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ClinicalTrials.gov public records Last synced Sep 30, 2026, 2:00 PM EDT

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Showing 1–24 of 61 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: 1000 IU of Vitamin D3 Clear all
Completed Not applicable Interventional Accepts healthy volunteers Results available

Personalized Vitamin D Supplementation in European and African Americans

NCT02362269
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
Female only
Enrollment
169 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
2
States / cities
Madison, Wisconsin • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 1, 2020 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 3 Interventional

Effects of Teriparatide in the Treatment of Postmenopausal Women With Osteoporosis

NCT00670501
View directory record Official record
Conditions
Osteoporosis, Postmenopausal
Interventions
teriparatide, Placebo, Calcium Supplement, Vitamin D Supplement
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
30 Years to 85 Years · Female only
Enrollment
1,637 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 1999
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 1, 2008 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 2 Interventional Results available

Effect of Alendronate on Bone in People With Chronic Spinal Cord Injury (SCI) Previously Treated With Teriparatide

NCT02195895
View directory record Official record
Conditions
Spinal Cord Injury, Bone Loss, Osteoporosis
Interventions
Alendronate, Calcium, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Northwestern University
Other
Eligibility
21 Years and older
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 30, 2023 · Synced Sep 30, 2026, 2:00 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Bioavailability of Vitamin D(25(OH)D) and Omega-3 Fatty Acid (DHA) Enhanced Chicken

NCT05248737
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
DHA/EPA fortified chicken plus Placebo, non-25(OH)D fortified chicken/eggs plus vitamin D3 supplement, non-DHA bio-enhanced chicken plus supplement DHA Omega-3, 25(OH)D bioenhanced chicken and eggs plus placebo, Dietary Supplement: DHA/EPA fortified eggs plus Placebo, non-DHA bio-enhanced eggs plus supplement DHA Omega-3, non-25(OH)D fortified chicken/eggs plus placebo
Dietary Supplement · Other
Lead sponsor
Cornell University
Other
Eligibility
18 Years to 35 Years
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Ithaca, New York
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Vitamin D Supplementation and Physical Function in Older Adults

NCT01179503
View directory record Official record
Conditions
Physical Function, Vitamin D Insufficiency
Interventions
calcium, Vitamin D plus calcium
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
70 Years to 89 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 17, 2018 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 1 Interventional

Safety and Immunologic Effect of Low Dose Versus High Dose Vitamin D3 in Multiple Sclerosis

NCT01024777
View directory record Official record
Conditions
Multiple Sclerosis, Vitamin D Deficiency
Interventions
Cholecalciferol
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 55 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 6, 2013 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Investigation of the Effect of BONISTEIN(R) Bone Blend on Bone Mineral Density/Content and Biomarkers of Bone Health

NCT00698984
View directory record Official record
Conditions
Osteoporosis
Interventions
BONISTEIN(R) bone blend, Placebo
Dietary Supplement
Lead sponsor
dsm-firmenich Switzerland AG
Industry
Eligibility
45 Years to 55 Years · Female only
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 16, 2009 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 3 Interventional

Zoledronate, Calcium, and Vitamin D in Preventing Bone Loss in Women Receiving Adjuvant Chemotherapy for Breast Cancer

NCT00022087
View directory record Official record
Conditions
Breast Cancer, Osteoporosis
Interventions
calcium salts, cholecalciferol, zoledronic acid
Dietary Supplement · Drug
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
40 Years and older · Female only
Enrollment
439 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2009
U.S. locations
107
States / cities
Arroyo Grande, California • La Jolla, California • Mountain View, California + 80 more
Source: ClinicalTrials.gov public record
Updated Jul 19, 2016 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 2 Interventional Results available

Vitamin D to Prevent Autism in Newborn Siblings

NCT01366885
View directory record Official record
Conditions
Autistic Disorder
Interventions
Vitamin D3
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
20 Years to 44 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2016
U.S. locations
1
States / cities
Oregon City, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 14, 2016 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Availability of Vitamin D in Orange Juice

NCT01778114
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D2 in orange juice, Vitamin D3 in orange juice, Vitamin D2, Vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
86 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 29, 2017 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 2 Interventional Results available

Bone Mass and Strength After Kidney Transplantation

NCT02224144
View directory record Official record
Conditions
End Stage Renal Disease, Kidney Transplantation, Bone Loss, Fractures, Vascular Calcifications
Interventions
Vitamin D3, Calcitriol, Placebo
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 7, 2025 · Synced Sep 30, 2026, 2:00 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Metformin, Vitamin D, and Depression in Polycystic Ovary Syndrome (PCOS) Trial

