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Showing 1–24 of 134 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Vitamin D alone Clear all
Completed Not applicable Interventional Results available

Vitamin D Oral Replacement in Asthma

NCT03686150
View directory record Official record
Conditions
Asthma, Vitamin D Deficiency, Pediatric Obesity
Interventions
Vitamin D3 oral regimen
Dietary Supplement
Lead sponsor
IDeA States Pediatric Clinical Trials Network
Network
Eligibility
6 Years to 17 Years
Enrollment
112 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
15
States / cities
Little Rock, Arkansas • Wilmington, Delaware • Honolulu, Hawaii + 12 more
Source: ClinicalTrials.gov public record
Updated Apr 18, 2023 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Not applicable Interventional

Evaluating the Cost Effectiveness of STEADI

NCT05390736
View directory record Official record
Conditions
Accidental Fall
Interventions
Gait and balance assessment, Medication review, Comorbidity review, Fall history, Assessment of feet/footwear, Assessment of visual acuity, Home safety risk assessment, Vitamin D Deficiency
Behavioral
Lead sponsor
National Opinion Research Center
Other
Eligibility
65 Years and older
Enrollment
780 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 8, 2023 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 4 Interventional Results available

Study of the Effect of Velaglucerase Alfa (VPRIV®) on Bone-related Pathology in Treatment-naïve Participants With Type 1 Gaucher Disease

NCT02574286
View directory record Official record
Conditions
Gaucher Disease
Interventions
Velaglucerase alfa, Vitamin D
Drug · Dietary Supplement
Lead sponsor
Shire
Industry
Eligibility
18 Years to 70 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
8
States / cities
Beverly Hills, California • Los Angeles, California • Atlanta, Georgia + 5 more
Source: ClinicalTrials.gov public record
Updated Jan 31, 2022 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Early Phase 1 Interventional

Effect of Vitamin D After Application With Valchlor

NCT02968446
View directory record Official record
Conditions
Skin Irritation
Interventions
4 placebo, 4 Vitamin D, Valchlor
Dietary Supplement · Drug
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 22, 2021 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Vitamin D to ENhance TraUma REcovery

NCT05458024
View directory record Official record
Conditions
Musculoskeletal Pain
Interventions
Vitamin D 2, Vitamin D2 Placebo
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 65 Years
Enrollment
71 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
4
States / cities
Worcester, Massachusetts • St Louis, Missouri • Camden, New Jersey + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 27, 2025 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 1 Interventional

Pharmacokinetics and Safety Pilot Study of Single-Dose Oral and Intravenous CTAP101 in Stage 3 and 4 Chronic Kidney Disease Subjects

NCT00888069
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions
CTAP101 Capsules, CTAP101 Injection
Drug
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
12
States / cities
Peoria, Arizona • Evergreen Park, Illinois • Springfield, Massachusetts + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 29, 2014 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Vitamin D Supplementation in Breastfeeding Women

NCT01240265
View directory record Official record
Conditions
Vitamin D Deficiency, Rickets, Infant Nutrition Disorders
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
Mayo Clinic
Other
Eligibility
1 Month to 50 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Apr 29, 2013 · Synced Sep 2, 2026, 2:15 PM EDT
Withdrawn Phase 2 Interventional

Immunotherapy Before Transplantation for Skin Cancer Prevention in Organ Transplant Recipients

NCT04329221
View directory record Official record
Conditions
Cutaneous Squamous Cell Carcinoma, Actinic Keratoses, Skin Cancer, Organ Transplant Recipients, Immunotherapy
Interventions
Calcipotriol Only Product in Cutaneous Dose Form, Vaseline, Topical 5FU
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
50 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
2
States / cities
Boston, Massachusetts • St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 6, 2025 · Synced Sep 2, 2026, 2:15 PM EDT
Active, not recruiting Phase 2 Interventional

RANKL Inhibition and Mammographic Breast Density

NCT04067726
View directory record Official record
Conditions
Dense Breasts
Interventions
Denosumab, Placebo, Calcium, Vitamin D3, Core needle biopsy, Blood draw
Drug · Procedure
Lead sponsor
Washington University School of Medicine
Other
Eligibility
40 Years and older · Female only
Enrollment
210 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 30, 2026 · Synced Sep 2, 2026, 2:15 PM EDT
Terminated Not applicable Interventional

High Dose Vitamin D Replacement in Patients Undergoing Hematopoietic Stem Cell Transplantation

NCT02876822
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D
Dietary Supplement
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
Not listed
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 19, 2020 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of Vitamin D Therapy on Glucose Homeostasis in Obese Adolescents

NCT02414529
View directory record Official record
Conditions
Vitamin D Deficiency
Interventions
Vitamin D2, Placebo
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
12 Years to 18 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 16, 2017 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Evaluating the Effect of SOLIUS UV Light Source in Improving Vitamin D Status

NCT04780776
View directory record Official record
Conditions
Vitamin D Deficiency, Vitamin D Insufficiency
Interventions
UVB treatment, Sham comparator
Device
Lead sponsor
Boston University
Other
Eligibility
22 Years and older
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 21, 2024 · Synced Sep 2, 2026, 2:15 PM EDT
Active, not recruiting Phase 2Phase 3 Interventional

