Vitamin D and the Influenza Epidemic

Status

Completed

Phases

Phase 3

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT01182870

Enrollment

569

Registered

2010-08-17

Start date

2010-04-30

Completion date

2010-10-31

Last updated

2011-07-20

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Influenza

Keywords

vitamin D, influenza, prevention

Brief 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.

Interventions

DRUGcholeclaciferol

800-6000 IU cholecalciferol per day

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

PREVENTION

Masking

QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

20 Years to 80 Years

Healthy volunteers

Yes

Inclusion criteria

* participant in vitamin D versus placebo study

Exclusion criteria

* none

Design outcomes

Primary

Measure	Time frame
influenza during the winter season 2009/2010	up to 30 weeks

Countries

Norway

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026