Check out the article below on how Vitamin D is far more effective in helping the flu. But, in addition to helping the flu, look at the other benefits that Vitamin D supplementation can achieve. As always, I don’t encourage going to the supermarket or places like that. Find quality products! That is why I personally endorse and use Nutri-West.
http://www.naturalnews.com/029760_vitamin_D_influenza.html