corticosteroids in Asthma

NCT01248065
View directory record Official record
Conditions
Asthma
Interventions
Vitamin D3, Ciclesonide
Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
18 Years and older
Enrollment
408 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
16
States / cities
San Francisco, California • Denver, Colorado • Atlanta, Georgia + 10 more
Source: ClinicalTrials.gov public record
Updated Aug 13, 2014 · Synced Sep 30, 2026, 5:18 AM EDT
Active, not recruiting Phase 2 Interventional

DePTH: De-emphasize PTH

NCT06288451
View directory record Official record
Conditions
Kidney Failure, Chronic, Chronic Kidney Disease-Mineral and Bone Disorder
Interventions
Oral calcitriol with cinacalcet rescue, IV activated vitamin D
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 2, 2025 · Synced Sep 30, 2026, 5:18 AM EDT