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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Completed Not applicable Interventional

Pamidronate, Vitamin D, and Calcium for the Bone Disease of Kidney and Heart Transplantation

NCT00302627
View directory record Official record
Conditions
Transplant Bone Disease
Interventions
Pamidronate, vitamin D, Calcium Carbonate
Drug
Lead sponsor
Providence Health & Services
Other
Eligibility
18 Years and older
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2002
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Aug 28, 2018 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 2Phase 3 Interventional

Vitamin D Supplementation in HIV

NCT01475890
View directory record Official record
Conditions
HIV-infection/Aids
Interventions
Vitamin D3, Placebo
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
5 Years to 24 Years
Enrollment
58 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 16, 2017 · Synced Sep 9, 2026, 7:07 PM EDT
Not listed Not applicable Interventional

Effect of Vitamin D Status and Repletion on Postoperative Total Joint Arthroplasty Complications

NCT04229368
View directory record Official record
Conditions
Hip Arthropathy, Knee Arthropathy, Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
900 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 15, 2023 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Blackcurrants Modify Gut Microbiota and Reduce Osteoporosis and CVD Risk

NCT04431960
View directory record Official record
Conditions
Postmenopausal Osteoporosis, Gut Microbiota, Cardiovascular Diseases
Interventions
blackcurrant (BC) extract
Drug
Lead sponsor
University of Connecticut
Other
Eligibility
45 Years to 60 Years · Female only
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Storrs, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 11, 2025 · Synced Sep 9, 2026, 7:07 PM EDT
Suspended Phase 2 Interventional

Vitamin D Supplementation on Reported Rates of Taxane-Induced Neuropathy

NCT05259527
View directory record Official record
Conditions
Neuropathic Pain
Interventions
Ergocalciferol Capsules, Cholecalciferol Capsules
Drug · Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Vitamin D in OUD: Exploration of Alterations on the Dopamine D2/D3 Receptor System

NCT06261905
View directory record Official record
Conditions
Opioid Use Disorder
Interventions
[11C]-PHNO, Calcitriol, Placebo Control, PET Scan
Drug · Dietary Supplement · Other + 1 more
Lead sponsor
Yale University
Other
Eligibility
18 Years to 50 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 13, 2025 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Early Phase 1 Interventional

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

NCT02445066
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Aug 14, 2018 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 4 Interventional Results available

A Study That Will Compare the Effect of Two Drugs on Participants With Low Bone Mass and a Recent Hip Fracture

NCT00887354
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Risedronate, Placebo, Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
50 Years and older
Enrollment
224 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
6
States / cities
Fort Lauderdale, Florida • New Port Richey, Florida • Orlando, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 24, 2019 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 2 Interventional Results available

Effects of Vitamin D in Parkinson's Disease (PD)

NCT01119131
View directory record Official record
Conditions
Parkinson Disease, Accidental Falls
Interventions
Vitamin D3, calcium, Placebo
Drug · Dietary Supplement · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
50 Years to 99 Years
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 6, 2016 · Synced Sep 9, 2026, 7:07 PM EDT
Terminated Phase 4 Interventional Results available

Effect of Vitamin D Supplementation on Balance in CKD

NCT03710161
View directory record Official record
Conditions
Renal Insufficiency, Chronic, Kidney Failure, Chronic
Interventions
Vitamin D
Drug
Lead sponsor
University of Nebraska
Other
Eligibility
21 Years to 70 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Nov 30, 2023 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Not applicable Interventional Results available

Open-label Vitamin D Trial for Patients With Cystic Fibrosis and Allergic Bronchopulmonary Aspergillosis

NCT01222273
View directory record Official record
Conditions
Cystic Fibrosis, Allergic Bronchopulmonary Aspergillosis
Interventions
cholecalciferol (Vitamin D3)
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
12 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
2
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 28, 2018 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Not applicable Interventional Results available

Feasibility and Effectiveness of Micronutrients as Palliative Care Therapy in Patients With Congestive Heart Failure

NCT01474486
View directory record Official record
Conditions
Congestive Heart Failure, Ischemic Cardiomyopathy
Interventions
Micronutrients
Drug
Lead sponsor
Phoenix VA Health Care System
Federal
Eligibility
18 Years to 89 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Jun 9, 2021 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 1 Interventional

Acute Effects of Canagliflozin, a Sodium Glucose Co-Transporter 2 (SGLT2) Inhibitor on Bone Metabolism in Healthy Volunteers

NCT02404870
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Placebo, Canagliflozin
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2025 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of a Nutritional Technology for Vitamin D Absorption

