Vitamin D
Read each page linked below starting with the Wikipedia links you will be surprised at some of the research.
While the links below are leaning more on the flu and influenza side, Vitamin D deficiency may also be linked to an increased susceptibility to several chronic diseases, such as high blood pressure, tuberculosis, cancer, periodontal disease, multiple sclerosis, chronic pain, seasonal affective disorder, peripheral artery disease, cognitive impairment which includes memory loss and foggy brain, and several autoimmune diseases including type 1 diabetes, Parkinson’s disease, Rickets, Osteomalacia, and Osteoporosis
Immunomodulation
Active vitamin D hormone also increases the production of cathelicidin, an antimicrobial peptide that is produced in macrophages triggered by bacteria, viruses, and fungi. Vitamin D deficiency tends to increase the risk of infections, such as influenza and tuberculosis. In a 1997 study, Ethiopian children with rickets were 13 times more likely to get pneumonia than children without rickets. Vitamin D may also have therapeutic clinical applications in the treatment of inflammatory diseases (rheumatoid arthritis, psoriatic arthritis), dermatological conditions (psoriasis, actinic keratosis), osteoporosis, cancers (prostate, colon, breast, myelodysplasia, leukemia, head and neck squamous cell carcinoma, and basal cell carcinoma), and autoimmune diseases (systemic lupus erythematosus, type I diabetes); central nervous systems diseases (multiple sclerosis); and in preventing organ transplant rejection.
Cancer prevention and recovery
The vitamin D hormone, calcitriol, has been found to induce death of cancer cells in vitro and in vivo. The anti-cancer activity of vitamin D is thought to result from its role as a nuclear transcription factor that regulates cell growth, differentiation, apoptosis and a wide range of cellular mechanisms central to the development of cancer. These effects may be mediated through vitamin D receptors expressed in cancer cells.
Vitamin D and influenza From Wikipedia
One Hour FREE Vitamin D Lecture to Clear Up All Your Confusion on this Vital Nutrient
http://articles.mercola.com/sites/articles/archive/2008/12/16/my-one-hour-vitamin-d-lecture-to-clear-up-all-your-confusion-on-this-vital-nutrient.aspx
Avoid Flu Shots With the One Vitamin that Will Stop Flu in Its Tracks
http://articles.mercola.com/sites/articles/archive/2008/10/21/avoid-flu-shots-vitamin-d-is-a-better-way.aspx
More Evidence Vitamin D Beats the Flu
http://articles.mercola.com/sites/articles/archive/2006/10/03/more-evidence-vitamin-d-beats-the-flu.aspx
Avoid Flu Shots, Take Vitamin D Instead
http://lewrockwell.com/miller/miller27.html
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Vitamin D Resource Page
http://www.mercola.com/article/vitamin-d-resources.htm
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Sixty million years of evolution says vitamin D may save your life from swine flu
http://www.naturalnews.com/027231_Vitamin_D_immune_system_vaccines.html
Vitamin D news and articles
http://www.naturalnews.com/Vitamin_D.html
Despite Anti-Vitamin D Bias, CDC Stumbles on Deficiency Link to H1N1 Deaths
http://articles.mercola.com/sites/articles/archive/2009/09/22/Low-Vitamin-D-Increases-Flu-Death-Risk-in-Kids.aspx
Test Values and Treatment for Vitamin D Deficiency
http://articles.mercola.com/sites/articles/archive/2002/02/23/vitamin-d-deficiency-part-one.aspx
Canada Looks at Vitamin D for Swine Flu Protection
http://articles.mercola.com/sites/articles/archive/2009/08/27/Canada-Looks-at-Vitamin-D-for-Swine-Flu-Protection.aspx
Rickets (Vitamin D Deficiency) Cases Rising
http://articles.mercola.com/sites/articles/archive/2000/08/27/vitamin-d-rickets.aspx
The Depressing Truth About Vitamin D Deficiency
http://articles.mercola.com/sites/articles/archive/2006/12/30/the-depressing-truth-about-vitamin-d-deficiency.aspx
UV Exposure Only Way To Get Adequate Vitamin D
http://www.rense.com/general82/uv.htm
Discover the Pain of Vitamin D Deficiency
http://www.naturalnews.com/026966_Vitamin_D_vitamin_D_deficiency_chronic_pain.html
Urgent: What to Do If You Cannot Avoid Flu Shots or are Exposed to Virus Shedding
http://www.naturalnews.com/027106_vaccination_Vitamin_D_vaccinations.html
Valuable Insights Into the Importance of Vitamin D and Sun
http://articles.mercola.com/sites/articles/archive/2004/04/03/vitamin-d-grant.aspx
How Sunshine and Vitamin D Can Help You Eliminate Mercury
http://articles.mercola.com/sites/articles/archive/2008/12/04/how-sunshine-and-vitamin-d-can-help-you-eliminate-mercury.aspx
Vitamin D and H1N1 Swine Flu
http://www.start-up.co.nz/vitamin-d-and-h1n1-swine-flu/
Epidemic Influenza And Vitamin D
http://www.medicalnewstoday.com/articles/51913.php
Researchers see link between vitamin D, flu immunity
http://www.jsonline.com/features/health/44680902.html
http://media.journalinteractive.com/images/fluvitaminG_051109.jpg