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ClinicalTrials.gov public records Last synced Oct 16, 2026, 3:20 AM EDT

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Showing 529–552 of 554 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D3, Cholecalciferol Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Status and Dose Response in Infants

NCT01042561
View directory record Official record
Conditions
Vitamin D, Prematurity
Interventions
Vitamin D3, vitamin D3 placebo
Dietary Supplement
Lead sponsor
University of Nebraska
Other
Eligibility
5 Minutes to 3 Months
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Sep 1, 2023 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

DAYLIGHT: Vitamin D Therapy in Individuals at High Risk of Hypertension

NCT01240512
View directory record Official record
Conditions
Hypertension, Vitamin D Deficiency, Pre-Hypertension
Interventions
Cholecalciferol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 50 Years
Enrollment
534 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
3
States / cities
Hartford, Connecticut • Boston, Massachusetts • Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 9, 2017 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Impact of Vitamin D Supplementation on Lactation Associated Bone Loss

NCT00903344
View directory record Official record
Conditions
Osteoporosis
Interventions
Vitamin D3, Multivitamin
Drug · Dietary Supplement
Lead sponsor
Leigh Eck, MD
Other
Eligibility
18 Years and older · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 18, 2014 · Synced Oct 16, 2026, 3:20 AM EDT
Not listed Phase 4 Interventional Accepts healthy volunteers

A Randomized Control Trial of Vitamin D Prophylaxis in the Prevention of Hypertensive Disorders of Pregnancy

NCT02920593
View directory record Official record
Conditions
Gestational Hypertension, Toxemia, Superimposed Preeclampsia, Eclampsia, HELLP Syndrome
Interventions
Vitamin D3
Drug
Lead sponsor
Stony Brook University
Other
Eligibility
18 Years and older · Female only
Enrollment
412 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Stony Brook, New York
Source: ClinicalTrials.gov public record
Updated Oct 5, 2017 · Synced Oct 16, 2026, 3:20 AM 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 9, 2022 · Synced Oct 16, 2026, 3:20 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Improving Functionality in Older People

NCT03611049
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
High dose Vitamin D3, Low dose Vitamin D3
Dietary Supplement
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
65 Years to 89 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Jul 23, 2019 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Phase 2 Interventional Results available

Activated Vitamin D for the Prevention and Treatment of Acute Kidney Injury

NCT02962102
View directory record Official record
Conditions
Critically Ill, Acute Kidney Injury
Interventions
Calcifediol, Calcitriol, Placebos
Drug
Lead sponsor
David Leaf
Other
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 29, 2025 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Phase 4 Interventional Results available

Novel Combination Therapy for Osteoporosis in Men

NCT03994172
View directory record Official record
Conditions
Male Osteoporosis
Interventions
Teriparatide or human parathyroid hormone (PTH) 1-34, Cinacalcet, placebo tablet, Calcium citrate tablet, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
60 Years to 85 Years · Male only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 3, 2026 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Phase 3 Interventional Results available

Vitamin D Supplementation in Multiple Sclerosis

NCT01490502
View directory record Official record
Conditions
Relapsing Remitting Multiple Sclerosis
Interventions
Vitamin D3
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 50 Years
Enrollment
172 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2021
U.S. locations
16
States / cities
Carmichael, California • San Francisco, California • Stanford, California + 12 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2022 · Synced Oct 16, 2026, 3:20 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Efficacy of Vitamin D Supplementation to Sustain Performance Outcomes

NCT07654777
View directory record Official record
Conditions
Acute Stress Reaction
Interventions
Vitamin D3 (Cholecalciferol), Oral Placebo Tablet
Dietary Supplement
Lead sponsor
Walter Reed Army Institute of Research (WRAIR)
Federal
Eligibility
18 Years to 40 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Phase 1Phase 2 Interventional

Weekly Vitamin D in Pediatric IBD

NCT02076750
View directory record Official record
Conditions
Inflammatory Bowel Diseases, Skin Pigmentation
Interventions
Vitamin D3 (cholecalciferol)
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
8 Years to 21 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 26, 2014 · Synced Oct 16, 2026, 3:20 AM EDT
Not listed Phase 4 Interventional

