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ClinicalTrials.gov public records Last synced Oct 14, 2026, 9:29 AM EDT

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Showing 193–216 of 326 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Oral vitamin D3 Clear all
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Improving the Understanding of the Response to Vitamin D Supplementation

NCT01465178
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
50 Years to 100 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 25, 2016 · Synced Oct 14, 2026, 9:29 AM EDT
Withdrawn Phase 2Phase 3 Interventional

The Effect of Vitamin D on Urinary Calcium Excretion in Kidney Stone Formers With High Urinary Calcium

NCT00948740
View directory record Official record
Conditions
Vitamin D Deficiency, Nephrolithiasis
Interventions
vitamin D (ergocalciferol)
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2017 · Synced Oct 14, 2026, 9:29 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Evaluating Response to Vitamin D3 and K2 Supplementation in Healthcare Personnel

NCT07199829
View directory record Official record
Conditions
Hypovitaminosis D, Hypovitaminosis
Interventions
Vitamin Arm 1, Vitamin Arm 2, Vitamin Arm 3, Placebo
Dietary Supplement · Other
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 69 Years
Enrollment
96 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Sep 30, 2025 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Vitamin D and Residual Beta-Cell Function in Type 1 Diabetes

NCT03046927
View directory record Official record
Conditions
Type 1 Diabetes
Interventions
Ergocalciferol, Placebo
Drug · Other
Lead sponsor
Benjamin U. Nwosu, MD
Other
Eligibility
10 Years to 21 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 10, 2024 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 3 Interventional

Vitamin D for Enhancing the Immune System in Cystic Fibrosis (DISC Study)

NCT01426256
View directory record Official record
Conditions
Cystic Fibrosis, Respiratory Tract Infections
Interventions
Cholecalciferol
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
16 Years and older
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
5
States / cities
Birmingham, Alabama • Atlanta, Georgia • Iowa City, Iowa + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 13, 2017 · Synced Oct 14, 2026, 9:29 AM 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 14, 2026, 9:29 AM EDT
Terminated Phase 2 Interventional

A Phase II Trial of Calcitriol and Naproxen in Patients With Recurrent Prostate Cancer

NCT00383487
View directory record Official record
Conditions
Prostatic Neoplasms, Prostate Cancer
Interventions
Calcitriol, Naproxen-n-butyl nitrate
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 90 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jan 28, 2013 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Effects of Electrical Stimulation and Vitamin D Supplementation on Bone Health Following Spinal Cord Injury.

NCT05008484
View directory record Official record
Conditions
Spinal Cord Injury
Interventions
NMES, Vitamin D, Passive movement
Device · Drug · Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 65 Years
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 23, 2026 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 4 Interventional Results available

Study of the Effect of Velaglucerase Alfa (VPRIV®) on Bone-related Pathology in Treatment-naïve Participants With Type 1 Gaucher Disease

NCT02574286
View directory record Official record
Conditions
Gaucher Disease
Interventions
Velaglucerase alfa, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Shire
Industry
Eligibility
18 Years to 70 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
8
States / cities
Beverly Hills, California • Los Angeles, California • Atlanta, Georgia + 5 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2022 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Treatment of Vitamin D Insufficiency

NCT00933244
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
High Dose Vitamin D3, Low Dose Vitamin D3, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Up to 75 Years · Female only
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 10, 2015 · Synced Oct 14, 2026, 9:29 AM EDT
Terminated Not applicable Interventional Results available

Vitamin D Deficiency and Atopic Dermatitis

NCT01337635
View directory record Official record
Conditions
Atopic Dermatitis, Vitamin D Deficiency
Interventions
Vitamin D
Drug
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
1 Year to 18 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 5, 2018 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 3 Interventional Results available

Secondary Prevention of Osteoporosis

NCT00421343
View directory record Official record
Conditions
Osteoporosis
Interventions
alendronate with cholecalciferol, calcium carbonate with cholecalciferol, Falls prevention measures
Drug · Behavioral
Lead sponsor
Hebrew SeniorLife
Other
Eligibility
65 Years and older
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 5, 2020 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Not applicable Interventional Results available

