What is E210?
Benzoic acid — a preservative naturally found in berries and spices, but usually added to food as a synthetic ingredient with a few genuine caveats attached.
E210 is benzoic acid, a preservative that stops yeast and mould growing in acidic foods and drinks. It occurs naturally in foods like cranberries and cinnamon, but the version added to packaged food is usually made synthetically. It's permitted in Australia, the US and the EU, but it can trigger allergy-type reactions in sensitive people, and it belongs to the same benzoate family linked to a benzene-forming reaction with Vitamin C. Goodnessly rates it Avoid.
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What is benzoic acid?
Benzoic acid is an organic acid found naturally in small amounts in cranberries, prunes, plums, apples, cinnamon and cloves. Despite that natural presence, the benzoic acid used as a food additive is almost always produced synthetically, typically through an industrial process starting from toluene — it's cheaper and more consistent than extracting it from plants. It works as a preservative by penetrating microbial cells and disrupting their ability to function, but it only works well in acidic conditions (below about pH 4.5), which is why you'll mostly find it in tangy or acidic products rather than neutral-pH foods.
What's it used for?
- Preventing yeast and mould growth in acidic soft drinks and cordials
- Preserving pickles, sauces and salad dressings
- Extending shelf life in fruit juices and fruit-based products
- Preservative in some jams and condiments
- Used in some cosmetic and pharmaceutical products for the same antimicrobial effect
Where you'll find 210 on the shelf
Mostly in acidic products, where benzoic acid actually works as a preservative.
Is benzoic acid safe? What the research says
Benzoic acid is permitted everywhere, but it carries a real allergy-type reaction profile and a well-documented family concern that keeps it out of our Safe tier.
| Region | Status | What this means |
|---|---|---|
| AU/NZ Australia & New Zealand (FSANZ) | Permitted | Must be declared by name or number (210) on the ingredient list. Permitted at set maximum levels depending on the food category. |
| EU European Union (EFSA) | Permitted, ADI set | Listed as E210. EFSA's 2016 re-evaluation (covering E210, E211, E212 and E213 together) confirmed an Acceptable Daily Intake of 5mg per kilogram of bodyweight per day. |
| US United States (FDA) | GRAS | Holds Generally Recognized As Safe status, permitted at up to 0.1% of the food product. |
Benzoic acid and its salts (sodium benzoate E211, potassium benzoate E212) are effective only in acidic conditions and don't work well against bacteria, which is why they're mostly used in acidic products. In sensitive individuals, they can trigger pseudo-allergic reactions such as hives, skin rash or asthma-like symptoms.
- The benzoate-Vitamin C reaction: when combined with ascorbic acid (Vitamin C, E300) and exposed to heat or light, benzoate preservatives can form small amounts of benzene, a known carcinogen. This has been most documented for sodium and potassium benzoate (E211/E212) specifically, but benzoic acid belongs to the same chemical family and shares the underlying concern. Most major manufacturers reformulated products to avoid this combination after it drew public attention in the mid-2000s.
- Hyperactivity research: studies including the 2007 Southampton Study found that combinations of certain synthetic colours with sodium benzoate were associated with increased hyperactivity in children. This research specifically implicated the combination, not benzoic acid or benzoates used alone.
This section is checked periodically rather than continuously — if you're reading this well after the date above, it's worth confirming nothing has changed before citing it.
Who might want to limit or avoid it
- People with asthma or a history of hives, who report higher rates of pseudo-allergic reactions to benzoates
- Anyone who regularly drinks products that combine benzoic acid or a benzoate with Vitamin C, given the benzene-formation concern
- Parents monitoring their children's intake of synthetic colours and preservatives together, given the hyperactivity research on combinations
- Anyone who prefers to choose naturally preserved products where practical
Goodnessly rates E210 Avoid. It remains legally approved with a formal daily intake limit set by regulators, but the combination of documented allergy-type reactions, the shared benzoate-benzene concern, and its association with hyperactivity research places it in our highest-caution category.
How to spot it on a label
Benzoic acid must be declared clearly. Look out for:
- Benzoic acid
- 210 or E210
- "Preservative (210)" in the ingredients list
- Related benzoates: sodium benzoate (211), potassium benzoate (212)
Soft drinks, cordials and pickled products are the most common places to find it.
Related additives
Frequently asked questions
Is E210 natural or synthetic?
Both, in a sense. Benzoic acid occurs naturally in small amounts in foods like cranberries, prunes and cinnamon, but the version added to packaged food as a preservative is almost always made synthetically, typically starting from toluene, since it's cheaper and more consistent to produce that way.
Is benzoic acid the same as sodium benzoate?
No, but they're closely related. Benzoic acid (E210) is the acid form; sodium benzoate (E211) and potassium benzoate (E212) are its salts, which dissolve more easily in water. They behave very similarly as preservatives and share the same underlying safety considerations.
Can benzoic acid form benzene?
The benzene-forming reaction is most documented for sodium and potassium benzoate combined with Vitamin C (ascorbic acid) under heat or light. Benzoic acid belongs to the same chemical family and shares the underlying concern, though the specific documented cases have mostly involved its salts rather than benzoic acid itself.
Does Goodnessly rate E210 as safe, caution, or avoid?
Goodnessly rates E210 (Benzoic Acid) as Avoid. While it remains legally approved with a formal daily intake limit, the combination of documented allergy-type reactions, the shared benzoate-benzene concern, and its association with hyperactivity research places it in our highest-caution category.
Is E210 vegan?
Yes. Benzoic acid, whether naturally sourced or synthetically produced, doesn't involve animal-derived ingredients.
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