What is E211? (Food Additive Explained)
E211 is sodium benzoate — a preservative widely used in soft drinks, sauces, and pickled foods. It's effective at preventing bacterial growth in acidic products, but has attracted concern because it can form benzene (a carcinogen) when combined with vitamin C (ascorbic acid).
What is E211?
Full name: Sodium Benzoate
E211 is the sodium salt of benzoic acid. Benzoic acid occurs naturally in some foods — cranberries, plums, and cinnamon all contain small amounts. As a food additive, sodium benzoate is produced synthetically and is one of the most widely used preservatives in the beverage industry. It dissolves in water more readily than benzoic acid (E210), making it the preferred form for drinks and liquid products.
What does E211 do in food?
E211 prevents the growth of bacteria, yeasts, and moulds in acidic foods and drinks. It's most effective at pH levels below 4.5, which is why it's used heavily in soft drinks, fruit juices, pickles, and condiments. It's particularly important in drinks that contain sugar — without a preservative, these would quickly become breeding grounds for microorganisms.
Where is E211 found?
E211 is commonly found in:
- Soft drinks and carbonated beverages
- Fruit juices and squash
- Salad dressings and sauces
- Pickles and pickled vegetables
- Jams, preserves, and fruit fillings
- Medicines and cough syrups
Is E211 bad for you?
E211 is approved by EFSA with an ADI of 5 mg/kg body weight per day. On its own, it's considered safe at normal dietary levels. However, there's a well-documented concern: when sodium benzoate is combined with ascorbic acid (vitamin C / E300) in acidic conditions, it can form benzene — a known carcinogen. In 2006, the UK Food Standards Agency found benzene levels above safe limits in some soft drinks, leading to product recalls. The industry has largely reformulated to avoid this combination, but it remains a concern. E211 was also included in the Southampton study mixtures linked to hyperactivity in children.
Why E211 matters for food choices
E211 is a significant additive to be aware of. Its interaction with vitamin C demonstrates that food additives don't exist in isolation — combinations matter. Under the NOVA classification, preservatives like E211 are markers of ultra-processed food. Its heavy use in soft drinks and cheap sauces means it's predominantly found in NOVA Group 4 products. Checking for E211 alongside the rest of the ingredient list gives you a clearer picture of how industrially produced a food really is.
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