I and several members of my family have a Vitamin C allergy. We break out in a rash or small water blisters from more then a daily dose of the USDA required amount. However when I am sick I can take alot more. Also after a shot of Kennalog, I can take all the Vit. C I want, at least for several months. But do not reccomend taking kennalog more then once a year, it also cures my hayfever for that amount of time

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