Whenever I want to know about safety rules for food chemicals in Europe, I go to the European Food Safety Authority website (efsa.europa.eu). I don’t live on the continent myself, but I haven’t yet seen any reports stating that EFSA has recommended that benzoic acid is banned. In fact, they say that the chemical has low toxicity (as long as the safe amount isn’t exceeded). The website has a search box to help visitors explore the site.
If you do further research, it would be helpful to know the relevant E numbering system that’s used in Europe. Benzoic acid is E 210, sodium benzoate E 211, potassium benzoate E 212, and calcium benzoate E 213.