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ClinicalTrials.gov public records Last synced Oct 23, 2026, 10:10 AM EDT

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Showing 1–24 of 217 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamin D Assessment Clear all
Completed Not applicable Interventional Accepts healthy volunteers

CLA and Vitamin D on Protein Turnover

NCT03115775
View directory record Official record
Conditions
Protein
Interventions
Conjugated linoleic acid, Vitamin D, Conjugated linoleic acid and Vitamin D, Corn oil (placebo)
Dietary Supplement · Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
65 Years to 85 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Nov 21, 2019 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial.

NCT00882505
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
vitamin D, Placebo
Dietary Supplement · Other
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 47 Years · Female only
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 2, 2021 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Evaluation of Vitamin D Requirements During Pregnancy

NCT00292591
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol (vitamin D3), cholecalciferol
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
16 Years to 45 Years · Female only
Enrollment
501 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2010
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Sep 19, 2016 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 4 Interventional

Comparison of Absorption of Vitamin D in Cystic Fibrosis

NCT01880346
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Vitamin D Powder, Vitamin D Oil
Dietary Supplement
Lead sponsor
Emory University
Other
Eligibility
18 Years to 59 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 20, 2015 · Synced Oct 23, 2026, 10:10 AM EDT
Completed No phase listed Observational

Novel Molecular Targets for Ductal Carcinoma In Situ (DCIS)

NCT03148015
View directory record Official record
Conditions
Breast Cancer
Interventions
Biomarkers
Other
Lead sponsor
Sentara Norfolk General Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
Newport News, Virginia
Source: ClinicalTrials.gov public record
Updated May 27, 2022 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Personalized Lifestyle Intervention for Improving Functional Health Outcomes Using N-of-1 Tent-Umbrella-Bucket Design

NCT04005456
View directory record Official record
Conditions
Health, Subjective, Gastrointestinal Dysfunction, Cardiovascular Risk Factor, Autoimmune Diseases, Dental Diseases, Hormone Disturbance, Neurocognitive Dysfunction
Interventions
Supplements and/or medical foods, Behavioral change support program, Food plan
Dietary Supplement · Behavioral · Other
Lead sponsor
Metagenics, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2022
U.S. locations
1
States / cities
Gig Harbor, Washington
Source: ClinicalTrials.gov public record
Updated Oct 30, 2023 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 1 Interventional

Effects of Vitamin D Replacement in Patients With Primary Hyperparathyroidism (PHPT)

NCT00538720
View directory record Official record
Conditions
Hyperparathyroidism
Interventions
Vitamin D, Four-dimensional computed tomography (4DCT)
Drug · Device
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
21 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2018
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 25, 2019 · Synced Oct 23, 2026, 10:10 AM EDT
Active, not recruiting Phase 3 Interventional

Efficacy and Safety of Encaleret Compared to Standard of Care in Participants With ADH1

NCT05680818
View directory record Official record
Conditions
Autosomal Dominant Hypocalcemia (ADH)
Interventions
Encaleret, Standard of Care
Drug · Dietary Supplement
Lead sponsor
Calcilytix Therapeutics, Inc., a BridgeBio company
Industry
Eligibility
16 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
11
States / cities
Oakland, California • Aurora, Colorado • Indianapolis, Indiana + 8 more
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Oct 23, 2026, 10:10 AM EDT
Recruiting Phase 2 Interventional

Ascorbic Acid and Chemotherapy for the Treatment of Relapsed or Refractory Lymphoma, CCUS, and Chronic Myelomonocytic Leukemia

NCT03418038
View directory record Official record
Conditions
Clonal Cytopenia of Undetermined Significance, High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements, Recurrent Diffuse Large B-Cell Lymphoma, Recurrent Hodgkin Lymphoma, Recurrent Lymphoma, Refractory Diffuse Large B-Cell Lymphoma, Refractory Lymphoma, Chronic Myelomonocytic Leukemia
Interventions
Ascorbic Acid, Carboplatin, Cisplatin, Cytarabine, Dexamethasone, Etoposide, Gemcitabine Hydrochloride, Ifosfamide, Laboratory Biomarker Analysis, Oxaliplatin, Placebo Administration, Questionnaire Administration, Rituximab, Decitabine, Biospecimen Collection, Core Biopsy, Bone Marrow Aspiration, Bone Marrow Biopsy, Echocardiography, Positron Emission Tomography, Magnetic Resonance Imaging, Central Venous Cannula Insertion, Portacath Placement, Computed Tomography, Decitabine and Cedazuridine
Dietary Supplement · Drug · Other + 2 more
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2033
U.S. locations
4
States / cities
Mankato, Minnesota • Rochester, Minnesota • Eau Claire, Wisconsin + 1 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2026 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D's Effect on Physical Performance in the Elderly

NCT02066441
View directory record Official record
Conditions
Family Member
Interventions
Bio-D-Mulsion Forte®, Placebo
Dietary Supplement · Other
Lead sponsor
University of Miami
Other
Eligibility
55 Years and older
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated May 19, 2015 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 4 Interventional Results available

A Study of Zemplar® Injection and Hectorol® Injection on Intestinal Absorption of Calcium in Chronic Kidney Disease

