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Showing 1–24 of 47 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Vitamin D Deficiency/Insufficiency Clear all
Completed Phase 1Phase 2 Interventional

The Effect of Oral Niacinamide on Plasma Phosphorus Levels in Peritoneal Dialysis Patients

NCT00508885
View directory record Official record
Conditions
Hyperphosphatemia
Interventions
Niacinamide, Placebo
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
17 participants
Timeline
2006 – 2007
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 29, 2007 · Synced Sep 25, 2026, 2:30 AM EDT
Not yet recruiting Phase 2 Interventional

Reducing Inflammation to Improve Vascular and Bone Outcomes With Low-dose Colchicine in CKD

NCT07654231
View directory record Official record
Conditions
Chronic Kidney Disease Mineral and Bone Disorder, Hypertension, Diabetes, Dyslipidemia, Atherosclerotic Cardiovascular Disease (ASCVD), Chronic Kidney Disease (Stage 3)
Interventions
Low-dose Colchicine at 0.5mg daily, Usual Care
Drug · Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 69 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jun 21, 2026 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Phase 4 Interventional

Vitamin D Deficiency in Chronic Kidney Disease (CKD) Patients

NCT00958451
View directory record Official record
Conditions
Secondary Hyperparathyroidism, Chronic Kidney Disease
Interventions
Paricalcitol, Ergocalciferol
Drug
Lead sponsor
Salem Veterans Affairs Medical Center
Federal
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Salem, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 23, 2011 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Not applicable Interventional Results available

Cholecalciferol (Vitamin D3) Therapy in Chronic Kidney Disease (CKD) Subjects

NCT00427037
View directory record Official record
Conditions
Chronic Kidney Disease, Vitamin D Deficiency
Interventions
Cholecalciferol, Placebo
Drug
Lead sponsor
Atlanta VA Medical Center
Federal
Eligibility
18 Years to 85 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2013
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jul 21, 2015 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Improving the Understanding of the Response to Vitamin D Supplementation

NCT01465178
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
cholecalciferol, Placebo
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
50 Years to 100 Years · Female only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 24, 2016 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Collegiate Athlete Study

NCT07631312
View directory record Official record
Conditions
Iron Deficiency, Iron Deficiency Anemia (IDA), Vitamin D Deficiency, Vitamin D Insufficiency, Low Energy Availability, Bone Density
Interventions
Iron and Vitamin D Deficiencies Correction
Dietary Supplement
Lead sponsor
Morehouse School of Medicine
Other
Eligibility
18 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 7, 2026 · Synced Sep 25, 2026, 2:30 AM EDT
Enrolling by invitation No phase listed Observational Accepts healthy volunteers

ALPCO 25(OH) Vitamin D CLIA Kit - Fresh Versus Frozen Serum and Plasma Stability Study

NCT07565064
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency, Healthy Volunteers
Interventions
ALPCO 25(OH) Vitamin D CLIA Kit
Device
Lead sponsor
American Laboratory Products Company
Industry
Eligibility
22 Years and older
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Salem, New Hampshire
Source: ClinicalTrials.gov public record
Updated May 3, 2026 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Defining Vitamin D Insufficiency in School Age Children: A Randomized Placebo Controlled Trial of Vitamin D3

NCT00732758
View directory record Official record
Conditions
Healthy
Interventions
Vitamin D3 1000 IU, Placebo Tablet
Dietary Supplement
Lead sponsor
University of Pittsburgh
Other
Eligibility
8 Years to 14 Years
Enrollment
157 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2011
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 28, 2015 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Phase 4 Interventional

A Randomized Phase IV Control Trial of Single High Dose Oral Vitamin D3 in Pediatric Patients Undergoing HSCT

NCT03176849
View directory record Official record
Conditions
Vitamin D Deficiency, Stem Cell Transplant Complications, Pediatric Cancer, Blood Disorder, Pediatric Acute Myeloid Leukemia, Pediatric Acute Lymphoid Leukemia, Myelodysplastic Syndromes, Sickle Cell Anemia in Children, Aplastic Anemia, Thalassemia in Children
Interventions
Vitamin D3, Standard Vitamin D3 Supplementation
Dietary Supplement
Lead sponsor
Phoenix Children's Hospital
Other
Eligibility
1 Year to 25 Years
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 16, 2020 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Not applicable Interventional Results available

Improving Vitamin D Status in Home-bound Elders

NCT01410084
View directory record Official record
Conditions
Vitamin D Deficiency, Accidental Falls
Interventions
Vitamin D3, Vitamin E
Dietary Supplement
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
65 Years and older
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Sep 8, 2019 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Solius UV Light Source in Improving Serum Levels of 25-hydroxyvitamin D

NCT04865432
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency
Interventions
UVB treatment
Device
Lead sponsor
Boston University
Other
Eligibility
22 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 22, 2022 · Synced Sep 25, 2026, 2:30 AM EDT
Terminated Phase 2 Interventional Results available

Safety, Efficacy, PK and PD of CTAP101 (Calcifediol) ER Capsules for SHPT in HD Patients VDI

NCT03602261
View directory record Official record
Conditions
Secondary Hyperparathyroidism Due to Renal Causes, Chronic Kidney Diseases, Vitamin D Deficiency, Stage 5 Chronic Kidney Disease
Interventions
Calcifediol Oral Capsule, Placebo oral capsule
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
18 Years and older
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
18
States / cities
Peoria, Arizona • Phoenix, Arizona • Cypress, California + 13 more
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Not applicable Interventional Results available