Vitamin D Oral Replacement in Asthma

NCT03686150
View directory record Official record
Conditions
Asthma, Vitamin D Deficiency, Pediatric Obesity
Interventions
Vitamin D3 oral regimen
Dietary Supplement
Lead sponsor
IDeA States Pediatric Clinical Trials Network
Network
Eligibility
6 Years to 17 Years
Enrollment
112 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
15
States / cities
Little Rock, Arkansas • Wilmington, Delaware • Honolulu, Hawaii + 12 more
Source: ClinicalTrials.gov public record
Updated Apr 19, 2023 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 3 Interventional Results available

High Dose Preoperative Cholecalciferol Supplementation and Perioperative Vitamin D Status

NCT01689779
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
100,000 IU cholecalciferol, Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 28, 2017 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Deficiency in Adolescent Girls

NCT01180946
View directory record Official record
Conditions
Healthy, Vitamin D Deficiency
Interventions
ergocalciferol, placebo pill
Dietary Supplement · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
9 Years to 18 Years · Female only
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 5, 2013 · Synced Oct 14, 2026, 9:29 AM EDT
Terminated Phase 3 Interventional Results available

Phase 3 Safety and Efficacy Study of CTAP101 Extended-release Capsules in Children With Secondary Hyperparathyroidism

NCT05543928
View directory record Official record
Conditions
Chronic Kidney Disease stage3, Chronic Kidney Disease stage4, Vitamin d Deficiency, Secondary Hyperparathyroidism
Interventions
CTAP101, Placebo
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
8 Years to 17 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
2
States / cities
Columbus, Ohio • Greenville, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 25, 2025 · Synced Oct 14, 2026, 9:29 AM 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 14, 2026, 9:29 AM EDT
Terminated Phase 1 Interventional

Treatment of Vitamin D Deficiency With Large Bolus Cholecalciferol

NCT04120064
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Cholecalciferol
Drug
Lead sponsor
Parkview Medical Center
Other
Eligibility
18 Years to 75 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Pueblo, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 2 Interventional Results available

RA-2 13-cis Retinoic Acid (Isotretinoin)

NCT02061384
View directory record Official record
Conditions
Male Infertility, Klinefelter's Syndrome, Y-chromosome Microdeletions
Interventions
13-cis retinoic acid, Calcitriol
Drug
Lead sponsor
University of Washington
Other
Eligibility
21 Years to 60 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 2, 2021 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Inadequacy in Rural Populations, Evaluation of Correction by Food Supplementation

NCT00690417
View directory record Official record
Conditions
Vitamin D Insufficiency, Vitamin D Deficiency
Interventions
Cholecalciferol (vitamin D3)
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years and older · Female only
Enrollment
108 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2011
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 24, 2011 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 2 Interventional Results available

Exemestane and Celecoxib in Postmenopausal Women at High Risk for Breast Cancer

NCT00073073
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Exemestane, Calcium carbonate, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Georgetown University
Other
Eligibility
Female only
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2011
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated May 17, 2016 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 4 Interventional Results available

A Study That Will Compare the Effect of Two Drugs on Participants With Low Bone Mass and a Recent Hip Fracture

NCT00887354
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Risedronate, Placebo, Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
50 Years and older
Enrollment
224 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
6
States / cities
Fort Lauderdale, Florida • New Port Richey, Florida • Orlando, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 25, 2019 · Synced Oct 14, 2026, 9:29 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D Dose Finding Study

NCT01092338
View directory record Official record
Conditions
HIV Infections, AIDS
Interventions
Cholecalciferol (Vit D3)
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
5 Years to 24 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 18, 2013 · Synced Oct 14, 2026, 9:29 AM EDT
Withdrawn Not applicable Interventional

The Effects of Active VItamin D on Left Atrial Volume Index

NCT01630408
View directory record Official record
Conditions
Heart Failure
Interventions
Paricalcitol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 16, 2013 · Synced Oct 14, 2026, 9:29 AM EDT