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Furthermore, it appears that to work at its best the immune system needs vitamins C, D and E together with zinc and selenium in excess of amounts that can usually be achieved through diet alone
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Because vitamin A is toxic in high doses, taking too much in the form of supplements can be dangerous
PMID: 24717514 View source Ulanovskaya OA, et al
These nutrients were chosen because they have the most research supporting their benefits
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