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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
QUADRUPLE
Enrollment
569
800-6000 IU cholecalciferol per day
University of Tromsø
Tromsø, Tromsø, Norway
influenza during the winter season 2009/2010
Time frame: up to 30 weeks
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