Hello: My 85 year old mother says she is allergic to Vitamin C. When she consumes it, whether it is in any form, or high vitamin C foods, she says she itches real bad, all over. I just came upon information about how Vitamin C is very good. Is there something we can do to alleviate that allergy, so she could consume vitamin C for improving her health?? Thanks for any information you can provide. Malcolm S Knox