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ClinicalTrials.gov public records Last synced Nov 15, 2026, 7:43 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 1–24 of 30 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Liquid Vitamin D Clear all

Conditions: Endometriosis
Interventions: Vitamin D3, Fish Oil, Placebo; Dietary Supplement · Other
Lead sponsor: Boston Children's Hospital; Other
Eligibility: 12 Years to 25 Years · Female only
Enrollment: 69 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2016
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Anemia of Chronic Kidney Disease
Interventions: Cholecalciferol; Drug
Lead sponsor: Johns Hopkins University; Other
Eligibility: 1 Year to 21 Years
Enrollment: 34 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2015
U.S. locations: 1
States / cities: Baltimore, Maryland

Conditions: Hypertension, Vitamin D Deficiency, Pre-Hypertension
Interventions: Cholecalciferol; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years to 50 Years
Enrollment: 534 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2010 – 2013
U.S. locations: 3
States / cities: Hartford, Connecticut • Boston, Massachusetts • Minneapolis, Minnesota

Conditions: Knee Osteoarthritis
Interventions: Stem Cell Support Formula, Placebo; Dietary Supplement
Lead sponsor: Regenexx, LLC; Industry
Eligibility: 18 Years to 80 Years
Enrollment: 80 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2021 – 2022
U.S. locations: 2
States / cities: Broomfield, Colorado • Lone Tree, Colorado

Conditions: HIV Infections, AIDS
Interventions: Cholecalciferol (Vit D3); Drug
Lead sponsor: Children's Hospital of Philadelphia; Other
Eligibility: 5 Years to 24 Years
Enrollment: 44 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2011
U.S. locations: 1
States / cities: Philadelphia, Pennsylvania

Conditions: Chronic Kidney Disease, Secondary Hyperparathyroidism
Interventions: Cinacalcet HCl, Standard of Care; Drug · Dietary Supplement
Lead sponsor: Amgen; Industry
Eligibility: 6 Years to 17 Years
Enrollment: 55 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2014 – 2016
U.S. locations: 26
States / cities: Los Angeles, California • Wilmington, Delaware • Atlanta, Georgia + 22 more

Conditions: Weight Loss, Starvation
Interventions: Caloric Restriction, Protein, Exercise, Calcium and Vitamin D, Maltodextrin; Other · Dietary Supplement
Lead sponsor: University of Nebraska Lincoln; Other
Eligibility: 19 Years to 30 Years · Male only
Enrollment: 20 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016 – 2019
U.S. locations: 1
States / cities: Lincoln, Nebraska

Conditions: Obesity, Rhinitis, Rhinitis, Allergic, Respiratory Sounds, Dyspnea, Headache, Migraine Disorders, Arthritis, Arthralgia, Anxiety, Sleep Initiation and Maintenance Disorders, Sleep Deprivation
Interventions: Vitamin A, Vitamin B6, Vitamin C, Nicotinamide, Vitamin D3, Vitamin E, Broccoli, Spinach, Caffeine, Coffee, Axon Eyewear, Chocolate; Dietary Supplement · Other · Device
Lead sponsor: Verifomics LLC; Industry
Eligibility: 18 Years and older
Enrollment: 16 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2016
U.S. locations: 1
States / cities: Dallas, Texas

Conditions: Autism, Vitamin D Deficiency
Interventions: Liquid Vitamin D; Drug
Lead sponsor: University of California, San Francisco; Other
Eligibility: 3 Years to 8 Years
Enrollment: 10 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2015
U.S. locations: 1
States / cities: San Francisco, California

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: 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: 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: 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: 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: Lipid Metabolism Disorders
Interventions: High fat liquid shake; Dietary Supplement
Lead sponsor: National Heart, Lung, and Blood Institute (NHLBI); NIH
Eligibility: 18 Years to 65 Years
Enrollment: 48 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2026 – 2029
U.S. locations: 1
States / cities: Bethesda, Maryland

Conditions: Prediabetes, Type 2 Diabetes (T2DM)
Interventions: Vitamin D (Cholecalciferol ), Placebo; Drug
Lead sponsor: Tufts Medical Center; Other
Eligibility: 30 Years to 74 Years
Enrollment: 100 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2026 – 2031
U.S. locations: 1
States / cities: Boston, Massachusetts

Conditions: Obesity, Pediatric, Obesity, Childhood, Obesity, Morbid, Vitamin D Deficiency
Interventions: Vitamin D3; Dietary Supplement
Lead sponsor: Columbia University; Other
Eligibility: 5 Years to 11 Years
Enrollment: 6 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2016 – 2019
U.S. locations: 1
States / cities: New York, New York

