Sodium Benzoate and other benzoates are often found as food additives in industrially processed foods and drinks.
Common in milk products, cheeses, drinks, sodas, etc ...
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Huge number of people react to benzoates without ever knowing what they react to .... some of them become vegans, and all of the symptoms are gone ... but not because of vegan diet, rather because they stop consuming industrially processed foods with benzoates , and sometimes meat with nitrates and nitrites ....