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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Terminated Phase 1 Interventional

Effect of High-Dose Vitamin D3 in Smokers and Non-Smokers With and Without HIV

NCT03270709
View directory record Official record
Conditions
HIV/AIDS, Vitamin D Deficiency, Smoker Lung
Interventions
Vitamin D3 450,000 IU orally
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 20, 2021 · Synced Jun 11, 2026, 4:37 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 11, 2026, 4:37 AM 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 3, 2017 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Phase 2 Interventional Results available

Study of KRN23 (Burosumab), a Recombinant Fully Human Monoclonal Antibody Against Fibroblast Growth Factor 23 (FGF23), in Pediatric Subjects With X-linked Hypophosphatemia (XLH)

NCT02163577
View directory record Official record
Conditions
X-linked Hypophosphatemia
Interventions
burosumab
Biological
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
5 Years to 12 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
4
States / cities
San Francisco, California • New Haven, Connecticut • Indianapolis, Indiana + 1 more
Source: ClinicalTrials.gov public record
Updated May 5, 2024 · Synced Jun 11, 2026, 4:37 AM EDT
Not yet recruiting No phase listed Observational

Treatment Patterns, Biochemical Profiles and Clinical Outcomes in Adults With X-Linked Hypophosphatemia

NCT07607600
View directory record Official record
Conditions
X-linked Hypophosphatemia (XLH)
Interventions
No treatment given
Other
Lead sponsor
Novo Nordisk A/S
Industry
Eligibility
18 Years to 64 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
4
States / cities
New Haven, Connecticut • Indianapolis, Indiana • Columbus, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated May 25, 2026 · Synced Jun 11, 2026, 4:37 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 Jun 11, 2026, 4:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Different Vitamin D Preparations & FGF23 in Humans

NCT00957879
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Ergocalciferol, Calcitriol
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 45 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 18, 2012 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Phase 1 Interventional

Vitamin D Testing and Treatment for COVID 19

NCT04407286
View directory record Official record
Conditions
Covid 19, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Arizona State University
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Dec 29, 2021 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Replacement on Insulin Sensitivity

NCT01268111
View directory record Official record
Conditions
Insulin Sensitivity
Interventions
Ergocalciferols, Placebo
Drug
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
18 Years to 60 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Odessa, Texas
Source: ClinicalTrials.gov public record
Updated Jun 7, 2015 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Not applicable Interventional

A Study to Assess Metabolic Bone Disease of Prematurity Using an Acoustic Method

NCT04752098
View directory record Official record
Conditions
Metabolic Bone Disease, Osteopenia, Neonatal Rickets
Interventions
Vibro-acoustic analysis (VAA), based on ultrasound radiation force
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
3 Days to 8 Months
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 26, 2025 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Supplementation on Endothelial Function in Obese Adolescents

NCT01746264
View directory record Official record
Conditions
Obesity, Endothelial Dysfunction, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
12 Years to 18 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 1, 2016 · Synced Jun 11, 2026, 4:37 AM EDT
Not listed Not applicable Interventional

Vitamin K to Slow Progression of Cardiovascular Disease Risk in Hemodialysis Patients

NCT03311321
View directory record Official record
Conditions
Cardiovascular Diseases, Chronic Kidney Disease Stage 3, Chronic Kidney Disease Stage 4, Chronic Kidney Disease Stage 5, Vitamin K Deficiency, Hemodialysis
Interventions
Vitamin K2 (menaquinone-7; 360-mcg/d), Placebo-Control
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 19, 2019 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Phase 2Phase 3 Interventional

Vitamin D Supplementation for Extremely Preterm Infants

NCT01600430
View directory record Official record
Conditions
Vitamin D Deficiency, Preterm Infants, Bronchopulmonary Dysplasia
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
1 Minute to 7 Days
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Feb 9, 2017 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Not applicable Interventional Results available

Vitamin D in HIV-Infected Patients on HAART

NCT01250899
View directory record Official record
Conditions
Vitamin D Deficiency, HIV
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 90 Years
Enrollment
122 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 24, 2014 · Synced Jun 11, 2026, 4:37 AM EDT
Recruiting Phase 1Phase 2 Interventional

