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ClinicalTrials.gov public records Last synced Oct 6, 2026, 1:06 PM EDT

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Showing 25–48 of 69 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: 25-OH Vitamin D3 Clear all
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 29, 2016 · Synced Oct 6, 2026, 1:06 PM 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 29, 2015 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Not applicable Interventional Results available

Optimizing Vitamin D in the Elderly

NCT01554241
View directory record Official record
Conditions
Deficiency of Vitamin D3
Interventions
D3 2000 IU/day, D3 4000 IU/day, D3 50,000 IU weekly, vitamin D3 800 IU/day
Dietary Supplement
Lead sponsor
University of California, San Francisco
Other
Eligibility
65 Years and older
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Feb 18, 2015 · Synced Oct 6, 2026, 1:06 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 20, 2013 · Synced Oct 6, 2026, 1:06 PM EDT
Terminated Phase 2 Interventional Results available

Vitamin D3 Treatment in Pediatric Systemic Lupus Erythematosus

NCT01709474
View directory record Official record
Conditions
Systemic Lupus Erythematosus
Interventions
Vitamin D3 6000 IU, Vitamin D3 400 IU
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
5 Years to 20 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
13
States / cities
Los Angeles, California • Palo Alto, California • San Francisco, California + 9 more
Source: ClinicalTrials.gov public record
Updated Dec 17, 2015 · Synced Oct 6, 2026, 1:06 PM EDT
Not listed Phase 2 Interventional

Cholesterol and Antioxidant Treatment in Patients With Smith-Lemli-Opitz Syndrome (SLOS)

NCT01773278
View directory record Official record
Conditions
Smith-Lemli-Opitz Syndrome, Cone-Rod Dystrophy, Hearing Loss
Interventions
Antioxidants, Cholesterol
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
Up to 65 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2025
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated May 8, 2024 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Early Phase 1 Interventional

Effects of Vitamin D3 Versus 25OHD3 on Mineral Metabolism and Immune Function

NCT02091219
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D, 25(OH)D3
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 28, 2021 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation and Management of Metabolic Bone Disease in Kidney Transplant Recipients

NCT03958409
View directory record Official record
Conditions
Skeletal Anomalies, Kidney Transplant; Complications
Interventions
measurements to evaluate metabolic bone disease, standard care
Diagnostic Test
Lead sponsor
Yale University
Other
Eligibility
30 Years to 65 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 28, 2023 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

A Single Wintertime Dose of Vitamin D3 to Prevent Winter Decline in Vitamin D Status in Healthy Adults

NCT01924910
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
250,000 IU cholecalciferol as single, oral dose, Placebo
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 65 Years
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jul 13, 2017 · Synced Oct 6, 2026, 1:06 PM 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 29, 2013 · Synced Oct 6, 2026, 1:06 PM EDT
Not listed No phase listed Observational

Emulated Study of Vitamin D Correction Vs Non-Correction

NCT06366776
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
The Cooper Health System
Other
Eligibility
18 Years and older
Enrollment
9,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Camden, New Jersey
Source: ClinicalTrials.gov public record
Updated Jan 22, 2025 · Synced Oct 6, 2026, 1:06 PM EDT
Enrolling by invitation No phase listed Observational Accepts healthy volunteers

ALPCO 25(OH) Vitamin D CLIA Kit - Fresh Versus Frozen Serum and Plasma Stability Study

NCT07565064
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency, Healthy Volunteers
Interventions
ALPCO 25(OH) Vitamin D CLIA Kit
Device
Lead sponsor
American Laboratory Products Company
Industry
Eligibility
22 Years and older
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Salem, New Hampshire
Source: ClinicalTrials.gov public record
Updated May 4, 2026 · Synced Oct 6, 2026, 1:06 PM EDT
Not listed Phase 4 Interventional

How Bone is Made in Children Receiving Dialysis

NCT01799317
View directory record Official record
Conditions
Bone Mineralization Defect
Interventions
Vitamin D2
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
6 Years to 21 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
2
States / cities
Loma Linda, California • Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Feb 26, 2013 · Synced Oct 6, 2026, 1:06 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Serum, Dietary and Supplemental Vitamin D's Association With Cognitive Decline

