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Showing 25–41 of 17 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Calcifediol Clear all
Completed No phase listed Observational

Ergocalciferol in Chronic Kidney Disease

NCT00411294
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Not listed
Lead sponsor
Saint Louis VA Medical Center
Federal
Eligibility
18 Years to 80 Years
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 12, 2006 · Synced Sep 14, 2026, 7:38 AM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

The Influence of Proton Pump Inhibitors (PPI's) on Blood Levels of 25-Hydroxyvitamin D.

NCT01302704
View directory record Official record
Conditions
Vitamin D
Interventions
Not listed
Lead sponsor
Mike O'Callaghan Military Hospital
Federal
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Nellis Air Force Base, Nevada
Source: ClinicalTrials.gov public record
Updated Nov 24, 2013 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

25-Hydroxyvitamin D Pharmacokinetic Study

NCT03401541
View directory record Official record
Conditions
Vitamin D Deficiency, Fat Malabsorption
Interventions
Calcifediol, Calciferol
Drug
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 3, 2020 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Effect of a One Time Dose of Cholecalciferol on Serum Concentration of 25-Hydroxyvitamin D and Macrophages

NCT02920502
View directory record Official record
Conditions
Inflammation
Interventions
Arm 2: cholecalciferol 50,000 IU, Arm 3: cholecalciferol 100,000 IU, Arm 4: cholecalciferol 200,000 IU, Arm 1: Placebo
Dietary Supplement · Other
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 9, 2016 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Supplementation on Muscle Mass and Function

NCT01199926
View directory record Official record
Conditions
Obesity, Insulin Resistance, Inflammation
Interventions
Vitamin D, Placebo
Dietary Supplement · Drug
Lead sponsor
Purdue University
Other
Eligibility
18 Years to 35 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 14, 2015 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function

NCT02293187
View directory record Official record
Conditions
Vitamin D Deficiency, Sarcopenia
Interventions
vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Tufts University
Other
Eligibility
60 Years to 85 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 20, 2019 · Synced Sep 14, 2026, 7:38 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin D, Insulin Sensitivity, and Vascular Associations in Adolescents

NCT01041365
View directory record Official record
Conditions
Insulin Sensitivity, Flow-mediated Dilation, Arterial Stiffness
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
14 Years to 18 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2013
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jan 13, 2014 · Synced Sep 14, 2026, 7:38 AM EDT
Completed No phase listed Observational

Vitamin D3 Supplementation in Pediatric IBD: Weely vs Daily Dosing Regimens

NCT02256605
View directory record Official record
Conditions
Inflammatory Bowel Disease (IBD)
Interventions
Vitamin D-3
Dietary Supplement
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
5 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated May 28, 2015 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency

NCT01651000
View directory record Official record
Conditions
Chronic Kidney Disease, Hyperparathyroidism, Secondary, Vitamin D Deficiency
Interventions
CTAP101 30 μg capsules, Sugar pill to CTAP101 30 μg capsules
Drug · Other
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years and older
Enrollment
213 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Bannockburn, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 12, 2025 · Synced Sep 14, 2026, 7:38 AM EDT
Terminated Phase 4 Interventional

Sustainability of Vitamin D Levels After Repletion With Ergocalciferol In Chronic Kidney Disease Stage 5D

NCT01312441
View directory record Official record
Conditions
Vitamin D Deficiency, Renal Failure Chronic Requiring Hemodialysis
Interventions
Ergocalciferol, Placebo
Drug
Lead sponsor
Albany College of Pharmacy and Health Sciences
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
4
States / cities
Albany, New York • Clifton Park, New York • Saratoga Springs, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 13, 2016 · Synced Sep 14, 2026, 7:38 AM EDT
Terminated Phase 2 Interventional Results available

Safety, Efficacy, PK and PD of CTAP101 (Calcifediol) ER Capsules for SHPT in HD Patients VDI

NCT03602261
View directory record Official record
Conditions
Secondary Hyperparathyroidism Due to Renal Causes, Chronic Kidney Diseases, Vitamin D Deficiency, Stage 5 Chronic Kidney Disease
Interventions
Calcifediol Oral Capsule, Placebo oral capsule
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
18
States / cities
Peoria, Arizona • Phoenix, Arizona • Cypress, California + 13 more
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Solius UV Light Source in Improving Serum Levels of 25-hydroxyvitamin D

NCT04865432
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency
Interventions
UVB treatment
Device
Lead sponsor
Boston University
Other
Eligibility
22 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 22, 2022 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Not applicable Interventional

Vitamin D and Microbiota in Cystic Fibrosis

NCT02589444
View directory record Official record
Conditions
Vitamin D Deficiency, Cystic Fibrosis
Interventions
High-Dose Vitamin D3, Stool Sample, Sputum Sample, Sham Comparator, Blood draw
Dietary Supplement · Other · Procedure
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 13, 2017 · Synced Sep 14, 2026, 7:38 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin D Binding Protein (Gc) Allele Variation Effects Response to Vitamin D Treatment

NCT00650780
View directory record Official record
Conditions
Vitamin D Status
Interventions
Not listed
Lead sponsor
Creighton University
Other
Eligibility
19 Years to 90 Years
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Apr 1, 2008 · Synced Sep 14, 2026, 7:38 AM EDT
Active, not recruiting No phase listed Observational

Vitamin D and Immune Mechanisms of Hypertension in Type 2 Diabetics

NCT03348280
View directory record Official record
Conditions
Diabetes Mellitus, Type 2, Hypertension, Vitamin D Deficiency
Interventions
Blood draw
Diagnostic Test
Lead sponsor
Washington University School of Medicine
Other
Eligibility
25 Years to 80 Years
Enrollment
40 participants
Timeline
2017 – 2026
U.S. locations
2
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 23, 2025 · Synced Sep 14, 2026, 7:38 AM EDT
Completed Phase 2 Interventional Results available

Activated Vitamin D for the Prevention and Treatment of Acute Kidney Injury

NCT02962102
View directory record Official record
Conditions
Critically Ill, Acute Kidney Injury
Interventions
Calcifediol, Calcitriol, Placebos
Drug
Lead sponsor
David Leaf
Other
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 28, 2025 · Synced Sep 14, 2026, 7:38 AM EDT
Completed No phase listed Observational

Relationship Between Vitamin D Biomarkers and Survival in Blood Samples From Patients With Advanced Pancreatic Cancer

NCT01327794
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
polymorphism analysis, immunologic technique, laboratory biomarker analysis, medical chart review
Genetic · Other
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older
Enrollment
265 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Glens Falls, New York
Source: ClinicalTrials.gov public record
Updated Jun 28, 2016 · Synced Sep 14, 2026, 7:38 AM EDT