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ClinicalTrials.gov public records Last synced Nov 15, 2026, 7:55 AM EST

All trial information on this site comes from the official ClinicalTrials.gov public API (clinicaltrials.gov/api/v2), run by the U.S. National Library of Medicine. We only display that public information; we do not add opinions, endorsements, or any other intent. Always review the official ClinicalTrials.gov record for the latest information.

Showing 289–312 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Obesity, Vitamin D Deficiency
Interventions: cholecalciferol; Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: 19 Years to 60 Years · Male only
Enrollment: 67 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Atopic Dermatitis, Vitamin D Deficiency
Interventions: Vitamin D; Drug
Lead sponsor: Medical College of Wisconsin; Other
Eligibility: 1 Year to 18 Years
Enrollment: 7 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2013
U.S. locations: 1
States / cities: Milwaukee, Wisconsin

Conditions: Neurofibromatosis Type 1 (NF1)
Interventions: Cholecalciferol; Drug
Lead sponsor: University of Utah; Other
Eligibility: 25 Years to 40 Years
Enrollment: 26 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2022
U.S. locations: 2
States / cities: Cincinnati, Ohio • Salt Lake City, Utah

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

Conditions: Eosinophilic Esophagitis
Interventions: Bone Mineral Density (DEXA) scan, Vitamin D Measurement, Height measurement, Assessment of medication compliance; Diagnostic Test · Other
Lead sponsor: Arkansas Children's Hospital Research Institute; Other
Eligibility: 5 Years to 12 Years
Timeline: 2018 – 2020
U.S. locations: 1
States / cities: Little Rock, Arkansas

Conditions: Prostate Cancer
Interventions: calcitriol, docetaxel; Drug
Lead sponsor: Novacea; Industry
Eligibility: 18 Years and older · Male only
Enrollment: 1,200 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2007
U.S. locations: 159
States / cities: Birmingham, Alabama • Muscle Shoals, Alabama • Anchorage, Alaska + 132 more

Conditions: Low Bone Density
Interventions: Not listed
Lead sponsor: Yale University; Other
Eligibility: 50 Years and older · Male only
Enrollment: 24 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2000 – 2008
U.S. locations: 1
States / cities: New Haven, Connecticut

Conditions: Stress Fracture
Interventions: Calcium & Vitamin D; Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: Female only
Enrollment: 5,201 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2002 – 2006
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Osteogenesis Imperfecta
Interventions: Vitamin D, Calcium; Dietary Supplement
Lead sponsor: Amgen; Industry
Eligibility: 5 Years to 19 Years
Enrollment: 71 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2026 – 2028
U.S. locations: 1
States / cities: Indianapolis, Indiana

Conditions: Vitamin D Deficiency
Interventions: Tri-Vi-Sol; Dietary Supplement
Lead sponsor: Baylor College of Medicine; Other
Eligibility: Up to 2 Hours
Enrollment: 80 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2011
U.S. locations: 3
States / cities: Houston, Texas

Conditions: Healthy
Interventions: Nicotinamide, Lanthanum Carbonate, Lanthanum Carbonate Placebo, Nicotinamide Placebo; Drug
Lead sponsor: Northwestern University; Other
Eligibility: 18 Years to 60 Years
Enrollment: 39 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016 – 2017
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Vitamin D Insufficiency, Vitamin D Deficiency
Interventions: Pharmacist Education about Vitamin D; Behavioral
Lead sponsor: University of Colorado, Denver; Other
Eligibility: 65 Years to 89 Years
Enrollment: 80 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2005 – 2006
U.S. locations: 1
States / cities: Aurora, Colorado

Conditions: Vitamin D Deficiency, Falls
Interventions: 200 IU/d cholecalciferol, 1000 IU/d cholecalciferol, 2000 IU/d cholecalciferol, 4000 IU/d cholecalciferol; Dietary Supplement
Lead sponsor: Johns Hopkins University; Other
Eligibility: 70 Years and older
Enrollment: 688 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2019
U.S. locations: 2
States / cities: Baltimore, Maryland • Hagerstown, Maryland

Conditions: Hypovitaminosis D
Interventions: Vitamin D, Placebo; Dietary Supplement
Lead sponsor: Wake Forest University Health Sciences; Other
Eligibility: 18 Years and older
Enrollment: 113 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2017
U.S. locations: 1
States / cities: Charlotte, North Carolina

Conditions: Ulcerative Colitis
Interventions: Nutrition supplement, Placebo supplement; Dietary Supplement
Lead sponsor: Baptist Memorial Health Care Corporation; Other
Eligibility: 18 Years and older
Enrollment: 30 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018
U.S. locations: 1
States / cities: Memphis, Tennessee

