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ClinicalTrials.gov public records Last synced Oct 12, 2026, 7:10 AM EDT

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Showing 241–264 of 505 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamins A and D Clear all
Completed Phase 4 Interventional Results available

A Study of Bonviva (Ibandronate) in Women With Post-Menopausal Osteoporosis Who Have Received Previous Bonviva Treatment

NCT00551174
View directory record Official record
Conditions
Post-Menopausal Osteoporosis
Interventions
ibandronate [Bonviva/Boniva]
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
Female only
Enrollment
781 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2008
U.S. locations
6
States / cities
Gainesville, Georgia • St Louis, Missouri • Omaha, Nebraska + 3 more
Source: ClinicalTrials.gov public record
Updated Jul 22, 2011 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Same-day Cervical Preparation Before Dilation and Evacuation

NCT03002441
View directory record Official record
Conditions
Cervical Dilation Prior to Dilation and Evacuation
Interventions
Same-Day Dilapan-S, Overnight Dilapan-S
Device
Lead sponsor
Planned Parenthood of Greater New York
Other
Eligibility
18 Years and older · Female only
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 22, 2021 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 2 Interventional

Safety Study of CTA018 Injection to Treat Stage 5 Chronic Kidney Disease

NCT00742716
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions
CTA018 Injection
Drug
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
5
States / cities
Pembroke Pines, Florida • Meridian, Idaho • Springfield, Massachusetts + 2 more
Source: ClinicalTrials.gov public record
Updated Nov 6, 2014 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Not applicable Interventional

DAILY: Vitamin D, Aspirin, ExercIse, Low Saturated Fat Foods StudY in Colorectal Cancer Patients With Minimal Residual Disease

NCT05036109
View directory record Official record
Conditions
Colorectal Cancer, Colon Cancer
Interventions
Aspirin, Vitamin D, Diet, Physical Activity, Behavioral Support Counseling Sessions
Drug · Dietary Supplement · Other + 1 more
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 10, 2026 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 2 Interventional Results available

Vitamin D as a Modifier of Serum Hepcidin in Children With Chronic Kidney Disease

NCT01532349
View directory record Official record
Conditions
Anemia of Chronic Kidney Disease
Interventions
Cholecalciferol
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
1 Year to 21 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 14, 2017 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 2 Interventional

Calcitriol and Dexamethasone in Treating Patients With Prostate Cancer Who Have Undergone Surgery or Radiation Therapy

NCT00054522
View directory record Official record
Conditions
Prostate Cancer
Interventions
calcitriol, dexamethasone
Dietary Supplement · Drug
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older · Male only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2006
U.S. locations
2
States / cities
Buffalo, New York • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 8, 2011 · Synced Oct 12, 2026, 7:10 AM EDT
Terminated Not applicable Interventional Results available

Effects of Ergocalciferol on Erythropoetin Stimulating Agent Dose

NCT01263028
View directory record Official record
Conditions
Chronic Kidney Disease Stages 3-5
Interventions
Ergocalciferol supplementation
Drug
Lead sponsor
Kaiser Permanente
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 30, 2015 · Synced Oct 12, 2026, 7:10 AM 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 Oct 12, 2026, 7:10 AM EDT
Completed Phase 4 Interventional Results available

Effects of Teriparatide or Denosumab on Bone in Postmenopausal Women With Osteoporosis

NCT01753856
View directory record Official record
Conditions
Osteoporosis
Interventions
Teriparatide, Denosumab, Demeclocycline, Tetracycline, Calcium Supplement, Vitamin D
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
55 Years to 89 Years · Female only
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
4
States / cities
Lakewood, Colorado • Gainesville, Georgia • Detroit, Michigan + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 8, 2015 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 4 Interventional Results available

Novel Combination Therapy for Osteoporosis in Men

NCT03994172
View directory record Official record
Conditions
Male Osteoporosis
Interventions
Teriparatide or human parathyroid hormone (PTH) 1-34, Cinacalcet, placebo tablet, Calcium citrate tablet, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
60 Years to 85 Years · Male only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 3, 2026 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D and Sexual Health

NCT01450462
View directory record Official record
Conditions
Bacterial Vaginosis
Interventions
Vitamin D3 (cholecalciferol), Placebo
Dietary Supplement
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
118 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 4, 2013 · Synced Oct 12, 2026, 7:10 AM EDT
Terminated Phase 4 Interventional Results available

Thiazolidinedione Intervention With Vitamin D Evaluation

NCT00879970
View directory record Official record
Conditions
Diabetes Mellitus, Type 2
Interventions
pioglitazone, rosiglitazone, placebo, Vitamin D, Placebo
Drug · Dietary Supplement
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
50 Years and older
Enrollment
1,332 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
23
States / cities
Long Beach, California • Los Angeles, California • Northridge, California + 19 more
Source: ClinicalTrials.gov public record
Updated Apr 18, 2017 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Antenatal Micronutrient Supplementation and Infant Survival

NCT00860470
View directory record Official record
Conditions
Infant Mortality, Preterm Birth, Low Birth Weight, Neonatal Mortality, Perinatal Mortality
Interventions
Iron (27 mg) - folic acid (600 ug), Multiple micronutrient
Dietary Supplement
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
12 Years to 45 Years · Female only
Enrollment
44,567 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 19, 2022 · Synced Oct 12, 2026, 7:10 AM EDT
Active, not recruiting Phase 4 Interventional Accepts healthy volunteers

