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ClinicalTrials.gov public records Last synced Nov 15, 2026, 8:09 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 313–336 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Osteoporosis, Postmenopausal
Interventions: Hesperidin and Calcilock, Hesperidin, Control; Dietary Supplement
Lead sponsor: Purdue University; Other
Eligibility: Female only
Enrollment: 12 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2011 – 2012
U.S. locations: 1
States / cities: West Lafayette, Indiana

Conditions: Type 2 Diabetes
Interventions: Dietary Intervention Meetings; Behavioral
Lead sponsor: University of South Carolina; Other
Eligibility: 18 Years to 65 Years
Enrollment: 63 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2021 – 2025
U.S. locations: 1
States / cities: Columbia, South Carolina

Conditions: Adiposity
Interventions: Vitamin D3 (cholecalciferol), 2000 IU per day, omega-3 fatty acids (fish oil); Dietary Supplement · Drug
Lead sponsor: Brigham and Women's Hospital; Other
Eligibility: 50 Years and older
Enrollment: 600 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2022
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Hypovitaminosis D, Spinal Disease, Osteoporosis
Interventions: Not listed
Lead sponsor: OSF Healthcare System; Other
Eligibility: 50 Years and older
Enrollment: 460 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: Started 2015
U.S. locations: 1
States / cities: Peoria, Illinois

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions: CTAP101 Capsules, CTAP101 Injection; Drug
Lead sponsor: OPKO IP Holdings II, Inc.; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 28 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009
U.S. locations: 12
States / cities: Peoria, Arizona • Evergreen Park, Illinois • Springfield, Massachusetts + 9 more

Conditions: Hypovitaminosis D, Hypovitaminosis
Interventions: Vitamin Arm 1, Vitamin Arm 2, Vitamin Arm 3, Placebo; Dietary Supplement · Other
Lead sponsor: Madigan Army Medical Center; Federal
Eligibility: 18 Years to 69 Years
Enrollment: 96 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2025 – 2026
U.S. locations: 1
States / cities: Tacoma, Washington

Conditions: Femoral Neck Fractures
Interventions: Sliding Hip Screw, Cancellous Screws, Vitamin D, Vitamin D Placebo; Procedure · Drug
Lead sponsor: McMaster University; Other
Eligibility: 18 Years to 60 Years
Enrollment: 91 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2019
U.S. locations: 10
States / cities: Phoenix, Arizona • San Francisco, California • Gainesville, Florida + 7 more

Conditions: Cancer
Interventions: Vitamin D3, Calcium carbonate; Dietary Supplement
Lead sponsor: Creighton University; Other
Eligibility: 55 Years and older · Female only
Enrollment: 2,303 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2015
U.S. locations: 1
States / cities: Fremont, Nebraska

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

Conditions: Pancreatic Cancer, Pancreas Adenocarcinoma, Advanced Pancreatic Cancer, Metastatic Pancreatic Cancer, Metastatic Pancreatic Adenocarcinoma
Interventions: Pembrolizumab, paricalcitol, placebo; Drug
Lead sponsor: Translational Genomics Research Institute; Other
Eligibility: 18 Years and older
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2020
U.S. locations: 6
States / cities: Scottsdale, Arizona • Duarte, California • Westwood, Kansas + 3 more

Conditions: Hypocalcemia
Interventions: Teriparatide (Forteo), Calcium, Calcitriol; Drug
Lead sponsor: M.D. Anderson Cancer Center; Other
Eligibility: 18 Years and older
Enrollment: 7 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2010
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Foot Injuries and Disorders
Interventions: NutraHeal, NutraHeal Plus; Dietary Supplement
Lead sponsor: NutraHeal; Industry
Eligibility: 20 Years to 80 Years
Enrollment: 46 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2022 – 2023
U.S. locations: 3
States / cities: Altoona, Pennsylvania • Ebensburg, Pennsylvania • State College, Pennsylvania

Conditions: Leukemia, Myelodysplastic Syndromes, Myelodysplastic/Myeloproliferative Neoplasms
Interventions: cholecalciferol; Dietary Supplement
Lead sponsor: Wake Forest University Health Sciences; Other
Eligibility: Up to 120 Years
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2006
U.S. locations: 1
States / cities: Winston-Salem, North Carolina

Conditions: Fracture
Interventions: Vitamin D3, Placebo; Drug · Other
Lead sponsor: University of Maryland, Baltimore; Other
Eligibility: 18 Years to 50 Years
Enrollment: 102 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2021
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Vitamin D Deficiency
Interventions: Vitamin D, 25(OH)D3; Drug
Lead sponsor: University of California, Los Angeles; Other
Eligibility: 18 Years and older
Enrollment: 35 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2019
U.S. locations: 2
States / cities: Los Angeles, California

Conditions: Immunosenescence, Shingles
Interventions: Varicella Zoster Virus Vaccine (Zostavax); Biological
Lead sponsor: University of Colorado, Denver; Other
Eligibility: 60 Years and older
Enrollment: 33 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2014
U.S. locations: 1
States / cities: Aurora, Colorado

