There is mounting evidence and research that Vitamin D3 is a powerhouse for immunity including influenza prevention i.e. Swine Flu, etc...Some studies are demonstrating that Vitamin D3 supplementation works much better than a flu shot. Please go to ...the Vitamin D council website and sign up for email updates on this vitamin that so many Americans are deficient in.

The Vitamin D council is run by Dr. John Cannell, MD, an expert in Vitamin D: http://www.vitamindcouncil.org/