Vitamin D Augmentation of Tekturna (Aliskiren) in Hypertension

NCT01472796
View directory record Official record
Conditions
Hypertension
Interventions
Vitamin D (cholecalciferol), Tekturna(Aliskiren) plus placebo
Dietary Supplement · Drug
Lead sponsor
Wayne State University
Other
Eligibility
30 Years to 74 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Nov 16, 2011 · Synced Oct 16, 2026, 3:20 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Effectiveness of Vitamin D Supplementation

NCT02513823
View directory record Official record
Conditions
Elevated Blood Pressure, Endothelial Dysfunction
Interventions
2,000 International Units (IU)of vitamin D3
Dietary Supplement
Lead sponsor
Texas Woman's University
Other
Eligibility
18 Years and older · Female only
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Oct 4, 2019 · Synced Oct 16, 2026, 3:20 AM EDT
Terminated Phase 3 Interventional Results available

Safety and Efficacy of Hectorol in Pediatric Patients With Chronic Kidney Disease Stage 3 and 4 With Secondary Hyperparathyroidism Not Yet on Dialysis

NCT02859896
View directory record Official record
Conditions
Secondary Hyperparathyroidism-Chronic Kidney Disease
Interventions
Doxercalciferol (GZ427397), Calcitriol
Drug
Lead sponsor
Sanofi
Industry
Eligibility
5 Years to 18 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2025
U.S. locations
21
States / cities
Birmingham, Alabama • Los Angeles, California • Sacramento, California + 17 more
Source: ClinicalTrials.gov public record
Updated Jul 2, 2026 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Not applicable Interventional Results available

The VALIDATE-D Study

NCT01635062
View directory record Official record
Conditions
Type 2 Diabetes, Obesity
Interventions
Calcitriol, Placebo
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 11, 2017 · Synced Oct 16, 2026, 3:20 AM EDT
Recruiting Early Phase 1 Interventional

Vitamin D in Patients With Stage I-III Colon Cancer or Resectable Colon Cancer Liver Metastases

NCT02172651
View directory record Official record
Conditions
Stage, Colon Cancer, Stage I-III Colon Cancer, Stage IV Colon Cancer With Resectable Liver Metastases
Interventions
Vitamin D3, Placebo
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Not applicable Interventional Results available

Optimizing Vitamin D in the Elderly

NCT01554241
View directory record Official record
Conditions
Deficiency of Vitamin D3
Interventions
D3 2000 IU/day, D3 4000 IU/day, D3 50,000 IU weekly, vitamin D3 800 IU/day
Dietary Supplement
Lead sponsor
University of California, San Francisco
Other
Eligibility
65 Years and older
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Feb 18, 2015 · Synced Oct 16, 2026, 3:20 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 16, 2026, 3:20 AM 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 16, 2026, 3:20 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 30, 2013 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Phase 1 Interventional

Vitamin D Testing and Treatment for COVID 19

NCT04407286
View directory record Official record
Conditions
Covid 19, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Arizona State University
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Dec 30, 2021 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Phase 2 Interventional Results available

Prevention of Bone Loss After Pediatric Hematopoietic Cell Transplantation

NCT02074631
View directory record Official record
Conditions
Osteopenia, Osteoporosis
Interventions
Pamidronate, Calcium and vitamin D
Drug
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
1 Year to 20 Years
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
2
States / cities
Minneapolis, Minnesota • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Feb 20, 2024 · Synced Oct 16, 2026, 3:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption

NCT01508845
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
50 Years and older
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 21, 2014 · Synced Oct 16, 2026, 3:20 AM EDT
Terminated Phase 2 Interventional Results available

Studies With 1,25-Dihydroxycholecalciferol

NCT00001151
View directory record Official record
Conditions
Hypocalcemia, Rickets
Interventions
1,25-Dihydroxycholecalciferol
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
Not listed
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1976 – 2009
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 25, 2013 · Synced Oct 16, 2026, 3:20 AM EDT