The European Food Safety Authority (EFSA) has issued an opinion on d-camphor (CAS#464-49-3). According to EFSA:
The acute exposure estimates considered by the Panel are based on observed high consumption in only one Member State and on maximum limits suggested by the Council of Europe. However, maximum permitted levels for d-camphor are not currently set in the EU legislation and there is uncertainty on its actual upper use levels in foods and beverages currently on the market and on the high consumption of food flavoured with d-camphor all over Europe. The Panel therefore suggests that maximum limits should be set to ensure that exposure to camphor does not exceed 2 mg/kg bw on a single day in any age group.