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ClinicalTrials.gov public records Last synced Oct 7, 2026, 10:40 AM EDT

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Showing 25–48 of 61 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: 1000 IU of Vitamin D3 Clear all
Not listed Phase 4 Interventional Accepts healthy volunteers

Effects of Omega-3 Fatty Acids on Bone and Frailty

NCT00634686
View directory record Official record
Conditions
Osteoporosis, Frailty
Interventions
DHA/EPA, Placebo capsule, Calcium with vitamin D
Dietary Supplement
Lead sponsor
Donaghue Medical Research Foundation
Other
Eligibility
65 Years and older · Female only
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Farmington, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 2, 2009 · Synced Oct 7, 2026, 10:40 AM EDT
Completed Phase 2 Interventional Results available

Zoledronic Acid in Preventing Osteoporosis in Patients Undergoing Donor Stem Cell Transplant

NCT00321932
View directory record Official record
Conditions
Leukemia, Lymphoma, Myelodysplastic Syndromes, Osteoporosis, Ovarian Cancer
Interventions
calcium, cholecalciferol, zoledronic acid
Dietary Supplement · Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
2
States / cities
Minneapolis, Minnesota • Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Mar 9, 2017 · Synced Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Vitamin D Supplementation on Cardiometabolic Risk Factors [The Daily D Health Study]

NCT01537809
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Tufts University
Other
Eligibility
9 Years to 14 Years
Enrollment
691 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 13, 2013 · Synced Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM EDT
Recruiting Phase 2 Interventional

Impact of Vitamin D Therapy on Thyroid Function and Antibody Levels in Pediatric Graves' Disease

NCT07369063
View directory record Official record
Conditions
Graves Disease, Graves' Disease, Hyperthyroidism
Interventions
Ergocalciferol 50,000 IU, Methimazole
Drug
Lead sponsor
Northwell Health
Other
Eligibility
9 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
New Hyde Park, New York
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Oct 7, 2026, 10:40 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D Supplementation and Acute Respiratory Infection in Older Long-Term Care Residents

NCT01102374
View directory record Official record
Conditions
Respiratory Infection
Interventions
High Dose Vitamin D, Standard Dose Vitamin D, Placebo, Usual Care
Drug · Dietary Supplement
Lead sponsor
University of Colorado, Denver
Other
Eligibility
60 Years and older
Enrollment
107 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Apr 21, 2017 · Synced Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM EDT
Active, not recruiting Not applicable Interventional

ViDES Trial (Vitamin D Extra Supplementation)

NCT05459298
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Placebo, 800 IU/day vitamin D supplementation with feedings in the first 28 days after birth, Usual Care
Dietary Supplement · Other
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
24 Hours to 96 Hours
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM EDT
Terminated Early Phase 1 Interventional

Maintenance Dosing of Vitamin D in Crohn's Disease

NCT03615378
View directory record Official record
Conditions
Crohns Disease, Vitamin D Deficiency
Interventions
5000 IU D3, 1000 IU D3, Placebo
Dietary Supplement
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jul 24, 2019 · Synced Oct 7, 2026, 10:40 AM 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 24, 2013 · Synced Oct 7, 2026, 10:40 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Vitamin D Intervention and Associated Changes in the Gut Microbiome and Vitamin D Levels in Healthy Adults

NCT05387876
View directory record Official record
Conditions
Colorectal Cancer
Interventions
Vitamin D intervention, Placebo intervention
Dietary Supplement
Lead sponsor
Baylor University
Other
Eligibility
18 Years to 79 Years
Enrollment
43 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Waco, Texas
Source: ClinicalTrials.gov public record
Updated May 24, 2022 · Synced Oct 7, 2026, 10:40 AM 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 9, 2018 · Synced Oct 7, 2026, 10:40 AM EDT
Completed Phase 4 Interventional Results available

Pilot Study for Zoledronic Acid to Prevent Bone Loss After Bariatric Surgery

NCT03424239
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Zoledronic Acid, Calcium citrate + vitamin D, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
25 Years to 100 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 29, 2021 · Synced Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D3 Supplementation Pilot Study

NCT01546103
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Cholecalciferol
Dietary Supplement
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
12 Years to 17 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 23, 2013 · Synced Oct 7, 2026, 10:40 AM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy Trial With Zoledronic Acid for the Treatment of Paget's Disease of Bone, Including an Extended Observation Period

NCT00051636
View directory record Official record
Conditions
Paget's Disease of Bone
Interventions
Zoledronic Acid, Risedronate, Placebo to Risedronate, Placebo to Zoledronic Acid, Calcium and Vitamin D
Drug · Dietary Supplement
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
30 Years and older
Enrollment
172 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2011
U.S. locations
12
States / cities
Santa Monica, California • Lakewood, Colorado • Boca Raton, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated May 15, 2012 · Synced Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM 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 Oct 7, 2026, 10:40 AM EDT
Completed Phase 3 Interventional Results available

Zoledronic Acid - Letrozole Adjuvant Synergy Trial (ZFAST) - Cancer Treatment Related Bone Loss in Postmenopausal Women With Estrogen Receptor Positive and/or Progesterone Receptor Positive Breast Cancer Receiving Adjuvant Hormonal Therapy

NCT00050011
View directory record Official record
Conditions
Breast Neoplasms, Osteoporosis
Interventions
Zoledronic Acid, Letrozole
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 85 Years · Female only
Enrollment
602 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2009
U.S. locations
43
States / cities
Springdale, Arkansas • Burbank, California • Lafayette, California + 39 more
Source: ClinicalTrials.gov public record
Updated Mar 21, 2014 · Synced Oct 7, 2026, 10:40 AM EDT