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ClinicalTrials.gov public records Last synced Oct 22, 2026, 7:14 PM EDT

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Showing 193–216 of 530 matching trials from the live ClinicalTrials.gov search.
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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 22, 2026, 7:14 PM EDT
Terminated Phase 2 Interventional Results available

Teriparatide (Forteo) in the Treatment of Patients With Postoperative Hypocalcemia

NCT00623974
View directory record Official record
Conditions
Hypocalcemia
Interventions
Teriparatide (Forteo), Calcium, Calcitriol
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Dec 6, 2012 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Not applicable Interventional Results available

Vitamin D Supplementation Reduces Renin-Angiotensin System Activity in Obesity

NCT01068418
View directory record Official record
Conditions
Obesity, Vitamin D Deficiency, Hypertension
Interventions
Vitamin D (cholecalciferol)
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 64 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Not applicable Interventional Results available

Calcitriol in Preventing Lung Cancer in Smokers and Former Smokers at High Risk of Lung Cancer

NCT00690924
View directory record Official record
Conditions
Lung Cancer, Precancerous Condition, Tobacco Use Disorder
Interventions
calcitriol, laboratory biomarker analysis, pharmacological study
Drug · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
40 Years to 79 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2018
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jun 4, 2018 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 1 Interventional

Effects of Vitamin D Replacement in Patients With Primary Hyperparathyroidism (PHPT)

NCT00538720
View directory record Official record
Conditions
Hyperparathyroidism
Interventions
Vitamin D, Four-dimensional computed tomography (4DCT)
Drug · Device
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
21 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2018
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 25, 2019 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Early Phase 1 Interventional Results available

Calcitriol Monotherapy for X-Linked Hypophosphatemia

NCT03748966
View directory record Official record
Conditions
X-linked Hypophosphatemia, Hypophosphatemic Rickets, Hypophosphatemic Rickets, X-Linked Dominant
Interventions
Calcitriol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
3 Years to 70 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Vitamin D Supplementation in HIV Youth

NCT01523496
View directory record Official record
Conditions
HIV Infections
Interventions
Vitamin D control dose, Vitamin D supplementation-
Drug
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
8 Years to 25 Years
Enrollment
190 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
2
States / cities
Atlanta, Georgia • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 8, 2018 · Synced Oct 22, 2026, 7:14 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 15, 2018 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Efficacy of Vitamin D Supplementation in Bariatric Surgery Patients

NCT01385098
View directory record Official record
Conditions
Obesity, Vitamin D Deficiency
Interventions
Vitamin D3 and Calcium
Dietary Supplement
Lead sponsor
Vadim Sherman, MD
Other
Eligibility
18 Years to 65 Years · Female only
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 23, 2018 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Vitamin D for COVID-19 Trial

NCT04536298
View directory record Official record
Conditions
COVID-19
Interventions
vitamin D, Placebo
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
2,024 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 24, 2025 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Not applicable Interventional Results available

A Trial of Vitamin D Therapy in Patients With Heart Failure

NCT01125436
View directory record Official record
Conditions
Heart Failure
Interventions
Cholecalciferol
Dietary Supplement
Lead sponsor
Case Western Reserve University
Other
Eligibility
50 Years and older
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 10, 2022 · Synced Oct 22, 2026, 7:14 PM EDT
Terminated Phase 2 Interventional Results available

Can Vitamin D3 Improve Cognitive Function in Individuals With Type 2 Diabetes? (THINK-D)

NCT02416193
View directory record Official record
Conditions
Diabetes, Executive Dysfunction
Interventions
Cholecalciferol
Drug
Lead sponsor
Loyola University
Other
Eligibility
18 Years to 75 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Oct 23, 2020 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Vitamin D Repletion on Insulin Resistance

NCT00606957
View directory record Official record
Conditions
Obesity
Interventions
Vitamin D3 (cholecalciferol)
Dietary Supplement
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 13, 2011 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 2 Interventional Results available

Zoledronic Acid in Preventing Osteoporosis in Patients Undergoing Donor Stem Cell Transplant

NCT00321932
View directory record Official record
Conditions
Leukemia, Lymphoma, Myelodysplastic Syndromes, Osteoporosis, Ovarian Cancer
Interventions
calcium, cholecalciferol, zoledronic acid
Dietary Supplement · Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
2
States / cities
Minneapolis, Minnesota • Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Mar 9, 2017 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 4 Interventional

Pharmacokinetic Comparison of Vitamin's D2 and D3 in Stage 5 Chronic Kidney Disease Patients on Chronic Hemodialysis

NCT01675557
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Vitamin D3, Vitamin D2, Placebo
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
20 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Feb 26, 2015 · Synced Oct 22, 2026, 7:14 PM 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 5, 2014 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 2 Interventional

Calcitriol, Mitoxantrone, and Prednisone in Treating Patients With Metastatic Prostate Cancer

NCT00182741
View directory record Official record
Conditions
Prostate Cancer
Interventions
calcitriol, mitoxantrone hydrochloride, prednisone
Dietary Supplement · Drug
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
18 Years to 100 Years · Male only
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated May 3, 2017 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 1Phase 2 Interventional

Vitamin D Deficiency and Replacement on Pulmonary and Endocrine Function in SCI

NCT02099955
View directory record Official record
Conditions
Spinal Cord Injury, Vitamin D Deficiency
Interventions
Vitamin D3
Drug
Lead sponsor
James J. Peters Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 75 Years
Enrollment
88 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Mar 7, 2017 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 1 Interventional

Vitamin D Therapy in Patients With Systemic Lupus Erythematosus (SLE)

NCT00418587
View directory record Official record
Conditions
Systemic Lupus Erythematosus
Interventions
Cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 85 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2014
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 18, 2018 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 1Phase 2 Interventional

Cholesterol in ASD: Characterization and Treatment

NCT00965068
View directory record Official record
Conditions
Autism, Asperger Disorder, PDD-NOS
Interventions
Cholesterol
Other
Lead sponsor
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
Eligibility
4 Years to 12 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 5, 2018 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Rayaldee for Treating Mild to Moderate COVID-19

NCT04551911
View directory record Official record
Conditions
COVID-19, Coronavirus, SARS-CoV2 Infection
Interventions
Rayaldee, Placebo
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
10
States / cities
San Francisco, California • Miami, Florida • Evanston, Illinois + 6 more
Source: ClinicalTrials.gov public record
Updated May 28, 2024 · Synced Oct 22, 2026, 7:14 PM EDT
Completed Phase 2 Interventional

Calcitriol and Docetaxel in Treating Patients With Metastatic or Locally Advanced Pancreatic Cancer

NCT00238199
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
calcitriol, docetaxel
Dietary Supplement · Drug
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2006
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 24, 2015 · Synced Oct 22, 2026, 7:14 PM EDT
Not listed Phase 2 Interventional Accepts healthy volunteers

Cyclic Versus Daily Teriparatide on Bone Mass

NCT00668941
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Alendronate, Calcium, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
Helen Hayes Hospital
Other
Eligibility
45 Years to 85 Years · Female only
Enrollment
140 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2017
U.S. locations
1
States / cities
West Haverstraw, New York
Source: ClinicalTrials.gov public record
Updated Aug 10, 2017 · Synced Oct 22, 2026, 7:14 PM 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 2, 2016 · Synced Oct 22, 2026, 7:14 PM EDT