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Showing 1–24 of 169 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin D intervention Clear all
Withdrawn No phase listed Observational

Bariatric Surgery Outcomes

NCT01057784
View directory record Official record
Conditions
Morbid Obesity
Interventions
Bariatric surgery.
Procedure
Lead sponsor
University of California, Los Angeles
Other
Eligibility
Not listed
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Dec 7, 2014 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Precision Nutrition Impact on Health-Related Behavior Change

NCT04959318
View directory record Official record
Conditions
Metabolic Syndrome
Interventions
Professional nutrition counseling, No professional nutrition counseling
Other
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 45 Years
Enrollment
138 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Feb 10, 2025 · Synced Sep 8, 2026, 1:07 AM EDT
Terminated Phase 2 Interventional

Calcitriol in Preventing Prostate Cancer in Patients With Prostatic Intraepithelial Neoplasia

NCT00118066
View directory record Official record
Conditions
Precancerous/Nonmalignant Condition, Prostate Cancer
Interventions
calcitriol, observation
Dietary Supplement · Procedure
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older · Male only
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2011
U.S. locations
5
States / cities
East Brunswick, New Jersey • Morristown, New Jersey • New Brunswick, New Jersey + 1 more
Source: ClinicalTrials.gov public record
Updated May 26, 2015 · Synced Sep 8, 2026, 1:07 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Bioavailability of Vitamin D(25(OH)D) and Omega-3 Fatty Acid (DHA) Enhanced Chicken

NCT05248737
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
DHA/EPA fortified chicken plus Placebo, non-25(OH)D fortified chicken/eggs plus vitamin D3 supplement, non-DHA bio-enhanced chicken plus supplement DHA Omega-3, 25(OH)D bioenhanced chicken and eggs plus placebo, Dietary Supplement: DHA/EPA fortified eggs plus Placebo, non-DHA bio-enhanced eggs plus supplement DHA Omega-3, non-25(OH)D fortified chicken/eggs plus placebo
Dietary Supplement · Other
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 35 Years
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Mar 31, 2026 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Phase 3 Interventional Results available

Chemotherapy and Radiation Therapy in Treating Young Patients With Newly Diagnosed, Previously Untreated, High-Risk Medulloblastoma/PNET

NCT00392327
View directory record Official record
Conditions
Anaplastic Medulloblastoma, Medulloblastoma
Interventions
Biospecimen Collection, Carboplatin, Cisplatin, Cyclophosphamide, Filgrastim, Isotretinoin, Lumbar Puncture, Magnetic Resonance Imaging, Quality-of-Life Assessment, Radiation Therapy, Vincristine Sulfate
Procedure · Drug · Biological + 2 more
Lead sponsor
Children's Oncology Group
Network
Eligibility
3 Years to 22 Years
Enrollment
379 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2026
U.S. locations
170
States / cities
Birmingham, Alabama • Anchorage, Alaska • Mesa, Arizona + 126 more
Source: ClinicalTrials.gov public record
Updated Jun 7, 2026 · Synced Sep 8, 2026, 1:07 AM EDT
Recruiting Phase 3 Interventional

Vitamin D and Type 2 Diabetes - Treat-To-Target

NCT07448974
View directory record Official record
Conditions
Prediabetes, Type 2 Diabetes (T2DM)
Interventions
Vitamin D (Cholecalciferol ), Placebo
Drug
Lead sponsor
Tufts Medical Center
Other
Eligibility
30 Years to 74 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2031
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional Results available

Treatment of Vitamin D Deficiency in Intestinal Rehabilitation Clinic Patients With a Portable Ultraviolet B Lamp

NCT01930539
View directory record Official record
Conditions
Vitamin D Deficiency, Short Bowel Syndrome
Interventions
Ultraviolet B lamp
Device
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 3, 2023 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional

Correlation Between Vitamin D Status and Bone Mineral Density in Patients With Hemophilia

NCT01090206
View directory record Official record
Conditions
Hemophilia A, Hemophilia B, Vitamin D Deficiency
Interventions
Vitamin D and calcium
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
2 Years to 21 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 28, 2016 · Synced Sep 8, 2026, 1:07 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Relationships Between Vitamin D and Orthopedic Trauma

NCT04564625
View directory record Official record
Conditions
Fracture, Fracture Nonunion, Fractures, Bone, Vitamin D
Interventions
Vitamin D Assessment, Fracture
Other
Lead sponsor
Methodist Health System
Other
Eligibility
18 Years to 25 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 18, 2026 · Synced Sep 8, 2026, 1:07 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Physiological and Dietary Characteristics of Boys and Girls High School Basketball Players

NCT05658159
View directory record Official record
Conditions
Bone Health
Interventions
Vitamin D, DXA scan, Nutrition analysis
Diagnostic Test · Other
Lead sponsor
PepsiCo Global R&D
Industry
Eligibility
14 Years to 19 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Bradenton, Florida
Source: ClinicalTrials.gov public record
Updated Jan 9, 2024 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Early Phase 1 Interventional

RANKL Inhibition and Breast Tissue Biomarkers

NCT03629717
View directory record Official record
Conditions
Breast Cancer Prevention, Mammographic Density
Interventions
Ultrasound-guided core needle biopsy, Denosumab, Blood draw, Calcium, Vitamin D
Procedure · Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
35 Years and older · Female only
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Oct 15, 2024 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Evaluating the Effect of SOLIUS UV Light Source in Improving Vitamin D Status

