• Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention                                                                                 article                   
  scientific reference

• Vitamin D 'triggers and arms' the immune system                   article                  scientific reference  
• Vitamin D3 supplementation during the winter may reduce the incidence of influenza A, especially in specific subgroups of schoolchildren                                          article                  scientific reference

2009

• Low Vitamin D Levels Linked To Proliferation of H1N1             article                  scientific reference

2006

• Epidemic influenza and vitamin D; UV light/cod liver oil reduce incidence of viral respiratory infections                                                                                   article                   scientific reference