If one develops influenza, taking extra vitamin D can strengthen the body’s innate immune system and reduce the symptoms of influenza and risk of developing bacterial pneumonia.

We found no published studies of treating those with pneumonia with vitamin D. 

However, it is reasonable to expect that if one who develops influenza takes a large dose of vitamin D3 (e.g., 10,000 IU/day for several days), sufficient amounts of cathelicidin and defensins will be induced within a couple of days, strengthening the innate immune system’s ability to fight pneumonia. 

There is strong evidence that vitamin D reduces risk of pneumonia incidence and death.  Those wishing to reduce their risk of pneumonia should consider raising their serum 25(OH)D levels to 40 ng/mL (100 nmol/l), which could take 2000-5000 IU/day of vitamin D3.

Page last edited: 03 May 2011