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Showing 1–24 of 1,030 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: vitamin d Clear all
Withdrawn Not applicable Interventional Accepts healthy volunteers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 Sep 12, 2026, 1:46 PM EDT
Active, not recruiting Phase 4 Interventional

Romosozumab Use to Build Skeletal Integrity

NCT05058976
View directory record Official record
Conditions
Osteoporosis, Osteoporosis, Postmenopausal, Osteoporosis Fracture
Interventions
Romosozumab, Placebo, Zoledronic acid, Calcium and Vitamin D
Drug · Dietary Supplement
Lead sponsor
Susan L. Greenspan
Other
Eligibility
65 Years and older · Female only
Enrollment
184 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 16, 2026 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Phase 4 Interventional Results available

Novel Combination Therapy for Osteoporosis in Men

NCT03994172
View directory record Official record
Conditions
Male Osteoporosis
Interventions
Teriparatide or human parathyroid hormone (PTH) 1-34, Cinacalcet, placebo tablet, Calcium citrate tablet, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
60 Years to 85 Years · Male only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Sep 12, 2026, 1:46 PM EDT
Terminated Phase 1 Interventional

Topical Calcipotriene Treatment for Breast Cancer Immunoprevention

NCT03596073
View directory record Official record
Conditions
Breast Cancer
Interventions
Topical Calcipotriene Ointment, Topical Vaseline
Drug · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
50 Years and older
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 6, 2025 · Synced Sep 12, 2026, 1:46 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 2, 2023 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional

High-dose Vitamin D Supplementation for ADT-induced Side Effects

NCT02064946
View directory record Official record
Conditions
Prostatic Neoplasms, Bone Mineral Density Quantitative Trait Locus 3
Interventions
vitamin D, Placebo
Dietary Supplement
Lead sponsor
University of Rochester
Other
Eligibility
60 Years to 99 Years · Male only
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Apr 7, 2019 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional

Effect of Vitamin D Supplementation on Hemoglobin A1c in Patients With Uncontrolled Type 2 Diabetes Mellitus

NCT00985361
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
Vitamin D3 2000 international units daily, Vitamin C 500mg daily
Dietary Supplement
Lead sponsor
ProMedica Health System
Other
Eligibility
21 Years to 75 Years
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
3
States / cities
Sylvania, Ohio • Toledo, Ohio
Source: ClinicalTrials.gov public record
Updated May 5, 2010 · Synced Sep 12, 2026, 1:46 PM EDT
Active, not recruiting Not applicable Interventional

Cholecalciferol in Improving Survival in Patients With Newly Diagnosed Cancer With Vitamin D Insufficiency

NCT01787409
View directory record Official record
Conditions
Aggressive Non-Hodgkin Lymphoma, Anaplastic Large Cell Lymphoma, Angioimmunoblastic T-Cell Lymphoma, Chronic Lymphocytic Leukemia, Diffuse Large B-Cell Lymphoma, Enteropathy-Associated T-Cell Lymphoma, Hepatosplenic T-Cell Lymphoma, Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma, Mediastinal (Thymic) Large B-Cell Lymphoma, Nasal Type Extranodal NK/T-Cell Lymphoma, Peripheral T-Cell Lymphoma, Not Otherwise Specified, Primary Cutaneous Anaplastic Large Cell Lymphoma, Refractory Anaplastic Large Cell Lymphoma, Small Lymphocytic Lymphoma, Subcutaneous Panniculitis-Like T-Cell Lymphoma
Interventions
Cholecalciferol, Laboratory Biomarker Analysis
Dietary Supplement · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
565 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2028
U.S. locations
5
States / cities
Scottsdale, Arizona • Atlanta, Georgia • Iowa City, Iowa + 2 more
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Sep 12, 2026, 1:46 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Study of Parental Ratings of Quality of Life and Body Composition in 5-19 Year Olds While Participating in the Good NEWS 4 Kids Program

NCT01855009
View directory record Official record
Conditions
Quality of Life, Body Mass Index
Interventions
MannaBears, AlgaeCal Calcium, Calcium carbonate, Vitamin D3
Dietary Supplement
Lead sponsor
Integrative Health Technologies, Inc.
Network
Eligibility
5 Years to 19 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jun 23, 2013 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D-Enriched Mushrooms on Vitamin D Status and Immune Function and Inflammatory Status in Adults

NCT05559112
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D-enriched mushrooms, Study Powder
Other
Lead sponsor
Purdue University
Other
Eligibility
30 Years to 69 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Jul 9, 2024 · Synced Sep 12, 2026, 1:46 PM EDT
Suspended Not applicable Interventional

Adjunctive Treatment With Vitamin D3 in Patients With Active IBD

NCT04225819
View directory record Official record
Conditions
IBD, Inflammatory Bowel Diseases, Crohn Disease, Ulcerative Colitis, Vitamin D3 Deficiency
Interventions
Vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2029
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 26, 2026 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Vitamin D Supplementation in Breastfeeding Women

