NCT05863949

Brief Summary

Randomized double blind placebo controlled trial of vitamin D supplements, with or without calcium supplementation, versus placebo in reduction of recurrences in BPPV.

Trial Health

65
Monitor

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
860

participants targeted

Target at P75+ for not_applicable

Timeline
4mo left

Started Aug 2025

Status
not yet recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Progress71%
Aug 2025Sep 2026

First Submitted

Initial submission to the registry

April 28, 2023

Completed
20 days until next milestone

First Posted

Study publicly available on registry

May 18, 2023

Completed
2.2 years until next milestone

Study Start

First participant enrolled

August 1, 2025

Completed
1.1 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

September 1, 2026

Expected
Same day until next milestone

Study Completion

Last participant's last visit for all outcomes

September 1, 2026

Last Updated

June 25, 2025

Status Verified

June 1, 2025

Enrollment Period

1.1 years

First QC Date

April 28, 2023

Last Update Submit

June 20, 2025

Conditions

Keywords

bppvbenign paroxysmal positional vertigovertigodizzinessvitamin D

Outcome Measures

Primary Outcomes (1)

  • Recurrence rate of BPPV

    how many recurrences of BPPV

    1 year

Secondary Outcomes (7)

  • serum vitamin D levels (25(OH)D3)

    1 year

  • proportion of serum vitamin D normalization

    1 year

  • time to serum vitamin D normalization

    1 year

  • proportion of recurrences

    1 year

  • duration of recurrences

    1 year

  • +2 more secondary outcomes

Study Arms (2)

vitamin D +/- calcium supplementation

EXPERIMENTAL

patients given Vitamin D 1000iu daily. Also given calcium 500mg BID daily if calcium deficient.

Dietary Supplement: vitamin D +/- calcium

Placebo arm

PLACEBO COMPARATOR

patients given 3 pills of placebo daily.

Other: Placebo

Interventions

vitamin D +/- calciumDIETARY_SUPPLEMENT

vitamin D 1000iU daily +/- calcium 500mg BID daily

vitamin D +/- calcium supplementation
PlaceboOTHER

placebo pill x3 daily

Placebo arm

Eligibility Criteria

Age18 Years+
Sexall
Healthy VolunteersNo
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Age 18 years or older
  • or more distinct episodes of benign paroxysmal positional vertigo within a 12-month period on history
  • At least 1 episode diagnosed based on physical examination by trained study personnel, meeting the diagnostic criteria of the BĂ¡rĂ¡ny Society
  • Episodes separated in time, with a minimum of 1 week symptom-free between episodes
  • Serum evidence of Vitamin D deficiency, as evidenced by 25-hydroxy vitamin D level of \<75 nmol/L (\<30 ng/mL)48
  • Subject able to provide informed consent to participate in the study

You may not qualify if:

  • Potential subjects will be excluded if they
  • have another identifiable cause of vertigo identified on history or physical examination
  • have a history of allergy or medically significant adverse reaction to vitamin D or calcium carbonate
  • have a chronic medical disorder which is a contraindication to vitamin D or calcium carbonate supplementation, including uncontrolled hyperparathyroidism, nephrolithiasis, or GI malabsorption disorders
  • are on loop diuretic agents or thiazides
  • have a contraindication to routine bloodwork for study purposes, including being hospitalized with a critical illness, cellulitis at blood draw sites, or presence of vascular grafts.

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Related Publications (43)

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    PMID: 32767116BACKGROUND
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    PMID: 27386060BACKGROUND
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    PMID: 26386496BACKGROUND
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    PMID: 32759193BACKGROUND
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MeSH Terms

Conditions

Benign Paroxysmal Positional VertigoVertigoDizzinessVitamin D Deficiency

Interventions

S100 Calcium Binding Protein G

Condition Hierarchy (Ancestors)

Vestibular DiseasesLabyrinth DiseasesEar DiseasesOtorhinolaryngologic DiseasesNeurologic ManifestationsNervous System DiseasesSigns and SymptomsPathological Conditions, Signs and SymptomsSensation DisordersAvitaminosisDeficiency DiseasesMalnutritionNutrition DisordersNutritional and Metabolic Diseases

Intervention Hierarchy (Ancestors)

CalbindinsCalcium-Binding ProteinsCarrier ProteinsProteinsAmino Acids, Peptides, and ProteinsS100 Proteins

Study Officials

  • Darren Tse, MD

    Ottawa Hospita Research Institute

    PRINCIPAL INVESTIGATOR

Central Study Contacts

Darren Tse, MD

CONTACT

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
QUADRUPLE
Who Masked
PARTICIPANT, CARE PROVIDER, INVESTIGATOR, OUTCOMES ASSESSOR
Masking Details
Enrolled subjects will be blinded to their treatment assignment. Both study staff and trial investigators will be blinded to treatment assignments and will remain blinded throughout the course of the trial. Randomization (treatment assignment) will be performed via computer algorithm based on subject ID. Randomization codes will be maintained in a password protected, encrypted file available only to the single unmasked investigator at each site, in order to prevent accidental unmasking of other trial personnel. All care will be taken to ensure that the study team are kept blinded. Pills, which will be dispensed at 3-month intervals, will be indistinguishable between groups. They will be dispensed in kits that are labeled as outlined in section 6.2 Study Drug Packaging and Labeling.
Purpose
TREATMENT
Intervention Model
PARALLEL
Model Details: This is an off-label, multicenter, randomized, clinical trial in vitamin D deficient adults aged 18 and above with recurrent BPPV. Its goal is to determine whether vitamin D supplementation, with or without calcium supplementation, compared with placebo will decrease the frequency of recurrent episodes of BPPV. A total of 860 vitamin D deficient adults diagnosed with recurrent BPPV will be enrolled at participating clinical study sites.
Sponsor Type
OTHER
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
Physician

Study Record Dates

First Submitted

April 28, 2023

First Posted

May 18, 2023

Study Start

August 1, 2025

Primary Completion (Estimated)

September 1, 2026

Study Completion (Estimated)

September 1, 2026

Last Updated

June 25, 2025

Record last verified: 2025-06

Data Sharing

IPD Sharing
Will not share