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ClinicalTrials.gov public records Last synced Oct 16, 2026, 1:05 AM EDT

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Showing 457–480 of 960 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: cholecalciferol (vitamin D) Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D as a Supplement Against Falls in Elderly Study

NCT01827345
View directory record Official record
Conditions
Vitamin D Deficiency (10 ng/mL to 30 ng/mL)
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
70 Years and older
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 26, 2016 · Synced Oct 16, 2026, 1:05 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D3 Supplementation to Prevent Respiratory Tract Infections

NCT04596657
View directory record Official record
Conditions
Respiratory Tract Infections, Covid19, Flu Like Illness
Interventions
Vitamin D supplementation
Dietary Supplement
Lead sponsor
The Cooper Health System
Other
Eligibility
18 Years and older
Enrollment
877 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Camden, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 8, 2023 · Synced Oct 16, 2026, 1:05 AM EDT
Completed Phase 1 Interventional

Calcitriol Plus Dexamethasone in Treating Patients With Prostate Cancer That Has Not Responded to Hormone Therapy

NCT00010231
View directory record Official record
Conditions
Prostate Cancer
Interventions
calcitriol, dexamethasone
Dietary Supplement · Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older · Male only
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2002
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 30, 2015 · Synced Oct 16, 2026, 1:05 AM 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 3, 2025 · Synced Oct 16, 2026, 1:05 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin D Deficiency in Elderly African American Women in Central Texas

NCT01971411
View directory record Official record
Conditions
Vitamin D Deficiency, Osteoporosis, Osteopenia
Interventions
Calcium 500mg with 200 IU Vitamin D - 2 tablets daily, Blood levels of Vitamin D, Serum CTX, Mg, Ca++ and iPTH, Usual sun exposure documentation, Dietary intake of calcium, vitamin D, magnesium
Drug · Procedure · Behavioral
Lead sponsor
McLennan County Medical Education and Research Foundation
Other
Eligibility
70 Years and older · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2007
U.S. locations
1
States / cities
Waco, Texas
Source: ClinicalTrials.gov public record
Updated Mar 30, 2018 · Synced Oct 16, 2026, 1:05 AM EDT
Withdrawn Phase 4 Interventional

Sustained Effect of Urticaria Remission With Relatively High Dose Vitamin D Supplementation After Omalizumab Discontinuation

NCT02742805
View directory record Official record
Conditions
Urticaria
Interventions
Vitamin D (4,000 IU/day), Vitamin D (400 IU/day), Omalizumab
Dietary Supplement · Drug
Lead sponsor
Selina Gierer, D.O.
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated May 1, 2018 · Synced Oct 16, 2026, 1:05 AM EDT
Terminated Not applicable Interventional Results available

Stem Cell Recruitment in Osteoporosis Therapy

NCT01656629
View directory record Official record
Conditions
Low Bone Density
Interventions
Teriparatide, Alendronate, calcium and vitamin D
Drug · Dietary Supplement
Lead sponsor
Johns Hopkins University
Other
Eligibility
50 Years to 80 Years · Female only
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2020
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 21, 2020 · Synced Oct 16, 2026, 1:05 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D and Marine Omega-3 Fatty Acids on Anemia

NCT01632761
View directory record Official record
Conditions
Anemia
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
2,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 21, 2025 · Synced Oct 16, 2026, 1:05 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D to Prevent Autism in Newborn Siblings

NCT01366885
View directory record Official record
Conditions
Autistic Disorder
Interventions
Vitamin D3
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
20 Years to 44 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2016
U.S. locations
1
States / cities
Oregon City, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 14, 2016 · Synced Oct 16, 2026, 1:05 AM EDT
Completed No phase listed Observational

Association Between Vitamin D and Inflammation and Diabetes Risk in Morbidly Obese Pre-Menopausal Women

NCT02169050
View directory record Official record
Conditions
Insulin Sensitivity
Interventions
Not listed
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
21 Years to 49 Years · Female only
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 5, 2020 · Synced Oct 16, 2026, 1:05 AM 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 13, 2014 · Synced Oct 16, 2026, 1:05 AM 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 16, 2026, 1:05 AM EDT
Completed Not applicable Interventional

