Sodium benzoate

Sodium benzoate (E211) is an authorised preservative in the EU and UK, and additives are only listed after an EFSA safety assessment. EFSA’s 2016 re-evaluation set a group acceptable daily intake of 5 mg per kg body weight per day (expressed as benzoic acid), judged its toxicity to be low, and found no concern for genotoxicity or carcinogenicity. EFSA did note that some children who regularly drink flavoured soft drinks can exceed this ADI.

Sodium benzoate is an antimicrobial preservative that inhibits yeasts, moulds and bacteria, and it works best in acidic products. That is why it is common in soft drinks and fruit juices, pickles, sauces, salad dressings and other condiments. It appears on labels as E211 or “sodium benzoate,” usually with the word “preservative.”

It can under certain conditions. When benzoate salts and ascorbic acid (vitamin C) are both present, small amounts of benzene can form, a reaction accelerated by heat and light. In FDA testing only a small number of beverages exceeded the 5 ppb drinking-water reference level, and all were reformulated or discontinued; this is a formulation and storage issue rather than an inherent property of the preservative.

A 2007 University of Southampton study (McCann et al.) reported that mixtures of certain artificial colours plus sodium benzoate were associated with increased hyperactivity in some children. EFSA reviewed it and concluded it provided only limited evidence of a small effect, and because mixtures rather than individual additives were tested it could not be used to change the ADI. The resulting EU warning label applies to six colours, not to sodium benzoate.

EFSA’s acceptable daily intake is 5 mg per kg body weight per day, expressed as benzoic acid, covering the whole benzoate group (E210–E213). EFSA estimated that regular consumers, particularly toddlers and children who drink flavoured beverages, can exceed this ADI, especially in “brand-loyal” consumption scenarios. High intake in children is therefore the main flagged concern, rather than general toxicity for the wider population.

No. Sodium benzoate is the sodium salt of benzoic acid and is a widely used, authorised food preservative, whereas benzene is a separate, carcinogenic industrial solvent. They are chemically different substances. Small amounts of benzene can, however, form in drinks when benzoate reacts with vitamin C under heat and light, which is why manufacturers control formulation and storage.

Yes — it contains no animal-derived material. It is the sodium salt of benzoic acid, manufactured industrially. The same applies to a vegetarian diet.

Yes — the additive itself contains no gluten. A gluten-free claim belongs to the finished product, though — check the pack, not the additive.

It is the sodium salt of benzoic acid, manufactured industrially and contains no animal-derived material, so the additive itself is not inherently non-halal. Certification applies to a finished product rather than to an additive, so a halal certification mark on the pack is the authoritative signal.

EFSA considers sodium benzoate safe at permitted levels and has set an acceptable daily intake. Two things are documented: it can provoke pseudo-allergic reactions such as urticaria in a small number of sensitive people, and in acidic drinks that also contain vitamin C it can form small amounts of benzene — which is why manufacturers reformulated after regulators raised it in the mid-2000s.