Vitamin D Supplementation in the Prevention and Mitigation of COVID-19 Infection

NCT04482673
View directory record Official record
Conditions
COVID-19, Vitamin D Deficiency, Respiratory Viral Infection
Interventions
Daily Vitamin D3, Daily placebo, Bolus vitamin D3, Bolus placebo
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
50 Years and older
Enrollment
95 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Feb 24, 2023 · Synced Oct 12, 2026, 7:10 AM EDT
Withdrawn Phase 2 Interventional

Vitamin D Deficiency Causes Immune Dysfunction and Enables or Perpetuates the Development of Rheumatoid Arthritis

NCT00279461
View directory record Official record
Conditions
Arthritis, Rheumatoid, Vitamin D Deficiency
Interventions
Placebo in arm A and Vitamin D in arm B, vitamin D 3 for arm A ,and matching placebo for arm B
Drug
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Aug 4, 2015 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 3 Interventional Results available

Calcium and Vitamin D to Optimize Bone Mass in Boys With Risperidone-induced Hyperprolactinemia

NCT00799383
View directory record Official record
Conditions
Risperidone-induced Hyperprolactinemia
Interventions
Calcium and Vitamin D, Placebo
Drug · Other
Lead sponsor
Chadi A. Calarge
Other
Eligibility
5 Years to 17 Years · Male only
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2014
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Dec 26, 2017 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of Egg Consumption on Carotenoid and Vitamin D Bioavailability in Pre- and Post-menopausal Women

NCT02679794
View directory record Official record
Conditions
Menopause
Interventions
Egg consumption, Control
Behavioral
Lead sponsor
Purdue University
Other
Eligibility
19 Years and older · Female only
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Jan 11, 2018 · Synced Oct 12, 2026, 7:10 AM EDT
Terminated Phase 1 Interventional

Calcitriol, Cisplatin, and Gemcitabine Hydrochloride in Treating Patients With Advanced Solid Tumors That Cannot Be Removed by Surgery

NCT01093092
View directory record Official record
Conditions
Adult Solid Neoplasm
Interventions
Calcitriol, Cisplatin, Gemcitabine Hydrochloride, Pharmacological Study
Dietary Supplement · Drug · Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
2
States / cities
Buffalo, New York • Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Jan 12, 2016 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Vitamin D Supplementation in RNA-seq Profiles of Single-core Prostate Samples, Among Veterans

NCT04621500
View directory record Official record
Conditions
Prostate Cancer, Vitamin D Deficiency, Stress Reaction
Interventions
cholecalciferol, Standard of Care Prostate Biopsy - collection of 13th core for RNA-seq, Standard of Care Prostate Biopsies at baseline and after one year vitamin D3 supplementation, Allostatic Load
Drug · Procedure · Diagnostic Test
Lead sponsor
Medical University of South Carolina
Other
Eligibility
50 Years to 75 Years · Male only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 4, 2025 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 4 Interventional

A Trial Evaluating Vitamin D Normalization on Major Adverse Cardiovascular-Related Events Among Myocardial Infarction Patients

NCT02996721
View directory record Official record
Conditions
Death, Myocardial Infarction, Cerebral Vascular Accident, Heart Failure Hospitalization
Interventions
Vitamin D3
Biological
Lead sponsor
Intermountain Health Care, Inc.
Other
Eligibility
18 Years and older
Enrollment
634 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2025
U.S. locations
1
States / cities
Murray, Utah
Source: ClinicalTrials.gov public record
Updated Dec 17, 2025 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Randomized Controlled Trial Testing The Effect Of A Multi-Nutrient Fortified Juice

NCT01909063
View directory record Official record
Conditions
Vitamin D Deficiency, Hypovitaminosis A, Vitamin E Deficiency
Interventions
Vitamin D, Vitamin D, Vitamin E, and Vitamin A, Control, 700 mg Calcium
Dietary Supplement
Lead sponsor
Boston University
Other
Eligibility
6 Years to 10 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2008
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 28, 2017 · Synced Oct 12, 2026, 7:10 AM EDT
Terminated Phase 2 Interventional Results available

Randomized Proof-of-Concept Trial to Evaluate the Safety and Explore the Effectiveness of Resveratrol, a Plant Polyphenol, for COVID-19

NCT04400890
View directory record Official record
Conditions
COVID-19
Interventions
Resveratrol, Vitamin D3
Drug · Dietary Supplement
Lead sponsor
Marvin McCreary, MD
Other
Eligibility
45 Years and older
Enrollment
105 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 24, 2023 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 4 Interventional

Study to Evaluate the Effects of Zemplar Injection and Calcijex on Intestinal Absorption of Calcium

NCT00073710
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Zemplar, 42 Ca carbonate absorption via single tracer method, Calcijex
Drug · Procedure
Lead sponsor
Abbott
Industry
Eligibility
20 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2004
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Aug 2, 2006 · Synced Oct 12, 2026, 7:10 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Vitamin D HIV Study on Postmenopausal Women

NCT01375010
View directory record Official record
Conditions
HIV
Interventions
Vitamin D3, Placebo, Vitamin Supplements
Drug · Other
Lead sponsor
Columbia University
Other
Eligibility
40 Years to 70 Years · Female only
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 7, 2019 · Synced Oct 12, 2026, 7:10 AM EDT