Search | Clinical Trials Finder

These results were retrieved from the live ClinicalTrials.gov registry. Filters and sort order apply to this result list.

ClinicalTrials.gov public records Last synced Nov 15, 2026, 7:46 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 265–288 of 967 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Vitamin D3 . Clear all

Conditions: Tonsillitis
Interventions: Not listed
Lead sponsor: University of Chicago; Other
Eligibility: 1 Year to 12 Years
Enrollment: 60 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Menopause
Interventions: Egg consumption, Control; Behavioral
Lead sponsor: Purdue University; Other
Eligibility: 19 Years and older · Female only
Enrollment: 20 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2015 – 2017
U.S. locations: 1
States / cities: West Lafayette, Indiana

Conditions: Covid19, COVID-19 Pneumonia, COVID-19 Respiratory Infection, COVID-19 Acute Bronchitis
Interventions: Ivermectin; Drug
Lead sponsor: Patrick Robinson; Other
Eligibility: 12 Years to 110 Years
Enrollment: 1,000 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2022 – 2024
U.S. locations: 1
States / cities: San Antonio, Florida

Conditions: Osteoporosis, Osteopenia
Interventions: Alendronate, Calcium Citrate, Vitamin D; Drug · Dietary Supplement
Lead sponsor: University of Chicago; Other
Eligibility: 59 Years and older · Female only
Enrollment: 36 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2001 – 2009
U.S. locations: 1
States / cities: Chicago, Illinois

Conditions: Schizophrenia, Metabolic Syndrome, Vitamin D Deficiency
Interventions: Blood Draw; Other
Lead sponsor: Creighton University; Other
Eligibility: 21 Years to 65 Years
Enrollment: 20 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2014 – 2015
U.S. locations: 1
States / cities: Omaha, Nebraska

Conditions: Hypertension, Vitamin D Deficiency
Interventions: calcitriol, Placebo; Drug
Lead sponsor: University of Utah; Other
Eligibility: 55 Years and older
Enrollment: 12 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2008
U.S. locations: 1
States / cities: Salt Lake City, Utah

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

Conditions: Low 25-hydroxyvitamin D Concentrations
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Wake Forest University Health Sciences; Other
Eligibility: 65 Years to 89 Years
Enrollment: 15 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2017
U.S. locations: 1
States / cities: Winston-Salem, North Carolina

Conditions: Vitamin D Deficiency, Obesity, Insulin Resistance
Interventions: Not listed
Lead sponsor: University of Alabama at Birmingham; Other
Eligibility: 10 Years to 18 Years · Female only
Enrollment: 114 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2010
U.S. locations: 1
States / cities: Birmingham, Alabama

Conditions: COVID-19, Coronavirus, SARS-CoV2 Infection
Interventions: Rayaldee, Placebo; Drug
Lead sponsor: OPKO Health, Inc.; Industry
Eligibility: 18 Years and older
Enrollment: 171 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2020 – 2021
U.S. locations: 10
States / cities: San Francisco, California • Miami, Florida • Evanston, Illinois + 6 more

Conditions: Prostate Adenocarcinoma, Stage I Prostate Cancer, Stage IIA Prostate Cancer, Stage IIB Prostate Cancer
Interventions: Cholecalciferol, Genistein, Laboratory Biomarker Analysis, Pharmacological Study, Placebo; Drug · Other
Lead sponsor: National Cancer Institute (NCI); NIH
Eligibility: 18 Years and older · Male only
Enrollment: 15 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2014
U.S. locations: 11
States / cities: Birmingham, Alabama • Baltimore, Maryland • Burlington, Massachusetts + 6 more

Conditions: Asthma, Allergy
Interventions: Not listed
Lead sponsor: Robert J. Freishtat; Other
Eligibility: 6 Years to 20 Years
Enrollment: 273 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2012 – 2018
U.S. locations: 1
States / cities: Washington D.C., District of Columbia

Conditions: Osteoporosis
Interventions: Zoledronic Acid, Placebo; Drug
Lead sponsor: Novartis; Industry
Eligibility: 68 Years to 90 Years · Female only
Enrollment: 2,456 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2005 – 2009
U.S. locations: 30
States / cities: Tucson, Arizona • Little Rock, Arkansas • Beverly Hills, California + 26 more

Conditions: Hypocalcemia, Pseudohypoparathyroidism, Osteomalacia, Rickets, Pseudopseudohpoparathyroidism
Interventions: Not listed
Lead sponsor: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK); NIH
Eligibility: 2 Months to 100 Years
Enrollment: 70 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 1997 – 2022
U.S. locations: 1
States / cities: Bethesda, Maryland

Conditions: Chronic Plaque Psoriasis
Interventions: Calcitriol 3mcg/g; Drug
Lead sponsor: Galderma R&D; Industry
Eligibility: 12 Years to 17 Years
Enrollment: 25 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2009
U.S. locations: 5
States / cities: Little Rock, Arkansas • San Diego, California • Eagan, Minnesota + 2 more

Conditions: Multiple Sclerosis, Relapsing-remitting
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Johns Hopkins University; Other
Eligibility: 18 Years to 60 Years · Female only
Enrollment: 57 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2014
U.S. locations: 2
States / cities: San Francisco, California • Baltimore, Maryland

