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Vitamin D Deficiency: full-pipeline trial registry
5 of 49 indexed Vitamin D Deficiency trials are currently recruiting.
Corpus placement: #281 of 28,707 conditions by registered trial count.
49 US clinical trials · 5 currently recruiting · #281 of 28,707 conditions by registered trial count
Vitamin D Deficiency: 49 US clinical trials tracked, 5 recruiting.
Vitamin D Deficiency is the subject of 49 registered US clinical trials on ClinicalTrials.gov, 5 of them currently open to new participants. 9 are in Phase 3-4 (later-stage) and 10 in Phase 1-2 (earlier-stage). The most active sponsor is University of Massachusetts, Worcester, running 2 of these trials.
Enrollment posture brief
Registry condition vitamin-d-deficiency
OPEN 5 | RECR 10% | LATE 9 | EARLY 10 | RANK #281 | SPON 2
Volume-matched condition peers
Nearest open-share peer: Angina Pectoris (10% recruiting · 10 trials)
Vitamin D Deficiency lists 5 open slots (10% of 49 indexed trials). Peers are matched on registered volume, not therapeutic-area browse lists. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Vitamin D Deficiency on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Vitamin D Deficiency is recruiting below its size-band peers.
5 of 49 indexed trials (10.2%) are open to enrollment, against a 39.7% average across 762 conditions with 20-99 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
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Sponsorship of Vitamin D Deficiency trials is spread across many organizations.
University of Massachusetts, Worcester accounts for 2 of 49 trials (4.1%). 40 distinct sponsors appear on at least one study for this condition label.
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Most Vitamin D Deficiency trials plan to enrol fewer than 100 people.
Median target enrolment is 68 among the 49 trials that report a genuine target (sentinel values excluded). 33 of those (67.3%) plan for fewer than 100 participants.
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Vitamin D Deficiency research is mostly interventional.
42 interventional and 7 observational studies make up this index (85.7% interventional). Study type is sponsor-reported on ClinicalTrials.gov.
Open and recent trials
49 total, page 1 of 1
Vitamin A Supplementation in Allogeneic Stem Cell Transplantation.
Children's Hospital Medical Center, Cincinnati
NCT06450925
Evaluation of the Clinical and Psychological Impact of Vitamin D Replacement in Adolescent Females at Risk for Polycystic Ovarian Syndrome (PCOS)
Yale University
NCT04355572
High Dose Interval Vitamin D Supplementation in Patients With Inflammatory Bowel Disease Receiving Biologic Therapy
Boston Children's Hospital
NCT04331639
Randomized Trial of Enteral Vitamin D Supplementation in Infants < 28 Weeks Gestational Age or <1000 Grams Birth Weight
The University of Texas Health Science Center, Houston
NCT05694689
Impact of Vitamin D Supplementation on the Rate of Pathologic Complete Response in Vitamin D Deficient Patients
Wake Forest University Health Sciences
NCT04677816
Emulated Study of Vitamin D Correction Vs Non-Correction
The Cooper Health System
NCT06366776
Preoperative Correction of Vitamin D Deficiency in Total Joint Arthroplasty (TJA)
University of Miami
NCT07006714
ViDES Trial (Vitamin D Extra Supplementation)
The University of Texas Health Science Center, Houston
NCT05459298
High-dose Vitamin D Supplements in Older Adults
University of California, Davis
NCT03613116
Vitamin D Supplementation in the Prevention and Mitigation of COVID-19 Infection
Medical University of South Carolina
NCT04482673
Vitamin D Sulfates in Breastmilk
Mayo Clinic
NCT06203041
Vitamin D and Immune Mechanisms of Hypertension in Type 2 Diabetics
Washington University School of Medicine
NCT03348280
Effects of Vitamin D Insufficiency in Man
University of California, Los Angeles
NCT01848236
Hypovitaminosis D in Neurocritical Patients
University of Utah
NCT02881957
Epidemiological Analysis of Vitamin D and Breast Cancer Risk in Saudi Arabian Women
University of Arizona
NCT01817231
Vitamin D and Vascular Health in Children
University of Pittsburgh
NCT01797302
Optimization of Blood Levels of 25(OH)-Vitamin D in African Americans
Louisiana State University Health Sciences Center Shreveport
NCT04939792
Optimizing Vitamin D Nutrition in Healthy Adults
Winthrop University Hospital
NCT00327847
Vitamin D in Vulnerable Adults (VIVA-VA)
VA Office of Research and Development
NCT01170273
Vitamin D Replacement After Kidney Transplant
University of Nebraska
NCT00748618
Vitamin D Oral Replacement in Asthma
IDeA States Pediatric Clinical Trials Network
NCT03686150
Safety of Vitamin D Supplementation in Older Persons
University of Miami
NCT00681590
Vitamin D Supplementation for Extremely Preterm Infants
University of Alabama at Birmingham
NCT01600430
hCAP18 Levels and Vitamin D Deficiency in Healthy Subjects
Massachusetts General Hospital
NCT00742235
Vitamin D Repletion in Coronary Artery Disease
Seth I. Sokol, M.D.
