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Showing 1–24 of 503 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamins A and D Clear all
Suspended Phase 2 Interventional

A Study of Gemcitabine ± Erlotinib and DN-101 Versus Gemcitabine ± Erlotinib and Placebo in Patients With Advanced Pancreatic Cancer

NCT00536770
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
placebo + gemcitabine + erlotinib, Placebo + gemcitabine, calcitriol + gemcitabine, calcitriol + gemcitabine + erlotinib
Drug
Lead sponsor
Novacea
Industry
Eligibility
18 Years and older
Enrollment
132 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2007
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 5, 2007 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Not applicable Interventional Results available

Vitamin D Absorption in HIV Infected Young Adults Being Treated With Tenofovir Containing cART

NCT01751646
View directory record Official record
Conditions
HIV Infection
Interventions
Vitamin D3 50,000 IU, Vitamin D3 placebo
Dietary Supplement
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
16 Years to 24 Years
Enrollment
214 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
16
States / cities
Los Angeles, California • Washington D.C., District of Columbia • Fort Lauderdale, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Mar 26, 2019 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Phase 4 Interventional

Comparison of Absorption of Vitamin D in Cystic Fibrosis

NCT01880346
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Vitamin D Powder, Vitamin D Oil
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 59 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 19, 2015 · Synced Sep 18, 2026, 1:18 AM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Immunotherapy After Transplantation for Skin Cancer Prevention in Organ Transplant Recipients

NCT04642287
View directory record Official record
Conditions
Immunotherapy, Cutaneous Squamous Cell Carcinoma, Actinic Keratoses, Organ Transplant Recipients, Skin Cancer
Interventions
Calcipotriol Only Product in Cutaneous Dose Form, Vaseline, Topical 5FU
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
50 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2030
U.S. locations
2
States / cities
Boston, Massachusetts • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 6, 2025 · Synced Sep 18, 2026, 1:18 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 18, 2026, 1:18 AM EDT
Not listed No phase listed Observational

Emulated Study of Vitamin D Correction Vs Non-Correction

NCT06366776
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
The Cooper Health System
Other
Eligibility
18 Years and older
Enrollment
9,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Camden, New Jersey
Source: ClinicalTrials.gov public record
Updated Jan 21, 2025 · Synced Sep 18, 2026, 1:18 AM EDT
Terminated Phase 2 Interventional Results available

Vitamin D and n-3 Polyunsaturated Fatty Acids (PUFAs) to Prevent Chronic Pain Following Major Thermal Burn Injury

NCT03313076
View directory record Official record
Conditions
Chronic Pain Following Thermal Burn Injury
Interventions
Omega-3 fatty acids (fish oil), Vitamin D3 (cholecalciferol), Vitamin D3 (cholecalciferol) placebo, Omega-3 fatty acid placebo
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 65 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated May 7, 2026 · Synced Sep 18, 2026, 1:18 AM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine as Post-Exposure Prophylaxis Against COVID-19 Infection

NCT04372017
View directory record Official record
Conditions
COVID-19, SARS-CoV 2
Interventions
Hydroxychloroquine, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Sanford Health
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Dec 9, 2021 · Synced Sep 18, 2026, 1:18 AM EDT
Withdrawn Phase 3 Interventional

Vitamin D Status in Patients With Severe Sepsis

NCT02684487
View directory record Official record
Conditions
Sepsis, Severe Sepsis, End Organ Damage, Multi Organ Failure
Interventions
vitamin D3, Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 80 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 4, 2021 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D Supplementation as a Neoadjuvant for Photodynamic Therapy of Actinic Keratoses

NCT04140292
View directory record Official record
Conditions
Actinic Keratosis
Interventions
Photodynamic therapy (PDT), Vitamin D3
Drug
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 23, 2022 · Synced Sep 18, 2026, 1:18 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 23, 2011 · Synced Sep 18, 2026, 1:18 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Prunes Preventing Bone Loss in Perimenopause

NCT07120997
View directory record Official record
Conditions
Perimenopausal Bone Loss
Interventions
Prunes, Calcium supplement, Vitamin D Supplement
Dietary Supplement
Lead sponsor
Penn State University
Other
Eligibility
44 Years to 55 Years · Female only
Enrollment
124 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 3, 2026 · Synced Sep 18, 2026, 1:18 AM EDT
Terminated Phase 1 Interventional

Randomized Study Of Exercise And Vitamin D In Frail Elderly Subjects

NCT00249704
View directory record Official record
Conditions
Elderly, Frail
Interventions
Vitamin D + Sham Exercise, Vitamin D Placebo + Exercise, Vitamin D Placebo + Sham Exercise, Vitamin D + Exercise
Drug · Procedure
Lead sponsor
Pfizer
Industry
Eligibility
75 Years and older
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
4
States / cities
Farmington, Connecticut • Hyattsville, Maryland • Roslindale, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 7, 2009 · Synced Sep 18, 2026, 1:18 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 12, 2024 · Synced Sep 18, 2026, 1:18 AM EDT
Not listed Not applicable Interventional

