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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Avitaminosis Clear all
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 Jul 23, 2026, 2:44 AM EDT
Completed Phase 2 Interventional

Vitamin D3 Supplementation for Heart Failure Patients

NCT01636570
View directory record Official record
Conditions
Heart Failure, Vitamin D Deficiency, Cardiomyopathy, Congestive Heart Failure
Interventions
Placebo Comparator: Sugar Pill, Vitamin D3 (cholecalciferol)
Drug
Lead sponsor
Heidi Moretti, MS, RD
Other
Eligibility
Not listed
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
2
States / cities
Missoula, Montana
Source: ClinicalTrials.gov public record
Updated Apr 25, 2017 · Synced Jul 23, 2026, 2:44 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 Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Clinical Approaches to Correcting Vitamin D Inadequacy and Maintaining Adequacy

NCT00692120
View directory record Official record
Conditions
Vitamin D Inadequacy, Vitamin D Deficiency
Interventions
Cholecalciferol (vitamin D3), Ergocalciferol (vitamin D2), Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
65 Years and older
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 4, 2015 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional

African American Children, Glycemic Control, and Type 2 Diabetes

NCT01325987
View directory record Official record
Conditions
Type 2 Diabetes, Vitamin D Deficiency
Interventions
Vitamin D2, Sugar pill
Dietary Supplement · Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
12 Years to 18 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jan 19, 2014 · Synced Jul 23, 2026, 2:44 AM EDT
Withdrawn Phase 3 Interventional

Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.

NCT02138591
View directory record Official record
Conditions
Vitamin d Deficiency
Interventions
Blood draw pre-operatively, Blood draw post-operative Day 1, Blood draw post-operative Day 2
Procedure
Lead sponsor
University of Missouri, Kansas City
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 15, 2017 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Phase 3 Interventional

Safety and Efficacy of 0.75% Phentolamine Ophthalmic Solution in Subjects With Post-refractive Surgery Visual Disturbances

NCT06349759
View directory record Official record
Conditions
Mesopic Vision, Night Vision Loss
Interventions
phentolamine ophthalmic solution 0.75%, a non-selective alpha-1 and alpha-2 adrenergic antagonist, Placebo
Drug
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
25
States / cities
Pheonix, Arizona • Scottsdale, Arizona • Bakersfield, California + 20 more
Source: ClinicalTrials.gov public record
Updated Mar 11, 2026 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional Results available

Vitamin D Repletion in Coronary Artery Disease

NCT01570309
View directory record Official record
Conditions
Vitamin D Deficiency, Coronary Artery Disease, Endothelial Dysfunction, Inflammation
Interventions
Ergocalciferol, Sugar pill
Drug · Other
Lead sponsor
Seth I. Sokol, M.D.
Other
Eligibility
18 Years and older
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
2
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Oct 9, 2013 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Phase 2 Interventional Results available

High Dose Intravenous Thiamine for the Prevention of Delirium in Allogeneic Hematopoietic Stem Cell Transplantation

NCT03263442
View directory record Official record
Conditions
Hematopoietic Stem Cell Transplantation, Delirium, Thiamine Deficiency
Interventions
Thiamine, Normal saline
Drug
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 18, 2021 · Synced Jul 23, 2026, 2:44 AM EDT
Terminated Not applicable Interventional

Hypovitaminosis D and an Inadequate PTH Response in Chronic Liver Disease Patients

NCT00599352
View directory record Official record
Conditions
Chronic Liver Disease, Hypovitaminosis
Interventions
magnesium
Dietary Supplement
Lead sponsor
Rajib Bhattacharya, MD
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated May 29, 2013 · Synced Jul 23, 2026, 2:44 AM EDT
Not listed Not applicable Interventional

The Nutritional Benefits of Metanx in Patients With Diabetic Peripheral Neuropathy (MEDIAN)

NCT01990092
View directory record Official record
Conditions
Diabetic Peripheral Neuropathy, B Vitamin Deficiency
Interventions
Metanx, Placebo
Other
Lead sponsor
Pamlab, Inc.
Industry
Eligibility
25 Years to 80 Years
Enrollment
238 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
25
States / cities
Mobile, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 21 more
Source: ClinicalTrials.gov public record
Updated Jan 17, 2016 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Metabolic Syndrome and Insulin Resistance at Allina