NCT01570309
Vitamin D Levels and Vitamin D Education in Geriatric Patients
University of Colorado, Denver
NCT00273611
The Effect of Vitamin D Statues on Endothelial Function
University of Wisconsin, Madison
NCT01049048
Vitamin D Increases Serum Levels of the Soluble Receptor for Advanced Glycation End Products in Women With PCOS
Maimonides Medical Center
NCT03644212
Vitamin D for Sickle-cell Respiratory Complications
Gary M Brittenham, MD
NCT01443728
Evaluating the Effect of SOLIUS UV Light Source in Improving Vitamin D Status
Boston University
NCT04780776
Identifying Vitamin D Deficiency in Very Low Birth Weight Infant (VLBW) Infants Part 2
Medical University of South Carolina
NCT01363167
Characterization of Hyperparathyroidism and Vitamin D Deficiency in Obesity
Weill Medical College of Cornell University
NCT00288873
Baseline Vitamin D Deficiency and COVID-19 Disease Severity
Parkview Medical Center
NCT04628000
Evaluate the Change in Iron, Vitamin D, and C-Reactive Protein Level (CRP) in a 12 to 24 Week Period
Avera McKennan Hospital & University Health Center
NCT01328704
A Randomized Phase IV Control Trial of Single High Dose Oral Vitamin D3 in Pediatric Patients Undergoing HSCT
Phoenix Children's Hospital
NCT03176849
Vitamin D Deficiency and Low Bone Mineral Content in Children
University of Massachusetts, Worcester
NCT00756899
Effects of Vitamin D-Enriched Mushrooms on Vitamin D Status and Immune Function and Inflammatory Status in Adults
Purdue University
NCT05559112
Cholecalciferol (Vitamin D3) Therapy in Chronic Kidney Disease (CKD) Subjects
Atlanta VA Medical Center
NCT00427037
African American Children, Glycemic Control, and Type 2 Diabetes
University of Alabama at Birmingham
NCT01325987
Does Supplementing Vitamin D Deficiency Affect Fusion Healing Rates in Elective Foot and Ankle Surgery?
Allegheny Singer Research Institute (also known as Allegheny Health Network Research Institute)
NCT04450199
Vitamin D Replacement Using Oral Thin Film (OTF) Cholecalciferol in Patients Undergoing Hematopoietic Stem Cell Transplantation
Children's Hospital Medical Center, Cincinnati
NCT04818957
Correlation Between Vitamin D Status and Bone Mineral Density in Patients With Hemophilia
Virginia Commonwealth University
NCT01090206
Does Treatment of Hypovitaminosis D Increase Calcium Absorption?
University of Wisconsin, Madison
NCT00581828
Ultraviolet Light And Vitamin D In Subjects With Fat Malabsorption Or After Gastric Bypass Surgery
Boston University
NCT01910792
Effect of Vitamin D Supplementation on Endothelial Function in Obese Adolescents
Mayo Clinic
NCT01746264
Vitamin D and Adipose Tissue Inflammation
Fred Hutchinson Cancer Center
NCT01477034
Hepatic Dysfunction, Vitamin D Status, and Glycemic Control in Diabetes
University of Massachusetts, Worcester
NCT02132442
Efficacy of Vitamin D Supplementation in Obese Children
Columbia University
NCT02956408
Vitamin D for Muscle Metabolic Function in Cancer Cachexia
David Travis Thomas
NCT03144128
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 4 |
| Phase 2 | 6 |
| Phase 3 | 3 |
| Phase 4 | 6 |
Top Sponsors
Named interventions
Most-linked intervention names on Vitamin D Deficiency records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Vitamin D Deficiency trials. A trial with sites in several states counts in each.
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
Related
What to do with this Vitamin D Deficiency page
49 registered trials, 5 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 5 Vitamin D Deficiency trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- University of Massachusetts, Worcester sponsors the most Vitamin D Deficiency trials on record, review their full trial history before evaluating a specific study. See University of Massachusetts, Worcester's trials
- Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide
Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Vitamin D Deficiency condition card totals 49 registered trials; most-linked intervention Vitamin D3; top US site state New York. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.