Conditions: Mineral Absorption
Interventions: Vitamin D; Dietary Supplement
Lead sponsor: Baylor College of Medicine; Other
Eligibility: 4 Years to 8 Years
Enrollment: 60 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2009 – 2011
U.S. locations: 1
States / cities: Houston, Texas

Conditions: Osteoporosis
Interventions: Alendronate; Drug
Lead sponsor: Medical University of South Carolina; Other
Eligibility: 5 Years to 15 Years
Enrollment: 22 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2009
U.S. locations: 1
States / cities: Charleston, South Carolina

Conditions: Colorectal Cancer
Interventions: cholecalciferol, polymerase chain reaction, polymorphism analysis, protein expression analysis, reverse transcriptase-polymerase chain reaction, western blotting, high performance liquid chromatography, laboratory biomarker analysis, pharmacological study, adjuvant therapy, immunoscintigraphy; Dietary Supplement · Genetic · Other + 1 more
Lead sponsor: Roswell Park Cancer Institute; Other
Eligibility: 18 Years to 120 Years
Enrollment: 50 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2007 – 2010
U.S. locations: 1
States / cities: Buffalo, New York

Conditions: Anxiety Disorders and Symptoms, Fibromyalgia, Arthritis, Chronic Pain, Hypertension,Essential
Interventions: IV Vitamin Infused Therapy Treatment, Herbal medicine; Dietary Supplement · Drug
Lead sponsor: Faith A. Richardson; Other
Eligibility: 21 Years to 80 Years
Enrollment: 25 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2025 – 2026
U.S. locations: 1
States / cities: Dover, Delaware

Conditions: Acute Respiratory Distress Syndrome, Vitamin D Deficiency, Critical Illness
Interventions: Vitamin D3, Placebo; Drug
Lead sponsor: Massachusetts General Hospital; Other
Eligibility: 18 Years and older
Enrollment: 1,358 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2017 – 2018
U.S. locations: 47
States / cities: Fresno, California • Los Angeles, California • Sacramento, California + 34 more

Conditions: Inflammatory Bowel Disease (IBD)
Interventions: Vitamin D-3; Dietary Supplement
Lead sponsor: Nemours Children's Clinic; Other
Eligibility: 5 Years to 17 Years
Enrollment: 40 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2015
U.S. locations: 1
States / cities: Jacksonville, Florida

Conditions: Chronic Kidney Disease, Hyperparathyroidism, Secondary
Interventions: Cinacalcet hydrochloride, Standard of Care; Drug
Lead sponsor: Amgen; Industry
Eligibility: 28 Days to 2189 Days
Enrollment: 18 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2012 – 2016
U.S. locations: 17
States / cities: Birmingham, Alabama • Little Rock, Arkansas • Los Angeles, California + 14 more

Search by objective public record fields.

Supplementation in Adolescent Girls With Endometriosis

Vitamin D as a Modifier of Serum Hepcidin in Children With Chronic Kidney Disease

DAYLIGHT: Vitamin D Therapy in Individuals at High Risk of Hypertension

Randomized Trial of Regenexx Stem Cell Support Formula

Vitamin D Dose Finding Study

Efficacy and Safety of Cinacalcet in Pediatric Patients With Secondary Hyperparathyroidism (SHPT) and Chronic Kidney Disease (CKD) on Dialysis

Effect of Caloric Restriction and Protein Intake on Metabolism and Anabolic Sensitivity

Interventional Testing of Gene-environment Interactions Via the Verifomics Mobile Application

Open Label Clinical Trial of Vitamin D in Children With Autism

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

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

Cord Blood Plus Vitamin D and Omega 3s in T1D

Vitamin D in Minorities With Prediabetes

Empiric Versus Selective Prevention Strategies for Kidney Stone Disease

Plasma Lipids-Dependent Vitamin E Metabolism During Dynamic Hyperlipidemia

Vitamin D and Type 2 Diabetes - Treat-To-Target

Efficacy of Vitamin D Supplementation in Obese Children

Evaluation of Calcium, Vitamin D, Magnesium, and Zinc Absorption in Children

Safety and Efficacy of Alendronate (Fosamax) in Children With Osteoporosis

DNA Changes That Affect Vitamin D Metabolism in Patients With Colorectal Cancer Receiving Vitamin D Supplements

The Benefits of Natural Medicine, Vitamin IV Therapy and Supplements: Maintaining Good Health Through Nature

Vitamin D to Improve Outcomes by Leveraging Early Treatment

Vitamin D3 Supplementation in Pediatric IBD: Weely vs Daily Dosing Regimens

Safety & Tolerability of Cinacalcet in Pediatric Patients With Chronic Kidney Disease and Secondary Hyperparathyroidism