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ClinicalTrials.gov public records Last synced Oct 15, 2026, 1:32 PM EDT

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Showing 409–432 of 438 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D placebo Clear all
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 15, 2026, 1:32 PM EDT
Completed Not applicable Interventional Results available

Vitamin D and Type 2 Diabetes Study

NCT01942694
View directory record Official record
Conditions
Prediabetes, Type 2 Diabetes
Interventions
Vitamin D (Cholecalciferol), Placebo
Dietary Supplement · Other
Lead sponsor
Tufts Medical Center
Other
Eligibility
30 Years and older
Enrollment
2,423 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
25
States / cities
Phoenix, Arizona • Los Angeles, California • Palo Alto, California + 20 more
Source: ClinicalTrials.gov public record
Updated Aug 16, 2022 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Vitamin D and Calcium on Genes in the Colon

NCT00298545
View directory record Official record
Conditions
Colorectal Polyps, Colorectal Adenoma, Adenocarcinoma
Interventions
placebo and Calcitriol, Calcium and Calcitriol
Drug
Lead sponsor
Rockefeller University
Other
Eligibility
48 Years to 72 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2009
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 18, 2011 · Synced Oct 15, 2026, 1:32 PM EDT
Terminated Phase 4 Interventional

Sustainability of Vitamin D Levels After Repletion With Ergocalciferol In Chronic Kidney Disease Stage 5D

NCT01312441
View directory record Official record
Conditions
Vitamin D Deficiency, Renal Failure Chronic Requiring Hemodialysis
Interventions
Ergocalciferol, Placebo
Drug
Lead sponsor
Albany College of Pharmacy and Health Sciences
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
4
States / cities
Albany, New York • Clifton Park, New York • Saratoga Springs, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 14, 2016 · Synced Oct 15, 2026, 1:32 PM EDT
Terminated Phase 4 Interventional Results available

Thiazolidinedione Intervention With Vitamin D Evaluation

NCT00879970
View directory record Official record
Conditions
Diabetes Mellitus, Type 2
Interventions
pioglitazone, rosiglitazone, placebo, Vitamin D, Placebo
Drug · Dietary Supplement
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
50 Years and older
Enrollment
1,332 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
23
States / cities
Long Beach, California • Los Angeles, California • Northridge, California + 19 more
Source: ClinicalTrials.gov public record
Updated Apr 18, 2017 · Synced Oct 15, 2026, 1:32 PM EDT
Withdrawn Not applicable Interventional

Vitamin D Status in Lower Extremity Joint Replacement Surgery Patients

NCT01858051
View directory record Official record
Conditions
Hypovitaminosis D
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 100 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Small Daily Doses of B-carotene on Breast Milk Retinol

NCT01803659
View directory record Official record
Conditions
Vitamin A Status
Interventions
b-carotene, retinyl palmitate, placebo
Dietary Supplement
Lead sponsor
University of California, Davis
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
85 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Jun 11, 2015 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Not applicable Interventional

Vitamin D Reabsorption in Adolescents and Young Adults With HIV Infection

NCT00490412
View directory record Official record
Conditions
HIV Infections
Interventions
Vitamin D supplement, Placebo
Dietary Supplement · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 24 Years
Enrollment
207 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
14
States / cities
Los Angeles, California • San Francisco, California • Washington D.C., District of Columbia + 10 more
Source: ClinicalTrials.gov public record
Updated Feb 28, 2017 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Phase 2Phase 3 Interventional

Vitamin D Supplementation for Extremely Preterm Infants

NCT01600430
View directory record Official record
Conditions
Vitamin D Deficiency, Preterm Infants, Bronchopulmonary Dysplasia
Interventions
Cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
1 Minute to 7 Days
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Feb 10, 2017 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate Oral Salmon Calcitonin in the Treatment of Osteoporosis in Postmenopausal Women Taking Calcium and Vitamin D

NCT00525798
View directory record Official record
Conditions
Osteoporosis
Interventions
SMC021 Oral calcitonin, SMC021 Placebo
Drug
Lead sponsor
Nordic Bioscience A/S
Industry
Eligibility
55 Years to 85 Years · Female only
Enrollment
4,665 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
3
States / cities
Gainesville, Georgia • Detroit, Michigan • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Oct 29, 2012 · Synced Oct 15, 2026, 1:32 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers Results available