Conditions: Thalassemia Major
Interventions: Vitamin D3, Placebo; Drug
Lead sponsor: Weill Medical College of Cornell University; Other
Eligibility: 6 Years to 60 Years
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 1
States / cities: New York, New York

Conditions: Transplant; Failure, Kidney, Renal Disease, End Stage, Hyperparathyroidism, Secondary
Interventions: Paricalcitol, Corticosteroid Avoidance Immune Suppression Protocol; Drug · Other
Lead sponsor: Mayo Clinic; Other
Eligibility: 18 Years and older
Enrollment: 100 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2011
U.S. locations: 2
States / cities: Scottsdale, Arizona • Rochester, Minnesota

Conditions: Type 1 Diabetes
Interventions: Autologous UCB, Omega 3 FA, Vitamin D; Biological · Dietary Supplement
Lead sponsor: University of Florida; Other
Eligibility: 1 Year to 18 Years
Enrollment: 15 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Gainesville, Florida

Conditions: Osteoporosis
Interventions: Teriparatide, Alendronate, Calcium, Vitamin D, Placebo-Oral, Placebo-SC; Drug · Dietary Supplement
Lead sponsor: Eli Lilly and Company; Industry
Eligibility: 45 Years to 85 Years · Female only
Enrollment: 203 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2001 – 2003
U.S. locations: 15
States / cities: Mobile, Alabama • Tustin, California • Lakewood, Colorado + 12 more

Conditions: Anal Dysplasia, Carcinoma in Situ
Interventions: Gliolan, Vitamin D3 cholecalciferol), Photodynamic Therpay; Drug · Other
Lead sponsor: Abramson Cancer Center at Penn Medicine; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2019 – 2022
U.S. locations: 1
States / cities: Philadelphia, Pennsylvania

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

Conditions: Pre-diabetes
Interventions: vitamin D, placebo; Drug
Lead sponsor: Charles Drew University of Medicine and Science; Other
Eligibility: 18 Years to 90 Years
Enrollment: 117 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Los Angeles, California

Conditions: Chronic Kidney Disease (CKD), End-stage Renal Disease (ESRD)
Interventions: Cholecalciferol - CKD, Calcitriol - CKD, Cholecalciferol - non-CKD; Drug · Device
Lead sponsor: University of Kansas Medical Center; Other
Eligibility: 21 Years to 90 Years
Enrollment: 56 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2012
U.S. locations: 1
States / cities: Kansas City, Kansas

Conditions: Vitamin D Deficiency, Vitamin D Insufficiency, Healthy Volunteers
Interventions: ALPCO 25(OH) Vitamin D CLIA Kit; Device
Lead sponsor: American Laboratory Products Company; Industry
Eligibility: 22 Years and older
Enrollment: 80 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2026
U.S. locations: 1
States / cities: Salem, New Hampshire

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The Effect of Weight on Vitamin D Dose Response

Vitamin D Deficiency and Atopic Dermatitis

Vitamin D Supplementation for Adults With Neurofibromatosis Type 1 (NF1)

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

Effects of Swallowed Steroids on Bone Density and Growth in Pediatric Eosinophilic Esophagitis

DN-101 in Combination With Docetaxel in Androgen-Independent Prostate Cancer (AIPC) (AIPC Study of Calcitriol Enhancing Taxotere [ASCENT-2])

Age Related Changes in Calciotropic Hormones and Their Impact on Male Osteoporosis

Calcium and Vitamin D Supplementation Decreases Incidence of Stress Fractures in Female Navy Recruits

Pediatric Safety Follow-up Study of Prior Treatment With Romosozumab for Osteogenesis Imperfecta

Impact of Vitamin D Status on Bones in Breastfed Infants

Healthy Combine Study

Vitamin D Levels and Vitamin D Education in Geriatric Patients

Study To Understand Fall Reduction and Vitamin D in You

The Effect of Hypovitaminosis D and Vitamin D Supplementation on Fracture Nonunion Rates

Immunonutrition in Ulcerative Colitis

The Effect of Vitamin D Supplementation on Calcium Excretion in Thalassemia: a Dose Response Study

Oral Paricalcitol in Kidney Transplant Recipients

Cord Blood Plus Vitamin D and Omega 3s in T1D

The Forteo Alendronate Comparator Trial

PDT Plus Vitamin D3 for Anal Dysplasia

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

Vitamin D in Minorities With Prediabetes

Impact of Vitamin D Therapies on Chronic Kidney Disease

ALPCO 25(OH) Vitamin D CLIA Kit - Fresh Versus Frozen Serum and Plasma Stability Study