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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: vitamin D Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

Nutritional Intervention for Age-related Muscular Function and Strength Losses-Study 2

NCT02043171
View directory record Official record
Conditions
Sarcopenia
Interventions
Placebo, HMB plus Vitamin D, Non-Exercise, Exercise
Dietary Supplement · Drug · Behavioral
Lead sponsor
Metabolic Technologies Inc.
Industry
Eligibility
60 Years and older
Enrollment
238 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
1
States / cities
Ames, Iowa
Source: ClinicalTrials.gov public record
Updated Feb 10, 2019 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 1 Interventional Results available

Clearance of 25-hydroxyvitamin D3 During Vitamin D3 Supplementation

NCT03576716
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
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated May 16, 2022 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 4 Interventional Results available

Repeated-dose Safety, Efficacy, Pharmacokinetic and Pharmacodynamic of CTAP101, Immediate-release Calcifediol, High-dose Cholecalciferol, and Paricalcitol Plus Low-dose Cholecalciferol in Patients With Secondary Hyperparathyroidism, Chronic Kidney Disease 3-4 and Vitamin D Insufficiency

NCT03588884
View directory record Official record
Conditions
Secondary Hyperparathyroidism Due to Renal Causes, Vitamin D Insufficiency, CKD Stage 3, CKD Stage 4
Interventions
Calcifediol Oral Capsule, Calcifediol Oral Product, Cholecalciferol, Paricalcitol Oral Capsule
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
3
States / cities
Garden Grove, California • Chicago, Illinois • West Bend, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 8, 2022 · Synced Sep 28, 2026, 7:13 PM EDT
Completed No phase listed Observational

Analysis of Hypovitaminosis D and Osteopenia/Osteoporosis in Spinal Disease Patients Who Underwent a Spinal Fusion at Illinois Neurological Institute, Peoria, IL., a Retrospective Review From November 1, 2012 to October 31, 2014 and Prospective Pilot From July 1, 2015-June 30, 2016

NCT02534714
View directory record Official record
Conditions
Hypovitaminosis D, Spinal Disease, Osteoporosis
Interventions
Not listed
Lead sponsor
OSF Healthcare System
Other
Eligibility
50 Years and older
Enrollment
460 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2015
U.S. locations
1
States / cities
Peoria, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 27, 2018 · Synced Sep 28, 2026, 7:13 PM EDT
Terminated Phase 2 Interventional Results available

Calcitriol and Dexamethasone in Treating Patients With Prostate Cancer That Did Not Respond to Hormone Therapy

NCT00524589
View directory record Official record
Conditions
Prostate Cancer
Interventions
calcitriol, dexamethasone, protein expression analysis, laboratory biomarker analysis
Dietary Supplement · Drug · Genetic + 1 more
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
Up to 120 Years · Male only
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Nov 19, 2017 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Not applicable Interventional

Serum 25-hydroxy Vitamin D [25(OH)D] Levels, Supplemental Vitamin D, and Parathyroid Hormone Levels in Premature Infants

NCT01469650
View directory record Official record
Conditions
Premature Infants
Interventions
cholecalciferal, cholecalciferol
Dietary Supplement
Lead sponsor
University of Nebraska
Other
Eligibility
23 Weeks to 32 Weeks
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 5, 2023 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Pilot Pharmacokinetic Study of Daily Versus Monthly High-Dose Cholecalciferol Supplementation

NCT01079923
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Single High Dose Cholecalciferol, Daily Dose Cholecalciferol
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Nov 19, 2012 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 1 Interventional

Cord Blood Plus Vitamin D and Omega 3s in T1D

NCT00873925
View directory record Official record
Conditions
Type 1 Diabetes
Interventions
Autologous UCB, Omega 3 FA, Vitamin D
Biological · Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
1 Year to 18 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 3, 2013 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Not applicable Interventional

Vitamin D Effect on Calcium Absorption on Persons on Hemodialysis

NCT01325610
View directory record Official record
Conditions
Chronic Kidney Disease, End Stage Renal Disease, Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
19 Years and older
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Apr 3, 2012 · Synced Sep 28, 2026, 7:13 PM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Averting Complications of Proton Pump Inhibitor Therapy by Effervescent Calcium Magnesium Citrate

NCT03812380
View directory record Official record
Conditions
Osteoporosis, Hypomagnesemia
Interventions
EffCaMgCit, Placebo
Drug · Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
21 Years to 99 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Aug 16, 2022 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 3 Interventional

Risedronate in Preventing Bone Loss in Premenopausal Women Receiving Chemotherapy for Primary Breast Cancer

NCT00054418
View directory record Official record
Conditions
Breast Cancer, Osteoporosis
Interventions
calcium carbonate, vitamin D, risedronate sodium, placebo
Dietary Supplement · Drug · Other
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older · Female only
Enrollment
216 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
198
States / cities
Mobile, Alabama • Scottsdale, Arizona • Aurora, Colorado + 124 more
Source: ClinicalTrials.gov public record
Updated Jul 12, 2016 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 1 Interventional

