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In balance, good common sense advice. However, I do have one quibble, and that is with the recommendation to include Vitamin E. There are two concerns. First, while there is evidence that vitamin E plays an immune boosting role in the body, there is little evidence that vitamin E supplementation is effective. Rather, the indication is that failing to get a sufficient quantity of vitamin E from food reduces immune system capacity. There is some concern that vitamin E is one of the vitamins that is fully effective when taken up from the diet rather than supplements.
Second, the article asserts that Vitamin E helps produce more B cells and "[t]hese B cells produce the antibodies that help destroy harmful bacteria." Even were this true, and there is no evidence that vitamin E supplementation will boost the immune system, the destruction of harmful bacteria is not relevant to an article that purports to give advise re: avoiding and/or lessening the symptoms of a cold or flu since those ailments are caused by viruses and not bacteria.
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