NCT01240265
View directory record Official record
Conditions
Vitamin D Deficiency, Rickets, Infant Nutrition Disorders
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
1 Month to 50 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 29, 2013 · Synced Sep 12, 2026, 1:46 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D and Omega-3 Fatty Acids on Infectious Diseases and hCAP18 (VITAL Infection)

NCT01758081
View directory record Official record
Conditions
Infections, Human Cathelicidin Antimicrobial Peptide (hCAP-18)
Interventions
vitamin D3, omega-3 fatty acids (fish oil), Vitamin D3 placebo, fish oil placebo
Dietary Supplement · Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,874 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 24, 2025 · Synced Sep 12, 2026, 1:46 PM EDT
Recruiting No phase listed Observational

High Dose Interval Vitamin D Supplementation in Patients With Inflammatory Bowel Disease Receiving Biologic Therapy

NCT04331639
View directory record Official record
Conditions
Inflammatory Bowel Disease, Crohn Disease, Ulcerative Colitis, Vitamin D Deficiency
Interventions
vitamin D3
Dietary Supplement
Lead sponsor
Boston Children's Hospital
Other
Eligibility
5 Years to 25 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 2, 2025 · Synced Sep 12, 2026, 1:46 PM EDT
Withdrawn Not applicable Interventional

Vitamin D Repletion and Maintenance in IBD: How Much and How Often

NCT03053414
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Vitamin D Deficiency
Interventions
Vitamin D (ergocalciferol and/ or cholecalciferol)
Dietary Supplement
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 20, 2018 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional

Efficacy of Vitamin D Supplementation in Obese Children

NCT02956408
View directory record Official record
Conditions
Obesity, Pediatric, Obesity, Childhood, Obesity, Morbid, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
5 Years to 11 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Sep 12, 2026, 1:46 PM EDT
Terminated Phase 1 Interventional

Doxercalciferol in Recurrent Pediatric Solid Tumors

NCT00511017
View directory record Official record
Conditions
Solid Tumors
Interventions
Doxercalciferol
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
2 Years to 26 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 30, 2012 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Phase 1 Interventional

Calcitriol and Gefitinib With or Without Dexamethasone in Treating Patients With Advanced Solid Tumors

NCT00084708
View directory record Official record
Conditions
Unspecified Adult Solid Tumor, Protocol Specific
Interventions
calcitriol, dexamethasone, gefitinib
Dietary Supplement · Drug
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
53 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jan 12, 2014 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Early Phase 1 Interventional

A Pilot Study to Examine the Effects of Vitamin D Supplementation on Mitochondrial Bioenergetics in Older Adults

NCT02445066
View directory record Official record
Conditions
Low 25-hydroxyvitamin D Concentrations
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
65 Years to 89 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 14, 2018 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Prior Exposure to Conflicting Health Information on Responses to Subsequent Unrelated Health Messages

NCT04247529
View directory record Official record
Conditions
Communication Research
Interventions
Exposure to conflicting health information, No exposure to conflicting health information
Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
6,046 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 9, 2020 · Synced Sep 12, 2026, 1:46 PM EDT
Terminated Phase 3 Interventional

Chemoprevention of Colorectal Adenomas

NCT00486512
View directory record Official record
Conditions
Adenomatous Polyps
Interventions
0.5 mg calcitriol (1a -25-dihydroxycholecalciferol), 75 mg acetylsalicylic acid (ASA) + 1250 mg calcium carbonate (CaCO3), placebo to 0.5 mg calcitriol (1a -25-dihydroxycholecalciferol), placebo to 75 mg acetylsalicylic acid (ASA) + 1250 mg calcium carbonate (CaCO3), Colonoscopy
Drug · Procedure
Lead sponsor
Colotech A/S
Industry
Eligibility
40 Years to 75 Years
Enrollment
350 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
24
States / cities
Huntsville, Alabama • San Diego, California • Clearwater, Florida + 20 more
Source: ClinicalTrials.gov public record
Updated Sep 2, 2020 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of a Once Daily Calcium and Vitamin D Fortified Food Product to Improve Bone Microarchitecture

NCT02375503
View directory record Official record
Conditions
Bone Alteration, Dietary Modification
Interventions
Calcium/Vitamin D, Placebo
Dietary Supplement
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years to 42 Years
Enrollment
175 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated May 14, 2017 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional Results available

Cholecalciferol (Vitamin D3) Therapy in Chronic Kidney Disease (CKD) Subjects

NCT00427037
View directory record Official record
Conditions
Chronic Kidney Disease, Vitamin D Deficiency
Interventions
Cholecalciferol, Placebo
Drug
Lead sponsor
Atlanta VA Medical Center
Federal
Eligibility
18 Years to 85 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jul 21, 2015 · Synced Sep 12, 2026, 1:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Calcium Supplementation for a Healthy Weight-Lite (CaSHeW Lite)

NCT00386672
View directory record Official record
Conditions
Obesity, Overweight
Interventions
Reduced energy (lite) OJ fortified with Calcium and Vitamin D, Nutrition Counseling, Reduced energy (lite) OJ without Calcium and Vitamin D
Dietary Supplement · Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
83 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Sep 12, 2026, 1:46 PM EDT