Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Vitamin D Insufficiency: later-stage trial registry
1 of 4 indexed Vitamin D Insufficiency trials are currently recruiting, with more weight in Phase 3-4.
Corpus placement: #4,115 of 28,707 conditions by registered trial count.
4 US clinical trials · 1 currently recruiting · #4,115 of 28,707 conditions by registered trial count
Vitamin D Insufficiency: 4 US clinical trials tracked, 1 recruiting.
Vitamin D Insufficiency is the subject of 4 registered US clinical trials on ClinicalTrials.gov, 1 of them currently open to new participants. 1 are in Phase 3-4 (later-stage) and 0 in Phase 1-2 (earlier-stage). The most active sponsor is US Department of Veterans Affairs, running 1 of these trials.
Enrollment posture brief
Registry condition vitamin-d-insufficiency
OPEN 1 | RECR 25% | LATE 1 | EARLY 0 | RANK #4115 | SPON 1
Volume-matched condition peers
Nearest open-share peer: Abdominal Cancer (25% recruiting · 8 trials)
Vitamin D Insufficiency lists 1 open slots (25% of 4 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 Insufficiency 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 Insufficiency is recruiting below its size-band peers.
1 of 4 indexed trials (25%) are open to enrollment, against a 46.5% average across 27,806 conditions with fewer than 20 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
Open and recent trials
4 total, page 1 of 1
Vitamin D Homeostasis in Sarcoidosis
University of Texas Southwestern Medical Center
NCT03621553
D Vitamin Intervention in VA
US Department of Veterans Affairs
NCT01375660
Vitamin D Levels and Vitamin D Education in Geriatric Patients
University of Colorado, Denver
NCT00273611
Evaluating the Effect of SOLIUS UV Light Source in Improving Vitamin D Status
Boston University
NCT04780776
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 4 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Vitamin D Insufficiency records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Vitamin D Insufficiency 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 Insufficiency page
4 registered trials, 1 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 1 Vitamin D Insufficiency trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- US Department of Veterans Affairs sponsors the most Vitamin D Insufficiency trials on record, review their full trial history before evaluating a specific study. See US Department of Veterans Affairs'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 Insufficiency condition card totals 4 registered trials; most-linked intervention Placebo; top US site state Texas. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.