Conditions: Vitamin D Deficiency
Interventions: Vitamin D, Placebo, Vitamin D + L-cysteine, L-cysteine; Drug
Lead sponsor: Louisiana State University Health Sciences Center Shreveport; Other
Eligibility: 18 Years to 65 Years
Enrollment: 165 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2020 – 2022
U.S. locations: 1
States / cities: Shreveport, Louisiana

Conditions: Vitamin D Deficiency
Interventions: 800 IU Vitamin D, Placebo; Dietary Supplement
Lead sponsor: Milton S. Hershey Medical Center; Other
Eligibility: 18 Years to 35 Years
Enrollment: 412 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2013 – 2019
U.S. locations: 1
States / cities: University Park, Pennsylvania

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

Conditions: Kidney Stones, Nephrolithiasis
Interventions: Empiric Therapy: Diet, Empiric Therapy: Drug, Selective Therapy: Diet, Selective Therapy: Drug; Behavioral · Drug
Lead sponsor: Vanderbilt University Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 56 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2022 – 2026
U.S. locations: 1
States / cities: Nashville, Tennessee

Conditions: Urinary Incontinence, Vitamin D Deficiency
Interventions: Vitamin D3 50,000 IU, Placebo; Dietary Supplement · Other
Lead sponsor: University of Alabama at Birmingham; Other
Eligibility: 50 Years and older · Female only
Enrollment: 243 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2017
U.S. locations: 1
States / cities: Birmingham, Alabama

Conditions: Premenstrual Syndrome, Menstrual Pain
Interventions: DITTO Cycle Supplement; Dietary Supplement
Lead sponsor: Muse Nutrition Ltd; Industry
Eligibility: 18 Years to 45 Years · Female only
Enrollment: 40 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2025
U.S. locations: 1
States / cities: Las Vegas, Nevada

Conditions: Chronic Kidney Disease, Hyperparathyroidism, Secondary, Vitamin D Deficiency
Interventions: CTAP101 30 μg capsules, Sugar pill to CTAP101 30 μg capsules; Drug · Other
Lead sponsor: OPKO IP Holdings II, Inc.; Industry
Eligibility: 18 Years and older
Enrollment: 213 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2014
U.S. locations: 1
States / cities: Bannockburn, Illinois

Conditions: T Cell Response to Dried Plum, Vitamin D Influence on Immune Response, Dried Plum and Immune Function
Interventions: Dried plums; Dietary Supplement
Lead sponsor: Indiana University; Other
Eligibility: 60 Years to 75 Years · Female only
Enrollment: 30 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2025 – 2028
U.S. locations: 1
States / cities: Indianapolis, Indiana

Search by objective public record fields.

Hesperidin and Bone Health in Postmenopausal Women

The Dietary Guidelines 3 Diets Study

Vitamin D and Omega-3 Adiposity Trial (VITAL Adiposity)

Analysis of Hypovitaminosis D and Osteopenia/Osteoporosis in Spinal Disease Patients Who Underwent a Spinal Fusion at Illinois Neurological Institute, Peoria, IL., a Retrospective Review From November 1, 2012 to October 31, 2014 and Prospective Pilot From July 1, 2015-June 30, 2016

Pharmacokinetics and Safety Pilot Study of Single-Dose Oral and Intravenous CTAP101 in Stage 3 and 4 Chronic Kidney Disease Subjects

Evaluating Response to Vitamin D3 and K2 Supplementation in Healthcare Personnel

Fixation Using Alternative Implants for the Treatment of Hip Fractures (FAITH-2)

Clinical Trial of Vitamin D3 to Reduce Cancer Risk in Postmenopausal Women

Vitamin D Supplementation in Multiple Sclerosis

A SU2C Catalyst® Trial of a PD1 Inhibitor With or Without a Vitamin D Analog for the Maintenance of Pancreatic Cancer

Teriparatide (Forteo) in the Treatment of Patients With Postoperative Hypocalcemia

Nutritional Supplements and Foot Surgery

Cholecalciferol in Treating Patients With Myelodysplastic Syndrome

Optimal Vitamin D3 Supplementation Strategies for Acute Fracture Healing

Effects of Vitamin D3 Versus 25OHD3 on Mineral Metabolism and Immune Function

Vitamin D Supplementation And Varicella Zoster Virus Vaccine Responsiveness In Older Long-Term Care Residents

Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

Genetic, Dietary and Environmental Influences on Vitamin D Metabolism

Studies With 1,25-Dihydroxycholecalciferol

Empiric Versus Selective Prevention Strategies for Kidney Stone Disease

Vitamin D Supplementation in Older Adults With Urinary Incontinence

A Clinical Study to Assess the Effect of a Dietary Supplement on Menstrual Cycle Symptoms

Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency

Prebiotics (Dried Plum) and Immune Function in Postmenopausal Women