NCT06266702
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
Experimental Oil with Phospholipids, Control Polyunsaturated Oil Blend
Other
Lead sponsor
Abbott Nutrition
Industry
Eligibility
18 Years to 55 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
North Canton, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 30, 2024 · Synced Sep 9, 2026, 7:07 PM EDT
Terminated Phase 2 Interventional Results available

Deferasirox, Cholecalciferol, and Azacitidine in the Treatment of Newly Diagnosed AML Patients Over 65

NCT02341495
View directory record Official record
Conditions
Acute Myeloid Leukemia
Interventions
Deferasirox, Cholecalciferol, Azacitidine
Drug
Lead sponsor
Elizabeth Henry
Other
Eligibility
65 Years to 89 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 26, 2020 · Synced Sep 9, 2026, 7:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Vitamin D and HIV-Cardiovascular Disease in Children and Young Adults

NCT01410305
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
8 Years to 25 Years
Enrollment
290 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
2
States / cities
Atlanta, Georgia • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 27, 2016 · Synced Sep 9, 2026, 7:07 PM EDT
Recruiting Not applicable Interventional

Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS)

NCT04355572
View directory record Official record
Conditions
Polycystic Ovarian Syndrome in Adolescent Females, Vitamin D Deficiency
Interventions
Vitamin D 4000IU daily, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
13 Years to 21 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Supplementation in Obesity and Weight Loss (3DD Study)

NCT01631292
View directory record Official record
Conditions
Osteoporosis
Interventions
600 IU Vitamin D3, 2000 IU Vitamin D3, 4000 IU Vitamin D3
Dietary Supplement
Lead sponsor
Rutgers University
Other
Eligibility
50 Years to 72 Years · Female only
Enrollment
81 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2019
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Nov 21, 2023 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 3 Interventional

Osteoporosis Prevention After Heart Transplant

NCT00000412
View directory record Official record
Conditions
Osteoporosis, Cardiac Transplantation
Interventions
Alendronate, Calcitriol, Placebo Alendronate, Placebo Calcitriol
Drug
Lead sponsor
Columbia University
Other
Eligibility
20 Years to 70 Years
Enrollment
149 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2002
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 6, 2015 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 2 Interventional Results available

Optimal Vitamin D3 Supplementation Strategies for Acute Fracture Healing

NCT02786498
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Mar 30, 2022 · Synced Sep 9, 2026, 7:07 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

An Investigation of a Multi-Function Skincare Product to Improve Aging, Eczema, and Acne Outcomes

NCT05873933
View directory record Official record
Conditions
Acne, Eczema, Skin Aging
Interventions
Hemptress Oil
Other
Lead sponsor
Hemptress
Industry
Eligibility
21 Years to 65 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Oct 8, 2024 · Synced Sep 9, 2026, 7:07 PM EDT
Terminated Phase 3 Interventional

A Phase III Study to Investigate if the Study Drug Diamyd Can Preserve Insulin Production and Improve Glycemic Control in Patients Newly Diagnosed With Type 1 Diabetes

NCT05018585
View directory record Official record
Conditions
Type 1 Diabetes Mellitus
Interventions
Recombinant human glutamic acid decarboxylase (rhGAD65) formulated in Alhydrogel®, Colecalciferol 2000 IU, Placebo
Biological · Dietary Supplement
Lead sponsor
Diamyd Medical AB
Industry
Eligibility
12 Years to 28 Years
Enrollment
321 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
13
States / cities
Newport Beach, California • Palo Alto, California • San Diego, California + 10 more
Source: ClinicalTrials.gov public record
Updated Aug 25, 2026 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 2 Interventional Results available

Vitamin D Levels in Stage IV Colorectal Cancer Patients

NCT01074216
View directory record Official record
Conditions
Colorectal Cancer
Interventions
vitamin D repletion with Cholecalciferol (vitamin D3 50,000 International Units)
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
5
States / cities
Basking Ridge, New Jersey • Commack, New York • New York, New York + 2 more
Source: ClinicalTrials.gov public record
Updated Feb 2, 2016 · Synced Sep 9, 2026, 7:07 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Vitamin D/Calcium Polyp Prevention Study

NCT00153816
View directory record Official record
Conditions
Colorectal Cancer, Polyps, Adenomas
Interventions
Calcium Carbonate, Vitamin D3, placebo
Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
45 Years to 75 Years
Enrollment
2,813 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2016
U.S. locations
10
States / cities
Los Angeles, California • Denver, Colorado • Atlanta, Georgia + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 14, 2017 · Synced Sep 9, 2026, 7:07 PM EDT