LungVITamin D and OmegA-3 Trial (lungVITAL)

NCT01728571
View directory record Official record
Conditions
COPD, Asthma, Pulmonary Function, Pneumonia
Interventions
Vitamin D3, fish oil, Vitamin D3 placebo, Fish oil placebo
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years and older
Enrollment
25,871 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 7, 2026 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Calcium Supplement Particle Size and Vitamin D Supplement on Calcium Retention in Adolescent Girls

NCT01005381
View directory record Official record
Conditions
Osteoporosis
Interventions
Small Particle Size Calcium Carbonate Supplement, Large Particle Size Calcium Carbonate Supplement, Vitamin D, Calcium Placebo
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
12 Years to 14 Years · Female only
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 9, 2018 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Not applicable Interventional

Identifying Vitamin D Deficiency in Very Low Birth Weight Infant (VLBW) Infants Part 2

NCT01363167
View directory record Official record
Conditions
Infant, Very Low Birth Weight, Calcium Deficiency, Vitamin D Deficiency
Interventions
400 IU Cholecalciferol- Vitamin D Daily
Dietary Supplement
Lead sponsor
Medical University of South Carolina
Other
Eligibility
1 Day to 3 Days
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
2
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Nov 24, 2014 · Synced Oct 15, 2026, 1:32 PM EDT
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 15, 2026, 1:32 PM EDT
Completed Not applicable Interventional

Vitamin D Administration in the Nursing Home

NCT00204919
View directory record Official record
Conditions
Vitamin D Deficiency, Osteoporosis
Interventions
Vitamin D, placebo
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years and older
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2004
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Oct 15, 2026, 1:32 PM EDT
Recruiting Not applicable Interventional

Maternal Stress on Human Milk and Infant Outcomes

NCT04821544
View directory record Official record
Conditions
Postpartum Depression, Preterm Labor
Interventions
Mindfulness-based intervention (with a focus on self-compassion; MBSC), Vitamin D
Behavioral · Dietary Supplement
Lead sponsor
University of Idaho
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Coeur d'Alene, Idaho
Source: ClinicalTrials.gov public record
Updated Sep 11, 2026 · Synced Oct 15, 2026, 1:32 PM 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 15, 2026, 1:32 PM 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 15, 2026, 1:32 PM 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 15, 2026, 1:32 PM EDT
Completed Phase 3 Interventional

Effects of Teriparatide in the Treatment of Postmenopausal Women With Osteoporosis

NCT00670501
View directory record Official record
Conditions
Osteoporosis, Postmenopausal
Interventions
teriparatide, Placebo, Calcium Supplement, Vitamin D Supplement
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
30 Years to 85 Years · Female only
Enrollment
1,637 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 1999
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 1, 2008 · Synced Oct 15, 2026, 1:32 PM 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 15, 2026, 1:32 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin K to Slow Progression of Dyslipidemia and Diabetes Risk (Vita-K 'n' Kids Study II)

NCT02959762
View directory record Official record
Conditions
Obesity, Insulin Resistance, Obesity in Diabetes, Nutritional and Metabolic Diseases, Hyperlipidemia, Hyperglycemia, Cardiovascular Diseases
Interventions
Placebo-Control, Low-Dose Vitamin K2 (menaquinone-7; 45-mcg/d), High-Dose Vitamin K2 (menaquinone-7; 90 mcg/d)
Dietary Supplement
Lead sponsor
Augusta University
Other
Eligibility
8 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 20, 2019 · Synced Oct 15, 2026, 1:32 PM EDT
Completed Not applicable Interventional

Diabetes Visual Function Supplement Study

NCT01646047
View directory record Official record
Conditions
Diabetes Mellitus - Type 1, Diabetes Mellitus - Type 2, Non-proliferative Diabetic Retinopathy
Interventions
multi-component nutritional supplement capsules, multi-component dietary supplement
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jan 22, 2015 · Synced Oct 15, 2026, 1:32 PM 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 15, 2026, 1:32 PM EDT