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ClinicalTrials.gov public records Last synced Nov 11, 2026, 5:25 PM 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 1–24 of 99 matching trials from the live ClinicalTrials.gov search.

Filters: Condition: Vitamin D Insufficiency Clear all

Conditions: Healthy
Interventions: Vitamin D3 1000 IU, Placebo Tablet; Dietary Supplement
Lead sponsor: University of Pittsburgh; Other
Eligibility: 8 Years to 14 Years
Enrollment: 157 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2008 – 2011
U.S. locations: 1
States / cities: Pittsburgh, Pennsylvania

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

Conditions: Chronic Kidney Disease, Vitamin D Deficiency, Coronary Calcification, Disorders of Calcium and Bone Metabolism
Interventions: Calcitriol (Rocaltrol®), Paricalcitol; Drug
Lead sponsor: Joslin Diabetes Center; Other
Eligibility: 25 Years and older
Enrollment: 44 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2013
U.S. locations: 1
States / cities: Philadelphia, Pennsylvania

Conditions: Chronic Kidney Disease, Anemia of Chronic Disease
Interventions: Oral Calcitriol 0.5 mcg once daily for 6 weeks, Placebo; Drug
Lead sponsor: University of Alabama at Birmingham; Other
Eligibility: 19 Years and older
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2015
U.S. locations: 1
States / cities: Birmingham, Alabama

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism, Hemodialysis
Interventions: Paricalcitol, Cinacalcet; Drug
Lead sponsor: Abbott; Industry
Eligibility: 18 Years and older
Enrollment: 272 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 30
States / cities: Tempe, Arizona • Chula Vista, California • Los Angeles, California + 22 more

Conditions: End Stage Renal Disease
Interventions: paricalcitol, cinacalcet; Other
Lead sponsor: Vanderbilt University; Other
Eligibility: 18 Years and older
Enrollment: 12 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2010
U.S. locations: 1
States / cities: Nashville, Tennessee

Conditions: Chronic Kidney Disease
Interventions: Paricalcitol, Placebo; Drug
Lead sponsor: University of Washington; Other
Eligibility: 18 Years and older
Enrollment: 22 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Seattle, Washington

Conditions: Iron Deficiency, Iron Deficiency Anemia (IDA), Vitamin D Deficiency, Vitamin D Insufficiency, Low Energy Availability, Bone Density
Interventions: Iron and Vitamin D Deficiencies Correction; Dietary Supplement
Lead sponsor: Morehouse School of Medicine; Other
Eligibility: 18 Years and older
Enrollment: 36 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2024 – 2026
U.S. locations: 1
States / cities: Atlanta, Georgia

Conditions: Sarcoidosis, Vitamin D Insufficiency
Interventions: Ergocalciferol, Placebo, Calcium Citrate with Vitamin D2; Drug
Lead sponsor: University of Texas Southwestern Medical Center; Other
Eligibility: 21 Years and older
Enrollment: 90 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2026
U.S. locations: 1
States / cities: Dallas, Texas

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism, Vitamin D Insufficiency
Interventions: Cohort 1 CTAP101 Capsules- 60µg, Cohort 1 CTAP101 Capsules - 90µg, Cohort 1 Matching Sugar Capsule, Cohort 2 CTAP101 Capsules - 30µg, Cohort 2 Matching Sugar Capsule; Drug
Lead sponsor: OPKO Health, Inc.; Industry
Eligibility: 18 Years to 85 Years
Enrollment: 78 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Bannockburn, Illinois

Conditions: Chronic Kidney Disease Stage 3 and 4
Interventions: Ergocalciferol, Cholecalciferol; Drug
Lead sponsor: The Cleveland Clinic; Other
Eligibility: 18 Years to 99 Years
Enrollment: 19 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Cleveland, Ohio

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

Conditions: Cardiovascular Disease, Chronic Kidney Disease, Diabetes, Vitamin D Deficiency, Hyperparathyroidism
Interventions: Not listed
Lead sponsor: University of Nebraska; Other
Eligibility: 19 Years and older
Enrollment: 338 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2023
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Chronic Kidney Disease
Interventions: Vitamin D2 (ergocalciferol), Vitamin D3 (cholecalciferol); Dietary Supplement
Lead sponsor: University of Kansas Medical Center; Other
Eligibility: 18 Years and older
Enrollment: 44 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2015
U.S. locations: 1
States / cities: Kansas City, Kansas

Conditions: CKD, Chronic Kidney Diseases, Hepcidin, Ergocalciferol, Vitamin D, Iron-deficiency, Anemia
Interventions: Ergocalciferol 50000 UNT, Placebo; Drug
Lead sponsor: University of Alabama at Birmingham; Other
Eligibility: 19 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2018
U.S. locations: 1
States / cities: Birmingham, Alabama

