Germans found that Vitamin D increases the immune system by 3-5 times and is BETTER than any vaccine at helping the immune system beat the h5n1 (bird flu) virus. See 2:20 Research from PubMed: In 1981, R. Edgar Hope-Simpson proposed that a 'seasonal stimulus' intimately associated with solar radiation explained the remarkable seasonality of epidemic influenza. Solar radiation triggers robust seasonal vitamin D production in the skin; vitamin D deficiency is common in the winter, and activated vitamin D,
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