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ClinicalTrials.gov public records Last synced Oct 8, 2026, 10:16 PM EDT

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Showing 145–168 of 505 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Vitamins A and D Clear all
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 8, 2026, 10:16 PM EDT
Completed Phase 4 Interventional

Study of Safety and Efficacy of Doxercalciferol in Patients With Chronic Kidney Disease, Stage 3 or 4, and Secondary Hyperparathyroidism

NCT00123461
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Renal Failure, Chronic Renal Insufficiency
Interventions
Hectorol (doxercalciferol capsules), 0.5mcg
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
17
States / cities
Phoenix, Arizona • Alhambra, California • Riverside, California + 14 more
Source: ClinicalTrials.gov public record
Updated May 5, 2015 · Synced Oct 8, 2026, 10:16 PM EDT
Completed No phase listed Observational

Relationship Between Vitamin D Biomarkers and Survival in Blood Samples From Patients With Advanced Pancreatic Cancer

NCT01327794
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
polymorphism analysis, immunologic technique, laboratory biomarker analysis, medical chart review
Genetic · Other
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older
Enrollment
265 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Glens Falls, New York
Source: ClinicalTrials.gov public record
Updated Jun 29, 2016 · Synced Oct 8, 2026, 10:16 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Vitamin D for Painful Nocturnal Leg Cramps

NCT00715429
View directory record Official record
Conditions
Leg Cramps, Nocturnal
Interventions
vitamin d, placebo
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
50 Years and older
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2011
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 17, 2019 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D Supplementation During Pregnancy on Clinical Outcomes and Immune Function

NCT01417351
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
400 IU vitamin D3, 2,000 IU Vitamin D3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
18 Years to 45 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
2
States / cities
Davis, California • Sacramento, California
Source: ClinicalTrials.gov public record
Updated Jul 23, 2013 · Synced Oct 8, 2026, 10:16 PM EDT
Not listed Not applicable Interventional

Combined Effects of Diabetes Self-Management Education and Nutritional Supplementation on Visual Function and Retinopathy

NCT04120077
View directory record Official record
Conditions
Diabetes Mellitus, Diabetic Retinopathy
Interventions
EyePromise DVS, EyePromise DVS plus EyePromise EZTears
Dietary Supplement
Lead sponsor
ZeaVision, LLC
Industry
Eligibility
18 Years to 85 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 23, 2021 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of Burosumab Versus Oral Phosphate and Active Vitamin D Treatment in Pediatric Patients With XLH

NCT02915705
View directory record Official record
Conditions
X-Linked Hypophosphatemia
Interventions
burosumab, Oral Phosphate Supplement, active vitamin D
Biological · Drug
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
1 Year to 12 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
5
States / cities
Los Angeles, California • San Francisco, California • Indianapolis, Indiana + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 29, 2024 · Synced Oct 8, 2026, 10:16 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 Oct 8, 2026, 10:16 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 29, 2018 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

Prevention of Bone Loss After Pediatric Hematopoietic Cell Transplantation

NCT02074631
View directory record Official record
Conditions
Osteopenia, Osteoporosis
Interventions
Pamidronate, Calcium and vitamin D
Drug
Lead sponsor
Masonic Cancer Center, University of Minnesota
Other
Eligibility
1 Year to 20 Years
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
2
States / cities
Minneapolis, Minnesota • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Feb 20, 2024 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Vitamin D Deficiency, Insulin Resistance and FGF-23

NCT00491322
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Ergocalciferol, Ergocalciferol placebo
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 45 Years
Enrollment
92 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 2, 2018 · Synced Oct 8, 2026, 10:16 PM EDT
Terminated Early Phase 1 Interventional

Vitamin D and Cocaine Administration

NCT04826133
View directory record Official record
Conditions
Cocaine Use Disorder
Interventions
Calcitriol, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
30 Years to 55 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 14, 2023 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Dietary Guidelines 3 Diets Study

