We know that most people are deficient in Vitamin D3. Vitamin D is vital to building immunity. This is one reason why cod liver oil, high in Vitamins D and A, is so good for immunity against colds, flus and other viruses. I have wanted to post a few of the best articles I have seen on this topic, but for now, this amazing 6-minute video called The Miracle of Vitamin D, will have to do. More to come.
See a thorough paper on the Miracle of Vitamin D at the Weston A. Price Foundation.