NCT03380091
View directory record Official record
Conditions
PCOS, Depression, Vitamin D Deficiency, Insulin Resistance
Interventions
Metformin, Vitamin D
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Feb 9, 2021 · Synced Sep 30, 2026, 2:00 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

HMB Cerebral Palsy Pilot Study

NCT05384951
View directory record Official record
Conditions
Cerebral Palsy
Interventions
HMB + Vitamin D3
Dietary Supplement
Lead sponsor
Gillette Children's Specialty Healthcare
Other
Eligibility
13 Years to 17 Years
Enrollment
7 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Saint Paul, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 22, 2024 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Calcium and Vitamin D Supplementation During Marine Corps Training

NCT02636348
View directory record Official record
Conditions
Nutrition Status, Bone Health
Interventions
Calcium/Vitamin D, Placebo
Dietary Supplement
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
17 Years and older
Enrollment
380 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Parris Island, South Carolina
Source: ClinicalTrials.gov public record
Updated Oct 28, 2016 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Early Phase 1 Interventional

High Dose Vit D Musculoskeletal Symptoms & Bone Density in Anastrozole-Treated Breast Cancer With Marginal Vit D Status

NCT00263185
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Vitamin D, Calcium carbonate, Vitamin D, Placebo
Dietary Supplement · Drug · Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Sep 22, 2014 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study of Vitamin D and Uric Acid Lowering on Kidney and Blood Vessel Function

NCT01320722
View directory record Official record
Conditions
Renal Function, Endothelial Function, Blood Pressure, Overweight, Obesity
Interventions
Vitamin D ergocalciferol, Probenecid, Allopurinol, Placebo
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 75 Years
Enrollment
242 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 29, 2017 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Magnesium and Vitamin D Supplementation and Cardiometabolic Outcomes

NCT03134417
View directory record Official record
Conditions
Overweight and Obesity, Vitamin D Deficiency, Magnesium Deficiency, Cardiovascular Risk Factor
Interventions
Vitamin D and magnesium, Vitamin D, Placebo
Dietary Supplement
Lead sponsor
Drexel University
Other
Eligibility
30 Years to 70 Years
Enrollment
109 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 27, 2021 · Synced Sep 30, 2026, 2:00 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 14, 2018 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 2 Interventional

The Effects of Vitamin D and Bone Loss in Parkinson's Disease

NCT00907972
View directory record Official record
Conditions
Parkinson Disease
Interventions
Vitamin D3, Placebo
Dietary Supplement · Other
Lead sponsor
Memorial Medical Center
Other
Eligibility
18 Years and older
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Johnstown, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 12, 2013 · Synced Sep 30, 2026, 2:00 PM EDT
Terminated Phase 1 Interventional

Randomized Study Of Exercise And Vitamin D In Frail Elderly Subjects

NCT00249704
View directory record Official record
Conditions
Elderly, Frail
Interventions
Vitamin D + Sham Exercise, Vitamin D Placebo + Exercise, Vitamin D Placebo + Sham Exercise, Vitamin D + Exercise
Drug · Procedure
Lead sponsor
Pfizer
Industry
Eligibility
75 Years and older
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
4
States / cities
Farmington, Connecticut • Hyattsville, Maryland • Roslindale, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Jan 8, 2009 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

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

NCT00868738
View directory record Official record
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
Source: ClinicalTrials.gov public record
Updated Nov 2, 2011 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Phase 4 Interventional Results available

VERtebral Fracture Treatment Comparisons in Osteoporotic Women

NCT01709110
View directory record Official record
Conditions
Postmenopausal Osteoporosis
Interventions
Teriparatide, Risedronate, Placebo, Calcium, Vitamin D
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
45 Years and older · Female only
Enrollment
1,366 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
30
States / cities
Birmingham, Alabama • Concord, California • Fresno, California + 27 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2019 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans

NCT04939792
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D, Placebo, Vitamin D + L-cysteine, L-cysteine
Drug
Lead sponsor
Louisiana State University Health Sciences Center Shreveport
Other
Eligibility
18 Years to 65 Years
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Shreveport, Louisiana
Source: ClinicalTrials.gov public record
Updated Jun 8, 2023 · Synced Sep 30, 2026, 2:00 PM EDT
Completed Not applicable Interventional Results available

Impact of Vitamin D on Diabetic Kidney Disease in African Americans

NCT01214356
View directory record Official record
Conditions
Diabetic Kidney Disease
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years and older
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Oct 16, 2018 · Synced Sep 30, 2026, 2:00 PM EDT