NCT00257920
View directory record Official record
Conditions
Chronic Kidney Disease, Stage 5, Secondary Hyperparathyroidism
Interventions
Zemplar® injection, Hectorol® injection
Drug
Lead sponsor
Abbott
Industry
Eligibility
20 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2006
U.S. locations
2
States / cities
Bellevue, Nebraska • Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Dec 24, 2009 · Synced Oct 23, 2026, 10:10 AM EDT
Recruiting Phase 3 Interventional

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

NCT07366086
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Oct 23, 2026, 10:10 AM EDT
Recruiting Phase 3 Interventional

Testing the Addition of 131I-MIBG or Lorlatinib to Intensive Therapy in People With High-Risk Neuroblastoma (NBL)

NCT03126916
View directory record Official record
Conditions
Ganglioneuroblastoma, Ganglioneuroblastoma, Nodular, Neuroblastoma
Interventions
Autologous Hematopoietic Stem Cell Transplantation, Biospecimen Collection, Bone Marrow Aspiration and Biopsy, Busulfan, Carboplatin, Cisplatin, Computed Tomography, Cyclophosphamide, Dexrazoxane Hydrochloride, Dinutuximab, Doxorubicin Hydrochloride, Echocardiography Test, Etoposide Phosphate, External Beam Radiation Therapy, Iobenguane I-123, Iobenguane I-131, Isotretinoin, Lorlatinib, Magnetic Resonance Imaging, Melphalan Hydrochloride, Multigated Acquisition Scan, Positron Emission Tomography, Sargramostim, Therapeutic Conventional Surgery, Thiotepa, Topotecan Hydrochloride, Vincristine Sulfate
Procedure · Drug · Biological + 1 more
Lead sponsor
Children's Oncology Group
Network
Eligibility
365 Days to 30 Years
Enrollment
750 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2030
U.S. locations
152
States / cities
Birmingham, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 121 more
Source: ClinicalTrials.gov public record
Updated Aug 25, 2026 · Synced Oct 23, 2026, 10:10 AM EDT
Active, not recruiting Not applicable Interventional

Effects of Vitamin K on Lower-extremity Function in Adults With Osteoarthritis:

NCT05505552
View directory record Official record
Conditions
Osteo Arthritis Knee
Interventions
Vitamin K, Placebo
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
50 Years and older
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
3
States / cities
Boston, Massachusetts • Worcester, Massachusetts • Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 17, 2025 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation and Management of Metabolic Bone Disease in Kidney Transplant Recipients

NCT03958409
View directory record Official record
Conditions
Skeletal Anomalies, Kidney Transplant; Complications
Interventions
measurements to evaluate metabolic bone disease, standard care
Diagnostic Test
Lead sponsor
Yale University
Other
Eligibility
30 Years to 65 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 28, 2023 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Fat Malabsorption in Chronic Pancreatitis

NCT02849704
View directory record Official record
Conditions
Chronic Pancreatitis
Interventions
Creon36™
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
30 Years to 70 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 3, 2019 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Gene Expression, Metabolomic, Microbiome, and Calcium Metabolism in Response to Varied Vitamin D Dosages

NCT02856776
View directory record Official record
Conditions
Vitamin D Insufficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Boston University
Other
Eligibility
18 Years to 50 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 18, 2019 · Synced Oct 23, 2026, 10:10 AM EDT
Terminated Phase 3 Interventional Results available

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

NCT01173848
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Apr 4, 2017 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Effect of Oral Vitamin D Versus Narrow-Band UV-B Exposure on the Lipid Profile

NCT01688102
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Oral Vitamin D3, Ultraviolet Light
Dietary Supplement · Radiation
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 70 Years
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 6, 2017 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 1 Interventional Results available

Clearance of 25-hydroxyvitamin D in Chronic Kidney Disease

NCT02937350
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Sep 1, 2021 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Potential Vitamin D Effects on Muscle: a Pilot Study

NCT00593996
View directory record Official record
Conditions
Dysphagia, Fecal Incontinence, Urinary Incontinence
Interventions
Ergocalciferol (vitamin D2)
Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
70 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2006
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Oct 5, 2015 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 2 Interventional Results available

Personalized Treatment Algorithms for Difficult-to-treat Asthma

NCT04179461
View directory record Official record
Conditions
Asthma in Children
Interventions
Cholecalciferol, antihistamine, Azithromycin, emollient cream, Fluticasone Propionate, Asthma Controller Medication
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
6 Years to 17 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 20, 2021 · Synced Oct 23, 2026, 10:10 AM EDT
Not listed Not applicable Interventional

Diabetic Retinopathy Functional Evaluation Study: Monitoring Carotenoid Vitamins Treatment Using ERG

NCT04117022
View directory record Official record
Conditions
Diabetes, Diabetic Retinopathy
Interventions
DVS supplementation
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
21 Years to 80 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
2
States / cities
Pomona, California • Tahlequah, Oklahoma
Source: ClinicalTrials.gov public record
Updated Apr 23, 2021 · Synced Oct 23, 2026, 10:10 AM EDT
Completed Phase 3 Interventional Results available

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

NCT01704079
View directory record Official record
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
216 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Bannockburn, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 13, 2025 · Synced Oct 23, 2026, 10:10 AM EDT