Conditions: Secondary Hyperparathyroidism, End-Stage Renal Disease
Interventions: Paricalcitol, Calcitriol; Drug
Lead sponsor: AbbVie (prior sponsor, Abbott); Industry
Eligibility: Up to 16 Years
Enrollment: 61 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2012
U.S. locations: 18
States / cities: Birmingham, Alabama • Gainesville, Florida • Orlando, Florida + 15 more

Conditions: Vitamin d Deficiency
Interventions: Blood draw pre-operatively, Blood draw post-operative Day 1, Blood draw post-operative Day 2; Procedure
Lead sponsor: University of Missouri, Kansas City; Other
Eligibility: 18 Years and older
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016
U.S. locations: 1
States / cities: Kansas City, Missouri

Conditions: Stage IV Colon Cancer, Stage IV Rectal Cancer
Interventions: leucovorin calcium, bevacizumab, cholecalciferol, fluorouracil, oxaliplatin, pharmacological study; Drug · Biological · Dietary Supplement + 1 more
Lead sponsor: Roswell Park Cancer Institute; Other
Eligibility: 18 Years to 79 Years
Enrollment: 10 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2012
U.S. locations: 1
States / cities: Buffalo, New York

Conditions: Breast Cancer
Interventions: Cholecalciferol; Drug
Lead sponsor: Inova Health Care Services; Other
Eligibility: 18 Years and older · Female only
Enrollment: 8 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2019
U.S. locations: 1
States / cities: Fairfax, Virginia

Conditions: Renal Dialysis, Vitamin D Deficiency
Interventions: Cholecalciferol (Vitamin D); Dietary Supplement
Lead sponsor: VA Office of Research and Development; Federal
Eligibility: 45 Years to 89 Years
Enrollment: 20 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2011 – 2022
U.S. locations: 1
States / cities: The Bronx, New York

Conditions: Vitamin D Deficiency
Interventions: Vitamin D drops, 200 or 400 or 600 IU/day or 800 IU/day; Dietary Supplement
Lead sponsor: Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD); NIH
Eligibility: 3 Weeks to 5 Weeks
Enrollment: 398 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2006 – 2011
U.S. locations: 1
States / cities: Coralville, Iowa

Conditions: Epilepsy, Magnesium Deficiency, Vitamin D Deficiency
Interventions: No Intervention. Study is Cross Sectional in nature; Other
Lead sponsor: Drexel University; Other
Eligibility: 18 Years to 70 Years
Enrollment: 7 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2015 – 2019
U.S. locations: 2
States / cities: Philadelphia, Pennsylvania

Conditions: Obesity
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Mayo Clinic; Other
Eligibility: 12 Years to 18 Years
Enrollment: 51 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2012
U.S. locations: 1
States / cities: Rochester, Minnesota

Search by objective public record fields.

Vitamin D Levels in Children Undergoing Adenotonsillectomies and Controls

Impact of Egg Consumption on Carotenoid and Vitamin D Bioavailability in Pre- and Post-menopausal Women

Observational Study on the Use of Ivermectin as an Outpatient Treatment Option for COVID-19

Texture Analysis for Postmenopausal Osteoporosis

The Influence of Vitamin D on Atypical Antipsychotic-induced Weight Gain

Effects of Vitamin D on Renin Expression in Hypertensive Patients

Calcitriol in Preventing Prostate Cancer in Patients With Prostatic Intraepithelial Neoplasia

A Pilot Study to Examine the Effects of Vitamin D Supplementation on Mitochondrial Bioenergetics in Older Adults

Vitamin D Deficiency in Obese Adolescent Girls and Influence of Vitamin D on Insulin Secretion and Sensitivity

Safety and Efficacy of Rayaldee for Treating Mild to Moderate COVID-19

Cholecalciferol and Genistein Before Surgery in Treating Patients With Early Stage Prostate Cancer

Vitamin D, Steroids, and Asthma in African American Youth

Double-blind Extension of HORIZON Pivotal Fracture Trial (Zoledronic Acid in the Treatment of Postmenopausal Osteoporosis)

Studies of States With Resistance to Vitamin D and Parathyroid Hormone

A Study of Calcitriol BID Topical Treatment in Adolescents With Plaque Psoriasis

Pharmacokinetics of Vitamin D in Multiple Sclerosis and in Health

Study to Evaluate Safety of Vitamin D Receptor Activators in Patients Ages 0 to 16 With Chronic Kidney Disease Stage 5 Receiving Peritoneal Dialysis Within Current Clinical Practice

Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.

High-Dose Cholecalciferol in Treating Patients Receiving Combination Chemotherapy and Bevacizumab as First-Line Therapy For Metastatic Colorectal Cancer

Vitamin D Supplementation in Women With DCIS and/or LCIS

Vitamin D Supplementation in Kidney Disease

Prevention of Vitamin D Deficiency

Magnesium as a Mediator of Bone and Vitamin D Metabolism in Patients on Antiepileptic Drug Therapy

Effect of Vitamin D3 Supplementation on Insulin Resistance and Cardiovascular Risk Factors in Obese Adolescents