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Showing 1–24 of 344 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Vitamin D Deficiency Disease Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Consumption of Post-harvest UV-B Treated Mushrooms on Vitamin D Status of Healthy Adults

NCT01443897
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
1,000 IU vitamin D2, placebo capsule, mushrooms, UVB-treated mushrooms, 400 IU vitamin D2, UVB-treated mushrooms, 1,000 IU vitamin D2
Dietary Supplement · Other
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 59 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Sep 29, 2011 · Synced Sep 24, 2026, 3:53 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D Dose and Genotype of the Binding Protein in Infants and Children

NCT01050387
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Yale University
Other
Eligibility
6 Months to 6 Years
Enrollment
193 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 4, 2014 · Synced Sep 24, 2026, 3:53 AM EDT
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 25, 2016 · Synced Sep 24, 2026, 3:53 AM EDT
Terminated Not applicable Interventional

Vitamin D Supplementation in IBS

NCT03148288
View directory record Official record
Conditions
Irritable Bowel Syndrome, Vitamin D Deficiency, Abdominal Pain
Interventions
Vitamin D, placebo
Dietary Supplement
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 5, 2020 · Synced Sep 24, 2026, 3:53 AM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Vitamin D Ancillary Study in 5 Populations of African Origin

NCT02111902
View directory record Official record
Conditions
Cardiovascular Disease, Obesity
Interventions
Not listed
Lead sponsor
Loyola University
Other
Eligibility
25 Years to 44 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 29, 2017 · Synced Sep 24, 2026, 3:53 AM EDT
Completed No phase listed Observational Results available

Non-interventional Substudy of ALX-HPP-502 to Assess Natural History of Patients With Juvenile-onset HPP Who Served as Historical Controls in ENB-006-09

NCT02235493
View directory record Official record
Conditions
Hypophosphatasia, Bone Disease
Interventions
Retrospective Case Only
Biological
Lead sponsor
Alexion Pharmaceuticals, Inc.
Industry
Eligibility
5 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 12, 2019 · Synced Sep 24, 2026, 3:53 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Evaluate the Change in Iron, Vitamin D, and C-Reactive Protein Level (CRP) in a 12 to 24 Week Period

NCT01328704
View directory record Official record
Conditions
Anemia, Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
30 Years to 50 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Aug 24, 2014 · Synced Sep 24, 2026, 3:53 AM EDT
Completed No phase listed Observational

Assessment of Influence of Vitamin D on Insulin Secretion and Sensitivity in Obese Teenage Girls

NCT00851396
View directory record Official record
Conditions
Vitamin D Deficiency, Insulin Resistance, Insulin Sensitivity, Obesity
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
13 Years to 18 Years · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Sep 11, 2011 · Synced Sep 24, 2026, 3:53 AM EDT
Completed Phase 1 Interventional

A Study of KRN23 in X-linked Hypophosphatemia

NCT00830674
View directory record Official record
Conditions
X-linked Hypophosphatemia
Interventions
Placebo, KRN23
Drug
Lead sponsor
Kyowa Kirin Co., Ltd.
Industry
Eligibility
18 Years and older
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
4
States / cities
New Haven, Connecticut • Indianapolis, Indiana • Durham, North Carolina + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 16, 2024 · Synced Sep 24, 2026, 3:53 AM EDT
Terminated Not applicable Interventional

The Pittsburgh Vitamin D Study: Vitamin D Supplementation in Vitamin D-deficient Subjects at Risk of Lung Cancer

NCT02532062
View directory record Official record
Conditions
Deficiency of Vitamin D3, COPD
Interventions
Cholecalciferol, multivitamin, Placebo
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
50 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 25, 2018 · Synced Sep 24, 2026, 3:53 AM EDT
Completed Not applicable Interventional Results available

Treatment of Hypovitaminosis D in Rheumatoid Arthritis

NCT00423358
View directory record Official record
Conditions
Rheumatoid Arthritis, Hypovitaminosis D
Interventions
Vitamin D, placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 90 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 23, 2015 · Synced Sep 24, 2026, 3:53 AM 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 24, 2026, 3:53 AM EDT
Active, not recruiting Phase 2 Interventional

High-dose Vitamin D Supplements in Older Adults

NCT03613116
View directory record Official record
Conditions
Vitamin D Deficiency, Cognitive Decline
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
65 Years to 90 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Walnut Creek, California
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Sep 24, 2026, 3:53 AM EDT
Active, not recruiting Not applicable Interventional

ViDES Trial (Vitamin D Extra Supplementation)

NCT05459298
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Placebo, 800 IU/day vitamin D supplementation with feedings in the first 28 days after birth, Usual Care
Dietary Supplement · Other
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
24 Hours to 96 Hours
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Sep 24, 2026, 3:53 AM 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 24, 2026, 3:53 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D Supplementation During Pregnancy on Clinical Outcomes and Immune Function

NCT01417351
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU vitamin D3, 2,000 IU Vitamin D3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 45 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
2
States / cities
Davis, California • Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jul 22, 2013 · Synced Sep 24, 2026, 3:53 AM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Metformin, Vitamin D, and Depression in Polycystic Ovary Syndrome (PCOS) Trial

NCT03380091
View directory record Official record
Conditions
PCOS, Depression, Vitamin D Deficiency, Insulin Resistance
Interventions
Metformin, Vitamin D
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Feb 8, 2021 · Synced Sep 24, 2026, 3:53 AM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Vitamin D Deficiency in Subjects With Chronic Hepatitis C Compared to Healthy Volunteers

NCT01274013
View directory record Official record
Conditions
Chronic Hepatitis C
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
20 Years to 60 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2019
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Jan 9, 2019 · Synced Sep 24, 2026, 3:53 AM EDT
Recruiting Phase 2 Interventional

Vitamin A Supplementation in Allogeneic Stem Cell Transplantation.

NCT06450925
View directory record Official record
Conditions
Graft Vs Host Disease, Vitamin A Deficiency, Vitamin D Deficiency
Interventions
Vitamin A, Placebo
Drug · Other
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
18 Years and older
Enrollment
190 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
3
States / cities
Tampa, Florida • Buffalo, New York • Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 23, 2026 · Synced Sep 24, 2026, 3:53 AM EDT
Completed Phase 4 Interventional

Vitamin D Deficiency in Adults Following a Major Burn Injury

NCT05084248
View directory record Official record
Conditions
Vitamin D Deficiency, Burns
Interventions
Ergocalciferol Capsules
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 14, 2025 · Synced Sep 24, 2026, 3:53 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 8, 2017 · Synced Sep 24, 2026, 3:53 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 12, 2017 · Synced Sep 24, 2026, 3:53 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Establishing the Vitamin D Requirements During Lactation

NCT00412074
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU Vitamin D3 (cholecalciferol), 2400 IU Vitamin D3 (cholecalciferol), 6400 IU Vitamin D3 (cholecalciferol)
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
460 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2012
U.S. locations
2
States / cities
Rochester, New York • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 3, 2018 · Synced Sep 24, 2026, 3:53 AM 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 24, 2026, 3:53 AM EDT