NCT04780776
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency
Interventions
UVB treatment, Sham comparator
Device
Lead sponsor
Boston University
Other
Eligibility
22 Years and older
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 21, 2024 · Synced Sep 8, 2026, 1:07 AM EDT
Active, not recruiting Not applicable Interventional

The TRIABETES - ARMMS-T2D Study: A Randomized Trial to Compare Surgical and Medical Treatments for Type 2 Diabetes

NCT01047735
View directory record Official record
Conditions
Type 2 Diabetes Mellitus, Obesity
Interventions
Roux-en-Y Gastric Bypass Surgery, Laparoscopic Adjustable Gastric Banding, Lifestyle Weight Loss Intervention
Procedure · Behavioral
Lead sponsor
University of Pittsburgh
Other
Eligibility
25 Years to 55 Years
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2028
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Phase 2 Interventional Results available

Safety, Feasibility and Efficacy of Vitamin D Supplementation in Women With Metastatic Breast Cancer (SAFE-D)

NCT02186015
View directory record Official record
Conditions
Adult Women, Metastatic Breast Cancer, Estrogen Receptor Positive
Interventions
Cholecalciferol
Drug
Lead sponsor
Loyola University
Other
Eligibility
18 Years and older · Female only
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated May 13, 2021 · Synced Sep 8, 2026, 1:07 AM EDT
Withdrawn Phase 1Phase 2 Interventional

High Dose Cholecalciferol to Reduce the Incidence of Gestational Diabetes in High Risk Pregnant Women

NCT03037593
View directory record Official record
Conditions
Gestational Diabetes
Interventions
4000 IU vitamin D3
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 31, 2019 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effect of Vitamin D Supplementation on Muscle Mass and Function

NCT01199926
View directory record Official record
Conditions
Obesity, Insulin Resistance, Inflammation
Interventions
Vitamin D, Placebo
Dietary Supplement · Drug
Lead sponsor
Purdue University
Other
Eligibility
18 Years to 35 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 14, 2015 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Improving Community Ambulation After Hip Fracture

NCT01783704
View directory record Official record
Conditions
Hip Fracture
Interventions
Nutrition, PUSH, PULSE
Dietary Supplement · Behavioral
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
60 Years and older
Enrollment
210 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2017
U.S. locations
4
States / cities
Farmington, Connecticut • Baltimore, Maryland • Lebanon, New Hampshire + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 26, 2022 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D on 25-hydroxyvitamin D Levels and Physical Function

NCT02293187
View directory record Official record
Conditions
Vitamin D Deficiency, Sarcopenia
Interventions
vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Tufts University
Other
Eligibility
60 Years to 85 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 20, 2019 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Does Preoperative Calcium and Calcitriol Decrease Rates of Post Thyroidectomy Hypocalcemia?

NCT03869398
View directory record Official record
Conditions
Hypocalcemia, Thyroid Diseases
Interventions
Tums, Calcitriol
Dietary Supplement
Lead sponsor
Lahey Clinic
Other
Eligibility
18 Years and older
Enrollment
82 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Burlington, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 8, 2019 · Synced Sep 8, 2026, 1:07 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Vitamin D Deficiency and Vitamin D Supplementation on Glucose Metabolism

NCT00749918
View directory record Official record
Conditions
Prediabetes, Vitamin D Deficiency
Interventions
Cholecalciferol (vitamin D3)
Dietary Supplement
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 65 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 19, 2008 · Synced Sep 8, 2026, 1:07 AM EDT
Suspended Phase 1Phase 2 Interventional

Vitamin D and Bone Homeostasis in Ortho Polytrauma Patients

NCT03066817
View directory record Official record
Conditions
Vitamin D Deficiency, Polytrauma, Orthopedic Disorder
Interventions
Ergocalciferol 8000 IU/ML Oral Liquid [DRISDOL], Propylene Glycol
Drug
Lead sponsor
New York City Health and Hospitals Corporation
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Apr 3, 2019 · Synced Sep 8, 2026, 1:07 AM EDT
Terminated Not applicable Interventional

Nutrition Support to Improve Outcomes in Patients With Unresectable Pancreatic Cancer

NCT02681601
View directory record Official record
Conditions
Cancer of Pancreas
Interventions
Nutrawell Powder, Diet Only, OmegaRich fish oil supplement
Dietary Supplement · Other
Lead sponsor
Jonsson Comprehensive Cancer Center
Other
Eligibility
18 Years to 75 Years · Male only
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 2, 2022 · Synced Sep 8, 2026, 1:07 AM EDT
Recruiting Early Phase 1 Interventional

Immunological Effects of Vitamin D Replacement Among Black/African American Prostate Cancer Patients

NCT05045066
View directory record Official record
Conditions
Localized Prostate Carcinoma, Stage IV Prostate Cancer AJCC v8, Locally Recurrent Prostate Carcinoma, Metastatic Prostate Carcinoma
Interventions
Cholecalciferol, Quality-of-Life Assessment, Biospecimen Collection
Dietary Supplement · Other · Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older · Male only
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2029
U.S. locations
2
States / cities
Scottsdale, Arizona • Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 7, 2026 · Synced Sep 8, 2026, 1:07 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Effects of Exercise and Yogurt on Bone Mineral Density and Immunological Factors in Human Milk: The MEEMA Study

NCT03732261
View directory record Official record
Conditions
Lactational Amenorrhea, Body Weight Changes, Bone Loss
Interventions
Exercise and dietary
Other
Lead sponsor
North Carolina Agriculture & Technical State University
Other
Eligibility
25 Years to 40 Years · Female only
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Greensboro, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 22, 2023 · Synced Sep 8, 2026, 1:07 AM EDT