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Showing 1–24 of 58 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Low dose vitamin D3 Clear all
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 20, 2022 · Synced Sep 22, 2026, 6:41 PM EDT
Completed Phase 4 Interventional Results available

A Study That Will Compare the Effect of Two Drugs on Participants With Low Bone Mass and a Recent Hip Fracture

NCT00887354
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Risedronate, Placebo, Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
50 Years and older
Enrollment
224 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
6
States / cities
Fort Lauderdale, Florida • New Port Richey, Florida • Orlando, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 24, 2019 · Synced Sep 22, 2026, 6:41 PM 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 8, 2019 · Synced Sep 22, 2026, 6:41 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Cholecalciferol and Flu Vaccine in Treating Healthy Participants

NCT01561989
View directory record Official record
Conditions
Healthy, no Evidence of Disease
Interventions
cholecalciferol, questionnaire administration, trivalent influenza vaccine
Dietary Supplement · Other · Biological
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years to 64 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Mar 9, 2020 · Synced Sep 22, 2026, 6:41 PM 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 3, 2013 · Synced Sep 22, 2026, 6:41 PM EDT
Completed Phase 2 Interventional Results available

Optimal Vitamin D3 Supplementation Strategies for Acute Fracture Healing

NCT02786498
View directory record Official record
Conditions
Fracture
Interventions
Vitamin D3, Placebo
Drug · Other
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years to 50 Years
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 30, 2022 · Synced Sep 22, 2026, 6:41 PM 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 6, 2026 · Synced Sep 22, 2026, 6:41 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Vitamin D Status, Disease Specific and Quality of Life Outcomes in Patients With Cutaneous Lupus

NCT01498406
View directory record Official record
Conditions
Cutaneous Lupus Erythematosus
Interventions
vitamin D
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 19, 2013 · Synced Sep 22, 2026, 6:41 PM 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 12, 2014 · Synced Sep 22, 2026, 6:41 PM 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 16, 2017 · Synced Sep 22, 2026, 6:41 PM 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 Sep 22, 2026, 6:41 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Improving Functionality in Older People

NCT03611049
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
High dose Vitamin D3, Low dose Vitamin D3
Dietary Supplement
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
65 Years to 89 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Jul 22, 2019 · Synced Sep 22, 2026, 6:41 PM EDT
Recruiting Phase 2 Interventional

Impact of Vitamin D Therapy on Thyroid Function and Antibody Levels in Pediatric Graves' Disease

NCT07369063
View directory record Official record
Conditions
Graves Disease, Graves' Disease, Hyperthyroidism
Interventions
Ergocalciferol 50,000 IU, Methimazole
Drug
Lead sponsor
Northwell Health
Other
Eligibility
9 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
New Hyde Park, New York
Source: ClinicalTrials.gov public record
Updated Jan 26, 2026 · Synced Sep 22, 2026, 6:41 PM EDT
Terminated Phase 2 Interventional Results available

Can Vitamin D3 Improve Cognitive Function in Individuals With Type 2 Diabetes? (THINK-D)

NCT02416193
View directory record Official record
Conditions
Diabetes, Executive Dysfunction
Interventions
Cholecalciferol
Drug
Lead sponsor
Loyola University
Other
Eligibility
18 Years to 75 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 22, 2020 · Synced Sep 22, 2026, 6:41 PM 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 15, 2018 · Synced Sep 22, 2026, 6:41 PM EDT
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 24, 2022 · Synced Sep 22, 2026, 6:41 PM 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 3, 2018 · Synced Sep 22, 2026, 6:41 PM EDT
Completed Phase 4 Interventional Results available

Impact on Reducing the Incidence of Low Serum Calcium by Providing Educational Materials on the Need to Take Daily Supplemental Calcium and Vitamin D to Patients With Paget's Disease Treated With Reclast®

NCT00668200
View directory record Official record
Conditions
Paget's Disease of the Bone, Hypocalcemia
Interventions
Reclast (ZOL446, zoledronic acid), Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
Not listed
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
9
States / cities
Phoenix, Arizona • Tucson, Arizona • Gainesville, Georgia + 6 more
Source: ClinicalTrials.gov public record
Updated Mar 5, 2015 · Synced Sep 22, 2026, 6:41 PM EDT
Completed Not applicable Interventional Results available

The Role of Vitamin D in Chronic Urticaria and Angioedema Treatment

NCT01371877
View directory record Official record
Conditions
Urticaria, Angioedema, Hives, Swelling
Interventions
High Dose Vitamin D3, Low Dose Vitamin D3
Drug
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 20, 2023 · Synced Sep 22, 2026, 6:41 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Deficiency and Dysautonomia

NCT03032328
View directory record Official record
Conditions
Vitamin D Deficiency, Orthostatic Intolerance, Nausea
Interventions
vitamin D supplement
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
10 Years to 18 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2022
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 26, 2023 · Synced Sep 22, 2026, 6:41 PM EDT
Completed Phase 1 Interventional

Vitamin D Supplementation And Varicella Zoster Virus Vaccine Responsiveness In Older Long-Term Care Residents

NCT01262300
View directory record Official record
Conditions
Immunosenescence, Shingles
Interventions
Varicella Zoster Virus Vaccine (Zostavax)
Biological
Lead sponsor
University of Colorado, Denver
Other
Eligibility
60 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 24, 2021 · Synced Sep 22, 2026, 6:41 PM 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 22, 2026, 6:41 PM EDT
Active, not recruiting Phase 4 Interventional

Novel Precision Medicine Approach to Treatment of Osteoporosis Based on Bone Turnover

NCT05151484
View directory record Official record
Conditions
Age-Related Osteoporosis
Interventions
Teriparatide, Alendronate
Drug
Lead sponsor
Madhumathi Rao
Other
Eligibility
40 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 22, 2026, 6:41 PM 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 29, 2014 · Synced Sep 22, 2026, 6:41 PM EDT