Impact of Vitamin D Repletion in Hemodialysis Patients

NCT01175798
View directory record Official record
Conditions
Vitamin D Deficiency, End-stage Renal Disease
Interventions
Cholecalciferol
Drug
Lead sponsor
Mehrotra, Anita, M.D.
Individual
Eligibility
18 Years and older
Enrollment
116 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 21, 2014 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency

NCT01651000
View directory record Official record
Conditions
Chronic Kidney Disease, Hyperparathyroidism, Secondary, Vitamin D Deficiency
Interventions
CTAP101 30 μg capsules, Sugar pill to CTAP101 30 μg capsules
Drug · Other
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years and older
Enrollment
213 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Bannockburn, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 12, 2025 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Vitamin D and Arterial Stiffness in Elderly

NCT03649802
View directory record Official record
Conditions
Vitamin D Deficiency, Arterial Stiffness
Interventions
Low dose vitamin D3, High dose vitamin D3
Dietary Supplement
Lead sponsor
Texas Tech University Health Sciences Center
Other
Eligibility
65 Years to 89 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Lubbock, Texas
Source: ClinicalTrials.gov public record
Updated Mar 20, 2022 · Synced Sep 25, 2026, 2:30 AM EDT
Completed No phase listed Observational Results available

Vascular Risk After Kidney Transplantation

NCT00374595
View directory record Official record
Conditions
Cardiovascular Disease, Chronic Kidney Disease, Diabetes, Vitamin D Deficiency, Hyperparathyroidism
Interventions
Not listed
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
338 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2023
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 1, 2023 · Synced Sep 25, 2026, 2:30 AM EDT
Recruiting No phase listed Observational

Precision Medicine Approaches to Renal Osteodystrophy

NCT05880914
View directory record Official record
Conditions
Renal Osteodystrophy, Chronic Kidney Diseases, CKD-MBD, Bone Turnover Rate Disorder, Secondary Hyperparathyroidism
Interventions
miRNAseq analysis, Standard treatment for bone disorder
Procedure · Drug
Lead sponsor
Thomas Nickolas
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Sep 25, 2026, 2:30 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Phosphate Assessment in Chronic Kidney Disease Patients Study

NCT07368946
View directory record Official record
Conditions
Chronic Kidney Disease (Stage 3-4), Chronic Kidney Disease Mineral and Bone Disorder
Interventions
Dietary Phosphorus Intake
Dietary Supplement
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Vitamin D Insufficiency in Man

NCT01848236
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D2, Vitamin D3
Dietary Supplement
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 2, 2020 · Synced Sep 25, 2026, 2:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Vitamin D Inadequacy in Rural Populations, Evaluation of Correction by Food Supplementation

NCT00690417
View directory record Official record
Conditions
Vitamin D Insufficiency, Vitamin D Deficiency
Interventions
Cholecalciferol (vitamin D3)
Dietary Supplement
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years and older · Female only
Enrollment
108 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2011
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Nov 23, 2011 · Synced Sep 25, 2026, 2:30 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Phosphorus Absorption in Healthy Adults and in Patients With Moderate Chronic Kidney Disease

NCT03108222
View directory record Official record
Conditions
Chronic Kidney Disease Mineral and Bone Disorder
Interventions
Phosphorus Absorption Test
Other
Lead sponsor
Purdue University
Other
Eligibility
30 Years to 75 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Jul 9, 2019 · Synced Sep 25, 2026, 2:30 AM EDT
Terminated Phase 3 Interventional Results available

Phase 3 Safety and Efficacy Study of CTAP101 Extended-release Capsules in Children With Secondary Hyperparathyroidism

NCT05543928
View directory record Official record
Conditions
Chronic Kidney Disease stage3, Chronic Kidney Disease stage4, Vitamin d Deficiency, Secondary Hyperparathyroidism
Interventions
CTAP101, Placebo
Drug
Lead sponsor
OPKO Health, Inc.
Industry
Eligibility
8 Years to 17 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
2
States / cities
Columbus, Ohio • Greenville, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 24, 2025 · Synced Sep 25, 2026, 2:30 AM EDT
Completed No phase listed Observational

A Study of 25-hydroxy Vitamin d Levels in Non-itching Hemodialysis Patients

NCT01548716
View directory record Official record
Conditions
Vitamin D Deficiency, End Stage Renal Disease
Interventions
Not listed
Lead sponsor
Winthrop University Hospital
Other
Eligibility
18 Years to 85 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
2
States / cities
Mineola, New York
Source: ClinicalTrials.gov public record
Updated Mar 7, 2012 · Synced Sep 25, 2026, 2:30 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Is Vitamin D Insufficiency and Deficiency Associated With Antepartum and Postpartum Depression?

NCT02272387
View directory record Official record
Conditions
Depression, Postpartum Depression
Interventions
Vitamin D3 (Cholecalciferol), Placebo
Dietary Supplement · Other
Lead sponsor
St. Luke's-Roosevelt Hospital Center
Other
Eligibility
18 Years and older · Female only
Enrollment
151 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 23, 2017 · Synced Sep 25, 2026, 2:30 AM EDT