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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin D 2 Clear all
Completed Phase 2 Interventional Results available

S0535, Gemtuzumab and Combination Chemotherapy in Treating Patients With Previously Untreated Acute Promyelocytic Leukemia

NCT00551460
View directory record Official record
Conditions
Leukemia
Interventions
arsenic trioxide, gemtuzumab ozogamicin, mercaptopurine, methotrexate, tretinoin
Drug
Lead sponsor
SWOG Cancer Research Network
Network
Eligibility
18 Years to 120 Years
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2018
U.S. locations
192
States / cities
Roseville, California • Sacramento, California • Stanford, California + 139 more
Source: ClinicalTrials.gov public record
Updated Jan 9, 2023 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Precision Nutrition Impact on Health-Related Behavior Change

NCT04959318
View directory record Official record
Conditions
Metabolic Syndrome
Interventions
Professional nutrition counseling, No professional nutrition counseling
Other
Lead sponsor
Madigan Army Medical Center
Federal
Eligibility
18 Years to 45 Years
Enrollment
138 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Feb 10, 2025 · Synced Sep 29, 2026, 4:36 PM EDT
Withdrawn Phase 1Phase 2 Interventional

Tele-health Enabled Clinical Trial for COVID-19

NCT04489628
View directory record Official record
Conditions
SARS-CoV Infection
Interventions
Vitamin D3 or Placebo, Doctella telehealth monitoring
Drug · Device
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 6, 2022 · Synced Sep 29, 2026, 4:36 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D3 Supplementation for Vitamin D Deficiency in Rotator Cuff Repair Surgery

NCT05009498
View directory record Official record
Conditions
Vitamin D Deficiency, Rotator Cuff Tears
Interventions
Vitamin D3 supplementation, Placebo
Dietary Supplement · Other
Lead sponsor
Community Memorial Health System
Other
Eligibility
18 Years to 65 Years
Enrollment
240 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
2
States / cities
Ventura, California
Source: ClinicalTrials.gov public record
Updated Aug 16, 2021 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Calcium Supplement Particle Size and Vitamin D Supplement on Calcium Retention in Adolescent Girls

NCT01005381
View directory record Official record
Conditions
Osteoporosis
Interventions
Small Particle Size Calcium Carbonate Supplement, Large Particle Size Calcium Carbonate Supplement, Vitamin D, Calcium Placebo
Dietary Supplement
Lead sponsor
Purdue University
Other
Eligibility
12 Years to 14 Years · Female only
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated May 8, 2018 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 2 Interventional Results available

Statin/Vitamin D & Migraine Study

NCT01225263
View directory record Official record
Conditions
Migraine
Interventions
Simvastatin, Vitamin D, Placebo
Drug · Dietary Supplement · Other
Lead sponsor
Rami Burstein
Other
Eligibility
18 Years and older
Enrollment
89 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 25, 2016 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 2 Interventional

Calcium and Vitamin D vs Markers of Adenomatous Polyps

NCT00208793
View directory record Official record
Conditions
Colorectal Adenomatous Polyps
Interventions
Calcium and vitamin D3 combined, Placebo, Calcium, Vitamin D3
Dietary Supplement · Drug
Lead sponsor
Emory University
Other
Eligibility
30 Years to 74 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 25, 2013 · Synced Sep 29, 2026, 4:36 PM EDT
Recruiting Not applicable Interventional

Preserving Physical Function in Older Adults With Cancer: Impact of an Optimizing Nutrition Intervention Applied Before and After Surgery

NCT05912257
View directory record Official record
Conditions
Cancer
Interventions
Structured perioperative nutrition and exercise, Nutrition and Exercise Counseling
Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
55 Years and older
Enrollment
188 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 19, 2026 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin B6 Dependence of One-Carbon Metabolism

NCT00877812
View directory record Official record
Conditions
Vitamin B6 Deficiency
Interventions
Arm 1 glycine and leucine, Arm 2 Intervention of Serine and methionine infusion
Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
20 Years to 40 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Mar 26, 2013 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Nutritional Intervention for Age-related Muscular Function and Strength Losses

NCT00874575
View directory record Official record
Conditions
Muscle Strength, Sarcopenia
Interventions
Placebo, Vitamin D, Beta-hydroxy-Beta-methylbutyrate, Beta-hydroxy-Beta-methylbutyrate and Vitamin D
Dietary Supplement · Drug
Lead sponsor
Metabolic Technologies Inc.
Industry
Eligibility
60 Years and older
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2013
U.S. locations
2
States / cities
Ames, Iowa • Brookings, South Dakota
Source: ClinicalTrials.gov public record
Updated Sep 16, 2014 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 4 Interventional Results available

Impact on Reducing the Incidence of Low Serum Calcium by Providing Educational Materials on the Need to Take Daily Supplemental Calcium and Vitamin D to Patients With Paget's Disease Treated With Reclast®

NCT00668200
View directory record Official record
Conditions
Paget's Disease of the Bone, Hypocalcemia
Interventions
Reclast (ZOL446, zoledronic acid), Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
Not listed
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
9
States / cities
Phoenix, Arizona • Tucson, Arizona • Gainesville, Georgia + 6 more
Source: ClinicalTrials.gov public record
Updated Mar 5, 2015 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 3 Interventional Results available