A First-in-human Study of KK8123 in Adults With X-linked Hypophosphatemia

NCT06525636
View directory record Official record
Conditions
X-linked Hypophosphatemia
Interventions
KK8123
Drug
Lead sponsor
Kyowa Kirin Co., Ltd.
Industry
Eligibility
18 Years to 65 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
5
States / cities
San Francisco, California • New Haven, Connecticut • Indianapolis, Indiana + 2 more
Source: ClinicalTrials.gov public record
Updated Nov 13, 2025 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Not applicable Interventional Results available

Impact of Vitamin B12 Replacement on Epogen Dosing and Improvement of Quality of Life in Hemodialysis Patients

NCT01876732
View directory record Official record
Conditions
Vitamin B12 Deficiency
Interventions
Vitamin B12
Drug
Lead sponsor
Northwell Health
Other
Eligibility
18 Years to 90 Years
Enrollment
132 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Staten Island, New York
Source: ClinicalTrials.gov public record
Updated Sep 7, 2014 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Vitamin D Increases Serum Levels of the Soluble Receptor for Advanced Glycation End Products in Women With PCOS

NCT03644212
View directory record Official record
Conditions
Polycystic Ovary Syndrome, Vitamin D Deficiency
Interventions
Vitamin D3
Drug
Lead sponsor
Maimonides Medical Center
Other
Eligibility
16 Years to 48 Years · Female only
Enrollment
79 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Brooklyn, New York
Source: ClinicalTrials.gov public record
Updated Jan 12, 2020 · Synced Jun 11, 2026, 4:37 AM EDT
Completed No phase listed Observational Results available

A Retrospective Study of the Natural History of Patients With Severe Perinatal and Infantile Hypophosphatasia (HPP)

NCT01419028
View directory record Official record
Conditions
Hypophosphatasia (HPP)
Interventions
Not listed
Lead sponsor
Alexion Pharmaceuticals, Inc.
Industry
Eligibility
Not listed
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
5
States / cities
Los Angeles, California • Indianapolis, Indiana • St Louis, Missouri + 2 more
Source: ClinicalTrials.gov public record
Updated Mar 31, 2019 · Synced Jun 11, 2026, 4:37 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Vitamin D Supplementation and Metabolism in Vitamin D Deficient Elderly

NCT01145703
View directory record Official record
Conditions
Vitamin D Deficiency, Metabolic Syndrome
Interventions
RDA Vitamin D3 only, Vitamin D2/3 Repletion only, Vitamin D2/3 Repletion + AEX, Vitamin D2/3 Repletion + RT
Dietary Supplement · Other
Lead sponsor
Baltimore VA Medical Center
Federal
Eligibility
40 Years to 85 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 4, 2014 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin B6 Dependence of One-Carbon Metabolism

NCT00877812
View directory record Official record
Conditions
Vitamin B6 Deficiency
Interventions
Arm 1 glycine and leucine, Arm 2 Intervention of Serine and methionine infusion
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
20 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 26, 2013 · Synced Jun 11, 2026, 4:37 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 20, 2014 · Synced Jun 11, 2026, 4:37 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Characterization of Hyperparathyroidism and Vitamin D Deficiency in Obesity

NCT00288873
View directory record Official record
Conditions
Vitamin D Deficiency, Secondary Hyperparathyroidism, Obesity
Interventions
Ergocalciferol, Cholecalciferol
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2007
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 19, 2018 · Synced Jun 11, 2026, 4:37 AM EDT
Enrolling by invitation No phase listed Observational

Vitamin A Status in Patients With Vocal Fold Leukoplakia

NCT05323292
View directory record Official record
Conditions
Vitamin A, Vitamin A Deficiency, Leukoplakia, Vocal Cord Neoplasm
Interventions
Not listed
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years and older
Enrollment
90 participants
Timeline
2022 – 2026
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 16, 2025 · Synced Jun 11, 2026, 4:37 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 20, 2022 · Synced Jun 11, 2026, 4:37 AM EDT