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions: CTAP201 Injection, Doxercalciferol; Drug
Lead sponsor: OPKO IP Holdings II, Inc.; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 24 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2009
U.S. locations: 6
States / cities: Peoria, Arizona • Springfield, Massachusetts • Cincinnati, Ohio + 3 more

Conditions: Diabetes Mellitus, Chronic Kidney Disease, Diabetic Kidney Disease
Interventions: Cholecalciferol, Placebo; Dietary Supplement
Lead sponsor: University of Washington; Other
Eligibility: 18 Years and older
Enrollment: 22 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2010
U.S. locations: 1
States / cities: Seattle, Washington

Conditions: Vitamin D Deficiency, Accidental Falls
Interventions: Vitamin D3, Vitamin E; Dietary Supplement
Lead sponsor: Wake Forest University Health Sciences; Other
Eligibility: 65 Years and older
Enrollment: 68 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Winston-Salem, North Carolina

Conditions: Vitamin D Deficiency, End Stage Renal Disease
Interventions: Not listed
Lead sponsor: Winthrop University Hospital; Other
Eligibility: 18 Years to 85 Years
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2012
U.S. locations: 2
States / cities: Mineola, New York

Conditions: Chronic Kidney Disease
Interventions: D6-25-hydroxyvitamin D3; Drug
Lead sponsor: University of Washington; Other
Eligibility: 18 Years and older
Enrollment: 88 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2021
U.S. locations: 1
States / cities: Seattle, Washington

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions: CTA018 Injection; Drug
Lead sponsor: OPKO IP Holdings II, Inc.; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 41 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2008 – 2010
U.S. locations: 5
States / cities: Pembroke Pines, Florida • Meridian, Idaho • Springfield, Massachusetts + 2 more

Conditions: Respiratory Failure
Interventions: Enteral Vitamin D3 50,000 IU, Enteral Vitamin D3 100,000IU, Inactive substance; Drug · Other
Lead sponsor: Emory University; Other
Eligibility: 18 Years and older
Enrollment: 31 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 2
States / cities: Atlanta, Georgia

Conditions: Healthy Adult Participants, Vitamin D Insufficiency
Interventions: Vitamin D3 bioenhanced eggs, 25(OH)D3 bioenhanced eggs; Dietary Supplement
Lead sponsor: Cornell University; Other
Eligibility: 18 Years to 40 Years
Enrollment: 60 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2027 – 2029
U.S. locations: 1
States / cities: Ithaca, New York

Conditions: Coronary Artery Disease, Chronic Kidney Disease, Hypovitaminosis D, Secondary Hyperparathyroidism
Interventions: paricalcitol, placebo; Drug
Lead sponsor: Thomas Jefferson University; Other
Eligibility: 18 Years and older
Enrollment: 10 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Philadelphia, Pennsylvania

Search by objective public record fields.

Defining Vitamin D Insufficiency in School Age Children: A Randomized Placebo Controlled Trial of Vitamin D3

Activated Vitamin D for the Prevention and Treatment of Acute Kidney Injury

Vitamin D and Coronary Calcification Study

Effects of Vitamin D Replacement on Hormones Regulating Iron Metabolism in Individuals With Chronic Kidney Disease

Evaluation of the Effectiveness of Paricalcitol Versus Cinacalcet With Low-Dose Vitamin D

Vitamin D, Insulin Resistance and Inflammation in ESRD

Metabolic Effects of Paricalcitol

Collegiate Athlete Study

Vitamin D Homeostasis in Sarcoidosis

Safety/Efficacy Study of CTAP101 in Chronic Kidney Disease Subjects With Secondary Hyperparathyroidism (SHPT)

Vitamin D Supplement Study for Stage Three and Four Chronic Kidney Disease (CKD) Patients

Vitamin D and Bone Homeostasis in Ortho Polytrauma Patients

Vascular Risk After Kidney Transplantation

Differential Effects of Ergocalciferol and Cholecalciferol Therapies in Chronic Kidney Disease

Effect of Ergocalciferol on Iron Metabolism in Individuals With Chronic Kidney Disease

Comparison of I.V. CTAP201 and Doxercalciferol (Hectorol) in Subjects With Chronic Kidney Disease (CKD) and Secondary Hyperparathyroidism (SHPT)

Randomized Controlled Trial of Vitamin D3 in Diabetic Kidney Disease

Improving Vitamin D Status in Home-bound Elders

A Study of 25-hydroxy Vitamin d Levels in Non-itching Hemodialysis Patients

Clearance of 25-hydroxyvitamin D in Chronic Kidney Disease

Safety Study of CTA018 Injection to Treat Stage 5 Chronic Kidney Disease

Vitamin D in Ventilated ICU Patients

Supplementation of Cholecalciferol and Related Active Metabolites Through Bioenhancing Layer's Eggs

Effect of Vitamin D Supplement on Inflammation Markers in High-Risk Cardiovascular Patients With Chronic Kidney Disease