Effectiveness of Paricalcitol in Reducing Parathyroid Hormone (PTH) Levels in X-linked Hypophosphatemic Rickets

NCT00417612
View directory record Official record
Conditions
Hypophosphatemia, Familial, Hyperparathyroidism
Interventions
Paricalcitol, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
9 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 16, 2020 · Synced Sep 29, 2026, 4:36 PM EDT
Terminated Phase 1 Interventional

Effect of High-Dose Vitamin D3 in Smokers and Non-Smokers With and Without HIV

NCT03270709
View directory record Official record
Conditions
HIV/AIDS, Vitamin D Deficiency, Smoker Lung
Interventions
Vitamin D3 450,000 IU orally
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 20, 2021 · Synced Sep 29, 2026, 4:36 PM EDT
Terminated Phase 3 Interventional Results available

Fixation Using Alternative Implants for the Treatment of Hip Fractures (FAITH-2)

NCT01908751
View directory record Official record
Conditions
Femoral Neck Fractures
Interventions
Sliding Hip Screw, Cancellous Screws, Vitamin D, Vitamin D Placebo
Procedure · Drug
Lead sponsor
McMaster University
Other
Eligibility
18 Years to 60 Years
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
10
States / cities
Phoenix, Arizona • San Francisco, California • Gainesville, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Nov 29, 2020 · Synced Sep 29, 2026, 4:36 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

A Clinical Study to Evaluate the Efficacy of Four Supplements on Improving Readiness for Intimacy

NCT05862519
View directory record Official record
Conditions
Libido, Intimacy, Gastrointestinal Issues
Interventions
Reset, Stay Ready Fiber, Libido, Testosterone supplement
Dietary Supplement
Lead sponsor
906 CMVI Holdings
Industry
Eligibility
18 Years to 44 Years · Male only
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated May 16, 2023 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Melatonin-Micronutrients for Osteopenia Treatment Study

NCT01870115
View directory record Official record
Conditions
Osteoporosis, Osteopenia
Interventions
Fiber Pill, Melatonin, Strontium citrate, Vitamins D3 and K2
Dietary Supplement
Lead sponsor
Duquesne University
Other
Eligibility
Female only
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2017
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 13, 2018 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Not applicable Interventional Results available

Effect of Vitamin D Supplementation on Inflammation and Cardiometabolic Risk Factors in Obese Adolescents

NCT01217840
View directory record Official record
Conditions
Obesity
Interventions
Drisdol (Ergocalciferol) Vitamin D2, Placebo
Drug
Lead sponsor
Stanford University
Other
Eligibility
11 Years to 17 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Nov 28, 2017 · Synced Sep 29, 2026, 4:36 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Study of Parental Ratings of Quality of Life and Body Composition in 5-19 Year Olds While Participating in the Good NEWS 4 Kids Program

NCT01855009
View directory record Official record
Conditions
Quality of Life, Body Mass Index
Interventions
MannaBears, AlgaeCal Calcium, Calcium carbonate, Vitamin D3
Dietary Supplement
Lead sponsor
Integrative Health Technologies, Inc.
Network
Eligibility
5 Years to 19 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jun 23, 2013 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Not applicable Interventional

Randomized Trial of Regenexx Stem Cell Support Formula

NCT04661267
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Dec 27, 2022 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Vitamin D for Established Type 2 Diabetes (DDM2)

NCT01736865
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Cholecalciferol, Placebo
Drug
Lead sponsor
Tufts Medical Center
Other
Eligibility
25 Years to 75 Years
Enrollment
127 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
2
States / cities
Boston, Massachusetts • Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 31, 2020 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 2 Interventional Results available

Metabolic Effects of Paricalcitol

NCT01003275
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Apr 27, 2014 · Synced Sep 29, 2026, 4:36 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 29, 2026, 4:36 PM EDT
Completed Phase 2 Interventional

13-Cis Retinoic Acid With or Without Vitamin E for Prevention of Lung Cancer

NCT00002586
View directory record Official record
Conditions
Drug Toxicity, Lung Cancer
Interventions
13-cis retinoic acid, Tocopherol
Drug · Dietary Supplement
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 90 Years
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1993 – 2005
U.S. locations
4
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated May 14, 2020 · Synced Sep 29, 2026, 4:36 PM EDT
Completed Phase 2 Interventional Results available

Safety and Effectiveness of Alendronate for Bone Mineral Density in HIV-infected Children and Adolescents

NCT00921557
View directory record Official record
Conditions
HIV Infection
Interventions
Alendronate, Placebo, Calcium carbonate/vitamin D
Drug · Dietary Supplement
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
11 Years to 24 Years
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2017
U.S. locations
7
States / cities
Los Angeles, California • Miami, Florida • Tampa, Florida + 4 more
Source: ClinicalTrials.gov public record
Updated Nov 4, 2021 · Synced Sep 29, 2026, 4:36 PM EDT