Vitamin D as a Nutritional Neoadjuvant During Photodynamic Therapy of Basal Cell Carcinoma

NCT03467789
View directory record Official record
Conditions
Basal Cell Carcinoma, Basal Cell Nevus Syndrome
Interventions
Dietary Vitamin D3 pre-treatment, Photodynamic therapy, Serum Maintenance Vitamin D3
Drug · Radiation
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
Not listed
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
2
States / cities
Phoenix, Arizona • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 16, 2024 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Vitamin D HIV Study on Postmenopausal Women

NCT01375010
View directory record Official record
Conditions
HIV
Interventions
Vitamin D3, Placebo, Vitamin Supplements
Drug · Other
Lead sponsor
Columbia University
Other
Eligibility
40 Years to 70 Years · Female only
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 6, 2019 · Synced Sep 28, 2026, 7:13 PM 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 28, 2026, 7:13 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Effects of Anorexia Nervosa on Peak Bone Mass

NCT01301183
View directory record Official record
Conditions
Anorexia Nervosa
Interventions
RhIGF-1 with transdermal 17-beta estradiol, Placebo and transdermal 17-beta estradiol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
14 Years to 22 Years · Female only
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 12, 2021 · Synced Sep 28, 2026, 7:13 PM EDT
Completed No phase listed Observational

Serum Vitamin D Levels and Peripheral Neuropathy Among Multiple Myeloma Patients

NCT01697839
View directory record Official record
Conditions
Multiple Myeloma, Peripheral Neuropathy
Interventions
Not listed
Lead sponsor
Oncotherapeutics
Industry
Eligibility
18 Years and older
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
3
States / cities
Highland, California • West Hollywood, California • Hinsdale, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 4, 2018 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 2 Interventional Results available

Study Evaluating Changes In Bone Mineral Density (BMD), And Safety Of Rhbmp-2/CPM In Subjects With Decreased BMD

NCT00752557
View directory record Official record
Conditions
Osteoporosis
Interventions
rhBMP-2/CPM injection and bisphosphonates, calcium, and vitamin D (oral bisphosphonate therapy), bisphosphonates, calcium, and vitamin D
Drug
Lead sponsor
Pfizer
Industry
Eligibility
65 Years to 85 Years · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2015
U.S. locations
28
States / cities
Phoenix, Arizona • Tucson, Arizona • Sacramento, California + 15 more
Source: ClinicalTrials.gov public record
Updated Mar 19, 2020 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 2 Interventional Results available

Safety and Effectiveness of Alendronate for Bone Mineral Density in HIV-infected Children and Adolescents

NCT00921557
View directory record Official record
Conditions
HIV Infection
Interventions
Alendronate, Placebo, Calcium carbonate/vitamin D
Drug · Dietary Supplement
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
11 Years to 24 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2017
U.S. locations
7
States / cities
Los Angeles, California • Miami, Florida • Tampa, Florida + 4 more
Source: ClinicalTrials.gov public record
Updated Nov 4, 2021 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 4 Interventional Results available

Pilot Study for Zoledronic Acid to Prevent Bone Loss After Bariatric Surgery

NCT03424239
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Zoledronic Acid, Calcium citrate + vitamin D, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
25 Years to 100 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 28, 2021 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 2 Interventional Results available

A Study of Calcitriol BID Topical Treatment in Adolescents With Plaque Psoriasis

NCT00419666
View directory record Official record
Conditions
Chronic Plaque Psoriasis
Interventions
Calcitriol 3mcg/g
Drug
Lead sponsor
Galderma R&D
Industry
Eligibility
12 Years to 17 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
5
States / cities
Little Rock, Arkansas • San Diego, California • Eagan, Minnesota + 2 more
Source: ClinicalTrials.gov public record
Updated Feb 17, 2021 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 2Phase 3 Interventional

The Effect of Vitamin D and Calcium on Bone in Pediatric HIV

NCT00724178
View directory record Official record
Conditions
HIV Infection, Bone Mass
Interventions
cholecalciferol plus calcium carbonate
Dietary Supplement
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
6 Years to 16 Years
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 14, 2010 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Not applicable Interventional

Vitamin D for Improving Metabolic Control and Depressive Symptoms

NCT01185574
View directory record Official record
Conditions
Depressive Symptoms, Diabetes
Interventions
Vitamin D supplementation
Dietary Supplement
Lead sponsor
Loyola University
Other
Eligibility
18 Years and older · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 10, 2013 · Synced Sep 28, 2026, 7:13 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Role of Vitamin D in Female Reproductive Tract Immunity

NCT02186535
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D and Calcium
Dietary Supplement
Lead sponsor
CONRAD
Other
Eligibility
21 Years to 50 Years · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 7, 2016 · Synced Sep 28, 2026, 7:13 PM 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 Sep 28, 2026, 7:13 PM EDT