Differential Effects of Ergocalciferol and Cholecalciferol Therapies in Chronic Kidney Disease

NCT01835691
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Vitamin D2 (ergocalciferol), Vitamin D3 (cholecalciferol)
Dietary Supplement
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Oct 19, 2017 · Synced Oct 16, 2026, 1:05 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating Whole Foods Supplementation on Cognition

NCT01672359
View directory record Official record
Conditions
Sub-optimal Cognitive Function, Sub-optimal Immune Function
Interventions
Ginkgo Synergy® and Choline, OPC Synergy® and Catalyn, Placebo
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
60 Years and older
Enrollment
97 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Aug 6, 2014 · Synced Oct 16, 2026, 1:05 AM EDT
Completed Phase 4 Interventional Results available

Zoledronic Acid for Osteoporotic Fracture Prevention (ZEST II)

NCT02589600
View directory record Official record
Conditions
Osteoporotic Fractures, Osteoporosis, Postmenopausal
Interventions
Zoledronic acid, vitamin D, calcium, Saline
Drug · Dietary Supplement · Other
Lead sponsor
Susan L. Greenspan
Other
Eligibility
65 Years and older · Female only
Enrollment
310 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2022
U.S. locations
1
States / cities
New Kensington, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 26, 2023 · Synced Oct 16, 2026, 1:05 AM 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 3, 2020 · Synced Oct 16, 2026, 1:05 AM EDT
Completed Phase 3 Interventional Results available

Second Study of the Effect of Teriparatide on Hip Fracture Healing

NCT01473602
View directory record Official record
Conditions
Femur Neck Fracture
Interventions
Teriparatide, Placebo, Calcium supplementation, Vitamin D supplementation
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
50 Years and older
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
19
States / cities
San Diego, California • Golden, Colorado • Washington D.C., District of Columbia + 16 more
Source: ClinicalTrials.gov public record
Updated Apr 16, 2015 · Synced Oct 16, 2026, 1:05 AM 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 16, 2026, 1:05 AM EDT
Completed Not applicable Interventional

Changes in Gut Hormones, Body Composition and Energy Expenditure After Roux-en-Y

NCT02048501
View directory record Official record
Conditions
Obesity, Weight Loss
Interventions
Resting Metabolic Rate (RMR), Duel-energy x-ray absorptiometry (DEXA), Visual Analog Scale (VAS), Meal Stimulation Test
Other
Lead sponsor
Duke University
Other
Eligibility
18 Years to 65 Years
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 26, 2017 · Synced Oct 16, 2026, 1:05 AM EDT
Terminated Phase 4 Interventional Results available

Vitamin D Deficiency in Patients With Hypertension

NCT00974922
View directory record Official record
Conditions
Vitamin D Deficiency, Hypertension
Interventions
Aliskiren, Cholecalciferol, Placebo
Drug · Dietary Supplement
Lead sponsor
UConn Health
Other
Eligibility
21 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 9, 2018 · Synced Oct 16, 2026, 1:05 AM EDT
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 16, 2026, 1:05 AM EDT
Completed Phase 4 Interventional

Vitamin and Asthma Study

NCT01447173
View directory record Official record
Conditions
Asthma
Interventions
Vitamin D
Drug
Lead sponsor
Augusta University
Other
Eligibility
7 Years to 17 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Oct 23, 2012 · Synced Oct 16, 2026, 1:05 AM EDT
Completed Phase 4 Interventional Results available

Impact on Reducing the Incidence of Low Serum Calcium by Providing Educational Materials on the Need to Take Daily Supplemental Calcium and Vitamin D to Patients With Paget's Disease Treated With Reclast®

NCT00668200
View directory record Official record
Conditions
Paget's Disease of the Bone, Hypocalcemia
Interventions
Reclast (ZOL446, zoledronic acid), Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
Not listed
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
9
States / cities
Phoenix, Arizona • Tucson, Arizona • Gainesville, Georgia + 6 more
Source: ClinicalTrials.gov public record
Updated Mar 6, 2015 · Synced Oct 16, 2026, 1:05 AM 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 16, 2026, 1:05 AM EDT