Vitamin D Supplementation and TB

NCT01992263
View directory record Official record
Conditions
Tuberculosis, Vitamin D, Immunity
Interventions
Vitamin D (600 IU), Vitamin D (2000 IU), Vitamin D (4000 IU), Placebo
Dietary Supplement · Other
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 60 Years
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Sep 8, 2020 · Synced Sep 18, 2026, 1:18 AM EDT
Active, not recruiting Not applicable Interventional

Cholecalciferol in Improving Survival in Patients With Newly Diagnosed Cancer With Vitamin D Insufficiency

NCT01787409
View directory record Official record
Conditions
Aggressive Non-Hodgkin Lymphoma, Anaplastic Large Cell Lymphoma, Angioimmunoblastic T-Cell Lymphoma, Chronic Lymphocytic Leukemia, Diffuse Large B-Cell Lymphoma, Enteropathy-Associated T-Cell Lymphoma, Hepatosplenic T-Cell Lymphoma, Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma, Mediastinal (Thymic) Large B-Cell Lymphoma, Nasal Type Extranodal NK/T-Cell Lymphoma, Peripheral T-Cell Lymphoma, Not Otherwise Specified, Primary Cutaneous Anaplastic Large Cell Lymphoma, Refractory Anaplastic Large Cell Lymphoma, Small Lymphocytic Lymphoma, Subcutaneous Panniculitis-Like T-Cell Lymphoma
Interventions
Cholecalciferol, Laboratory Biomarker Analysis
Dietary Supplement · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
565 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2028
U.S. locations
5
States / cities
Scottsdale, Arizona • Atlanta, Georgia • Iowa City, Iowa + 2 more
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Analyzing IBS to Identify Biomarkers and Microbiome Signatures

NCT02419963
View directory record Official record
Conditions
Diarrhoea Predominant Irritable Bowel Syndrome, IBS
Interventions
endoscopy for tissue biopsy, Blood Sample, Stool Sample
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 6, 2017 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Phase 2 Interventional

Reducing the Effects of Aging on Cognition With Therapeutic Intervention of an Oral Nutrient (REACTION): A Pilot Trial

NCT04147624
View directory record Official record
Conditions
Cognitive Decline
Interventions
Souvenaid, Placebo
Drug · Other
Lead sponsor
University of Miami
Other
Eligibility
55 Years to 89 Years
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 24, 2023 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

A Prospective Trial on the Effects of Vitamin D Supplementation in Collegiate Swimmers and Divers

NCT01488227
View directory record Official record
Conditions
Healthy
Interventions
Vitamin D, Placebo
Dietary Supplement
Lead sponsor
University of Kentucky
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Feb 24, 2013 · Synced Sep 18, 2026, 1:18 AM EDT
Terminated Not applicable Interventional Results available

Effects of Ergocalciferol on Erythropoetin Stimulating Agent Dose

NCT01263028
View directory record Official record
Conditions
Chronic Kidney Disease Stages 3-5
Interventions
Ergocalciferol supplementation
Drug
Lead sponsor
Kaiser Permanente
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 29, 2015 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study Assessing Dosing Time and Calcium and Vitamin D on the Relative BA of 35 mg DR Risedronate Dosed With Food

NCT00868907
View directory record Official record
Conditions
Healthy
Interventions
35 mg risedronate DR tablet
Drug
Lead sponsor
Warner Chilcott
Industry
Eligibility
40 Years to 70 Years · Female only
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
4
States / cities
Gainesville, Florida • Miami, Florida • Honolulu, Hawaii + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 11, 2011 · Synced Sep 18, 2026, 1:18 AM EDT
Completed Phase 3 Interventional Results available

Prophylaxis to Reduce Postoperative Atrial Fibrillation in Cardiac Surgery

NCT00953212
View directory record Official record
Conditions
Atrial Fibrillation, Atrial Flutter
Interventions
beta blockers, amiodarone, ascorbic acid
Drug
Lead sponsor
MaineHealth
Other
Eligibility
18 Years and older
Enrollment
304 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Portland, Maine
Source: ClinicalTrials.gov public record
Updated Apr 25, 2018 · Synced Sep 18, 2026, 1:18 AM EDT
Recruiting Phase 4 Interventional

Postpartum Vaginal Estrogen for Breastfeeding Patients

NCT05457972
View directory record Official record
Conditions
Breastfeeding, Postpartum Sexual Dysfunction, Vaginal Atrophy
Interventions
Estradiol, Vaginal Moisturizer
Drug · Device
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 22, 2026 · Synced Sep 18, 2026, 1:18 AM EDT
Not listed Not applicable Interventional

Diabetic Retinopathy Functional Evaluation Study: Monitoring Carotenoid Vitamins Treatment Using ERG

NCT04117022
View directory record Official record
Conditions
Diabetes, Diabetic Retinopathy
Interventions
DVS supplementation
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
21 Years to 80 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
2
States / cities
Pomona, California • Tahlequah, Oklahoma
Source: ClinicalTrials.gov public record
Updated Apr 22, 2021 · Synced Sep 18, 2026, 1:18 AM EDT