NCT01545830
View directory record Official record
Conditions
Metabolic Syndrome
Interventions
vitamin D3 (cholecalciferol)
Dietary Supplement
Lead sponsor
Allina Health System
Other
Eligibility
18 Years and older
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 31, 2016 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional Results available

Ultraviolet Light And Vitamin D In Subjects With Fat Malabsorption Or After Gastric Bypass Surgery

NCT01910792
View directory record Official record
Conditions
Vitamin D Deficiency, Gastrointestinal Diseases
Interventions
Sperti Lamp
Device
Lead sponsor
Boston University
Other
Eligibility
18 Years to 64 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 10, 2017 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional

Correlation Between Vitamin D Status and Bone Mineral Density in Patients With Hemophilia

NCT01090206
View directory record Official record
Conditions
Hemophilia A, Hemophilia B, Vitamin D Deficiency
Interventions
Vitamin D and calcium
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
2 Years to 21 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 28, 2016 · Synced Jul 23, 2026, 2:44 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 Jul 23, 2026, 2:44 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

The Variability of 25-hydroxyvitamin D Response From Crystalline 25-hydroxyvitamin D3

NCT01633658
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol, 25(OH)D
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
20 Years to 60 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated May 28, 2013 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Optimizing Vitamin D Nutrition in Healthy Adults

NCT00327847
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Oral Vitamin D Supplementation
Drug
Lead sponsor
Winthrop University Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2006
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Sep 24, 2008 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D Supplementation on Cardiometabolic Risk Factors [The Daily D Health Study]

NCT01537809
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
9 Years to 14 Years
Enrollment
691 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 12, 2013 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety, Efficacy, and Feasibility of High-dose Cholecalciferol in Pediatric Patients With Cystic Fibrosis

NCT02613884
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Treatment
Drug
Lead sponsor
Johns Hopkins All Children's Hospital
Other
Eligibility
36 Months to 18 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
St. Petersburg, Florida
Source: ClinicalTrials.gov public record
Updated Feb 2, 2021 · Synced Jul 23, 2026, 2:44 AM EDT
Not listed Not applicable Interventional

Vitamin D in Pediatric Asthma: a Randomized Controlled Open-label Pilot Trial

NCT02054975
View directory record Official record
Conditions
Asthma, Vitamin D Deficiency
Interventions
Vitamin D2 + vitamin D3, Vitamin D3
Drug
Lead sponsor
Nationwide Children's Hospital
Other
Eligibility
8 Years to 17 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 7, 2015 · Synced Jul 23, 2026, 2:44 AM EDT
Recruiting Not applicable Interventional

Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS)

NCT04355572
View directory record Official record
Conditions
Polycystic Ovarian Syndrome in Adolescent Females, Vitamin D Deficiency
Interventions
Vitamin D 4000IU daily, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
13 Years to 21 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 22, 2026 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Personalized Vitamin D Supplementation in European and African Americans

NCT02362269
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Female only
Enrollment
169 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
2
States / cities
Madison, Wisconsin • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 30, 2020 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Not applicable Interventional

Vitamin D Replacement Using Oral Thin Film (OTF) Cholecalciferol in Patients Undergoing Hematopoietic Stem Cell Transplantation

NCT04818957
View directory record Official record
Conditions
Vitamin D Deficiency, Hematopoietic Stem Cell Transplantation (HSCT)
Interventions
Oral Thin Film (OTF) Cholecalciferol (Vitamin D3)
Dietary Supplement
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
Not listed
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 1, 2023 · Synced Jul 23, 2026, 2:44 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Role of Vitamin D in Menopause: Relationship to Menopausal Symptoms in Body Composition

NCT01141972
View directory record Official record
Conditions
Hot Flushes, Menopause, Premature, Obesity, Vitamin D Deficiency
Interventions
Vitamin D, Placebo
Dietary Supplement · Other
Lead sponsor
Kaiser Permanente
Other
Eligibility
40 Years to 60 Years · Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 29, 2013 · Synced Jul 23, 2026, 2:44 AM EDT