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CompletedNCT01182870Updated Jul 20, 2011

Vitamin D and the Influenza Epidemic

A Phase 3 interventional study of choleclaciferol in Influenza, sponsored by University of Tromso. Completed at 1 site in Norway. Open to participants aged 20 Years to 80 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2011-07-20.

Sponsored by University of Tromso · Phase 3, Interventional, and Prevention

Phase
Phase 3
Study type
Interventional
Enrollment
569
Allocation
Randomized
Ages
20 Years to 80 Years
Sex
All
01

Study summary

Subjects included in ongoing vitamin d intervention trials were asked by questionnaire if they were ill with influenza during the winter season 2009/2010 to see if vitamin d supplementation prevented flu like disease.

02

Conditions studied

  • Influenza

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Keywords

  • vitamin D
  • influenza
  • prevention
03

In context

Influenza, Human

2,214 studies on the registry are indexed under Influenza, Human; 163 are open to participants now.

This study's enrollment of 569 is above the median of 238 across 1,853 interventional studies indexed under Influenza, Human.

Browse Influenza, Human studies →

Lead sponsor

University of Tromso is the lead sponsor of 61 studies on the registry; 7 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
20 Years to 80 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • participant in vitamin D versus placebo study

Exclusion criteria

Exclusion Criteria:

  • none
05

Study design

Phase
Phase 3
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
569 participants (actual)

Study arms

  • Experimental
    cholecalciferol

    cholecalciferol in doses 800-6000 IU per day

    Drug: choleclaciferol

  • Placebo comparator
    placebo

    placebo identical looking as cholecalciferol capsules

    Drug: choleclaciferol

Interventions

  • Drugcholeclaciferol

    800-6000 IU cholecalciferol per day

06

What researchers measure

Primary outcomes

  1. influenza during the winter season 2009/2010

    Time frame: up to 30 weeks

07

Study locations

1 site
  • University of Tromsø
    Tromsø, 9037, Norway
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 20, 2011, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT01182870
Lead sponsor
University of Tromso
First posted
Aug 17, 2010
Start date
Apr 2010
Primary completion
Sep 2010
Completion
Oct 2010
Last update
Jul 20, 2011

Study contacts

rolf Jorde, md
principal investigator · University of Tromso, Norway

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Jul 2011. You cannot join it, but the record below documents what was studied.

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