Setrusumab vs Placebo for Osteogenesis Imperfecta

NCT05125809
View directory record Official record
Conditions
Osteogenesis Imperfecta
Interventions
Setrusumab, Placebo
Biological · Other
Lead sponsor
Ultragenyx Pharmaceutical Inc
Industry
Eligibility
5 Years to 25 Years
Enrollment
183 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
23
States / cities
Little Rock, Arkansas • Los Angeles, California • Sacramento, California + 20 more
Source: ClinicalTrials.gov public record
Updated Feb 24, 2026 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Not applicable Interventional

Correlation Between Vitamin D Status and Bone Mineral Density in Patients With Hemophilia

NCT01090206
View directory record Official record
Conditions
Hemophilia A, Hemophilia B, Vitamin D Deficiency
Interventions
Vitamin D and calcium
Dietary Supplement
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
2 Years to 21 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 28, 2016 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 1 Interventional

Cord Blood Plus Vitamin D and Omega 3s in T1D

NCT00873925
View directory record Official record
Conditions
Type 1 Diabetes
Interventions
Autologous UCB, Omega 3 FA, Vitamin D
Biological · Dietary Supplement
Lead sponsor
University of Florida
Other
Eligibility
1 Year to 18 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Apr 3, 2013 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Study of Vitamin D in Children With Sickle Cell Disease

NCT01276587
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
Vitamin D3
Drug
Lead sponsor
Gary M Brittenham, MD
Other
Eligibility
3 Years to 20 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 11, 2023 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 1 Interventional

Ultra-high Dose Vitamin D for HSCT

NCT03759262
View directory record Official record
Conditions
Hematopoietic Stem Cell Transplant
Interventions
Cholecalciferol
Drug
Lead sponsor
Children's Hospital Los Angeles
Other
Eligibility
0 Years to 25 Years
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated May 19, 2024 · Synced Sep 2, 2026, 2:15 PM EDT
Terminated Phase 3 Interventional

A Phase III Study to Investigate if the Study Drug Diamyd Can Preserve Insulin Production and Improve Glycemic Control in Patients Newly Diagnosed With Type 1 Diabetes

NCT05018585
View directory record Official record
Conditions
Type 1 Diabetes Mellitus
Interventions
Recombinant human glutamic acid decarboxylase (rhGAD65) formulated in Alhydrogel®, Colecalciferol 2000 IU, Placebo
Biological · Dietary Supplement
Lead sponsor
Diamyd Medical AB
Industry
Eligibility
12 Years to 28 Years
Enrollment
321 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
13
States / cities
Newport Beach, California • Palo Alto, California • San Diego, California + 10 more
Source: ClinicalTrials.gov public record
Updated Aug 25, 2026 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 4 Interventional

Pharmacokinetic Comparison of Vitamin's D2 and D3 in Stage 5 Chronic Kidney Disease Patients on Chronic Hemodialysis

NCT01675557
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Vitamin D3, Vitamin D2, Placebo
Dietary Supplement
Lead sponsor
Creighton University
Other
Eligibility
20 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Feb 25, 2015 · Synced Sep 2, 2026, 2:15 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Standard Process Heart and Gut Health Study

NCT05795946
View directory record Official record
Conditions
Nutrition, Healthy
Interventions
Whole food-based B and D vitamins
Dietary Supplement
Lead sponsor
Standard Process Inc.
Industry
Eligibility
25 Years to 80 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Kannapolis, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 9, 2025 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Clearance of 25-hydroxyvitamin D in Cystic Fibrosis

NCT03104855
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
d6-25-hydroxyvitamin D3
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2023
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Oct 11, 2023 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Early Phase 1 Interventional

RANKL Inhibition and Breast Tissue Biomarkers

NCT03629717
View directory record Official record
Conditions
Breast Cancer Prevention, Mammographic Density
Interventions
Ultrasound-guided core needle biopsy, Denosumab, Blood draw, Calcium, Vitamin D
Procedure · Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
35 Years and older · Female only
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Oct 15, 2024 · Synced Sep 2, 2026, 2:15 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Does Vitamin C Increase the Body Heat Generated By The Nervous System?

NCT07341308
View directory record Official record
Conditions
Metabolism Changes, Vitamin D
Interventions
Vitamin C
Other
Lead sponsor
Colorado State University
Other
Eligibility
18 Years to 40 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Sep 2, 2026, 2:15 PM EDT
Completed Phase 1 Interventional

Comparison of I.V. CTAP201 and Doxercalciferol (Hectorol) in Subjects With Chronic Kidney Disease (CKD) and Secondary Hyperparathyroidism (SHPT)

NCT00792857
View directory record Official record
Conditions
Chronic Kidney Disease, Secondary Hyperparathyroidism, Chronic Renal Insufficiency, Chronic Renal Failure
Interventions
CTAP201 Injection, Doxercalciferol
Drug
Lead sponsor
OPKO IP Holdings II, Inc.
Industry
Eligibility
18 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
6
States / cities
Peoria, Arizona • Springfield, Massachusetts • Cincinnati, Ohio + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2014 · Synced Sep 2, 2026, 2:15 PM EDT