NCT04981847
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Dietary Intervention Meetings
Behavioral
Lead sponsor
University of South Carolina
Other
Eligibility
18 Years to 65 Years
Enrollment
63 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Columbia, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluating Whole Foods Supplementation on Cognition

NCT01672359
View directory record Official record
Conditions
Sub-optimal Cognitive Function, Sub-optimal Immune Function
Interventions
Ginkgo Synergy® and Choline, OPC Synergy® and Catalyn, Placebo
Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
60 Years and older
Enrollment
97 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Aug 6, 2014 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Combinatorial Nutritional Supplementation on Immune Function in Healthy Older Adults

NCT02876315
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Redoxon VI, placebo
Dietary Supplement
Lead sponsor
Oregon State University
Other
Eligibility
55 Years to 75 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Corvallis, Oregon
Source: ClinicalTrials.gov public record
Updated Dec 1, 2022 · Synced Oct 8, 2026, 10:16 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Evaluate the Change in Iron, Vitamin D, and C-Reactive Protein Level (CRP) in a 12 to 24 Week Period

NCT01328704
View directory record Official record
Conditions
Anemia, Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
Avera McKennan Hospital & University Health Center
Other
Eligibility
30 Years to 50 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Sioux Falls, South Dakota
Source: ClinicalTrials.gov public record
Updated Aug 25, 2014 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

Vitamin D Dose Finding Study

NCT01092338
View directory record Official record
Conditions
HIV Infections, AIDS
Interventions
Cholecalciferol (Vit D3)
Drug
Lead sponsor
Children's Hospital of Philadelphia
Other
Eligibility
5 Years to 24 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 18, 2013 · Synced Oct 8, 2026, 10:16 PM EDT
Not listed No phase listed Observational

Emulated Study of Vitamin D Correction Vs Non-Correction

NCT06366776
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Not listed
Lead sponsor
The Cooper Health System
Other
Eligibility
18 Years and older
Enrollment
9,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Camden, New Jersey
Source: ClinicalTrials.gov public record
Updated Jan 22, 2025 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assessment of Vitamin D Supplementation and Immune Function

NCT01399151
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D - Treatment 1, Vitamin D - Treatment 2, Vitamin D - Treatment 3
Dietary Supplement
Lead sponsor
USDA, Western Human Nutrition Research Center
Federal
Eligibility
20 Years to 49 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Davis, California
Source: ClinicalTrials.gov public record
Updated Apr 22, 2014 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Rayaldee for Treating Mild to Moderate COVID-19

NCT04551911
View directory record Official record
Conditions
COVID-19, Coronavirus, SARS-CoV2 Infection
Interventions
Rayaldee, Placebo
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
10
States / cities
San Francisco, California • Miami, Florida • Evanston, Illinois + 6 more
Source: ClinicalTrials.gov public record
Updated May 28, 2024 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

CYP3A4 Activity and Mineral Homeostasis

NCT02019875
View directory record Official record
Conditions
Vitamin D and Calcium Homeostasis
Interventions
Rifampin, Clarithromycin, Grapefruit Juice, Placebo
Drug · Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 60 Years
Enrollment
92 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2020
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Apr 19, 2023 · Synced Oct 8, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

Calcitriol, Physical Activity, and Bone Health in Cancer Survivors

NCT00904033
View directory record Official record
Conditions
Breast Neoplasms, Bone and Bones
Interventions
Calcitriol, Exercise, Multivitamin
Drug · Behavioral · Dietary Supplement
Lead sponsor
University of Rochester
Other
Eligibility
18 Years and older · Female only
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2018
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Apr 23, 2019 · Synced Oct 8, 2026, 10:16 PM EDT
Active, not recruiting Phase 4 Interventional

Novel Precision Medicine Approach to Treatment of Osteoporosis Based on Bone Turnover

NCT05151484
View directory record Official record
Conditions
Age-Related Osteoporosis
Interventions
Teriparatide, Alendronate
Drug
Lead sponsor
Madhumathi Rao
Other
Eligibility
40 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated May 14, 2026 · Synced Oct 8, 2026, 10:16 PM 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 8, 2026, 10:16 PM EDT