NCT03320109
View directory record Official record
Conditions
Cognitive Decline, Cognitive Impairment
Interventions
Vitamin D
Other
Lead sponsor
National Institute on Aging (NIA)
NIH
Eligibility
30 Years to 64 Years
Enrollment
3,720 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2013
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 25, 2017 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Phase 1 Interventional

Vitamin D Regulation of Gut Specific B Cells and Antibodies Targeting Gut Bacteria in Inflammatory Bowel Disease

NCT04828031
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Ulcerative Colitis, Crohn Disease
Interventions
Vitamin D
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Sep 21, 2023 · Synced Oct 6, 2026, 1:06 PM 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 20, 2014 · Synced Oct 6, 2026, 1:06 PM EDT
Terminated Phase 2 Interventional

Cholecalciferol in Treating Patients With Acute Myeloid Leukemia Undergoing Intensive Induction Chemotherapy

NCT01521936
View directory record Official record
Conditions
Adult Acute Megakaryoblastic Leukemia (M7), Adult Acute Monoblastic Leukemia (M5a), Adult Acute Monocytic Leukemia (M5b), Adult Acute Myeloblastic Leukemia With Maturation (M2), Adult Acute Myeloblastic Leukemia Without Maturation (M1), Adult Acute Myeloid Leukemia With 11q23 (MLL) Abnormalities, Adult Acute Myeloid Leukemia With Del(5q), Adult Acute Myeloid Leukemia With Inv(16)(p13;q22), Adult Acute Myeloid Leukemia With t(16;16)(p13;q22), Adult Acute Myeloid Leukemia With t(8;21)(q22;q22), Adult Acute Myelomonocytic Leukemia (M4), Adult Erythroleukemia (M6a), Adult Pure Erythroid Leukemia (M6b), Untreated Adult Acute Myeloid Leukemia
Interventions
cholecalciferol, pharmacological study, laboratory biomarker analysis
Dietary Supplement · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jun 19, 2015 · Synced Oct 6, 2026, 1:06 PM 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 Dec 1, 2020 · Synced Oct 6, 2026, 1:06 PM EDT
Terminated Not applicable Interventional Results available

Vitamin D Supplementation Requirement in Obese Subjects

NCT00996866
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D3, placebo
Drug
Lead sponsor
Winthrop University Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Jul 3, 2023 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Not applicable Interventional

A Prospective Open-label Comparison of Two Vitamin D3 Repletion Strategies in Vitamin D Deficient Patients

NCT01650883
View directory record Official record
Conditions
Vitamin D 25 OH Deficiency
Interventions
Cholecalciferol, Cholecalciferol 5,000 IU
Dietary Supplement
Lead sponsor
University of South Florida
Other
Eligibility
18 Years and older
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Jul 26, 2012 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Not applicable Interventional

A Study of High-Dose Vit D Versus Standard of Care Vit D Supplementation

NCT05016310
View directory record Official record
Conditions
Breast, Breast Cancer, Osteoporosis
Interventions
High Dose Vitamin D, Standard of Care Vitamin D
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 23, 2025 · Synced Oct 6, 2026, 1:06 PM EDT
Terminated Early Phase 1 Interventional

Effects of Vitamin D on Renin Expression in Hypertensive Patients

NCT00585442
View directory record Official record
Conditions
Hypertension, Vitamin D Deficiency
Interventions
calcitriol, Placebo
Drug
Lead sponsor
University of Utah
Other
Eligibility
55 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 27, 2016 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Comparing a Novel Phototherapy Kiosk to Oral Vitamin D Supplementation

NCT04556136
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Standing Phototherapy Kiosk, D3 Oral supplement
Device · Dietary Supplement
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 69 Years
Enrollment
106 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Mar 13, 2024 · Synced Oct 6, 2026, 1:06 PM EDT
Completed Phase 1 Interventional Results available

Clearance of 25-hydroxyvitamin D in Chronic Kidney Disease

NCT02937350
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
D6-25-hydroxyvitamin D3
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
88 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 1, 2021 · Synced Oct 6, 2026, 1:06 PM EDT