Benzoate is a preservative found in foods, drinks, beauty products and other household items which can cause a contact allergic reaction.
Sodium benzoate does not occur naturally in food, but benzoic acid is found in prunes, cinnamon, cloves, tea, tomatoes, plums, apples and cranberries.
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Benzoate.php
The allergy resources page for benzoate covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with benzoate.
There is also regularly updated links to useful websites specifically for benzoate allergies and the latest research papers on the topic.
If you have multiple allergies and are interested in how they are linked or want to find out more about food allergies outside the usual top 14 then you can follow me on Facebook or Twitter, where I share a food allergy card every day of the week.