http://www.nhs.uk/Conditions/vitamins-minerals/Pages/Vitamin-C.aspx
http://www.nhs.uk/conditions/vitamins-minerals/pages/other-vitamins-minerals.aspx#zinc
http://www.nhs.uk/Conditions/vitamins-minerals/Pages/Vitamin-E.aspx
http://www.askdrsears.com/topics/feeding-eating/family-nutrition/foods-to-boost-immunity/foods-that-boost-your-immune-system