Preservatives
Benzoic acid
Definition
What it is
Benzoate preservative: linked to hyperactivity in children; reacts with vitamin C (ascorbic acid) to form benzene, a known carcinogen, in soft drinks.
On the label
How it appears on labels
- benzoic acid
Regulation
Regulatory status
No bans or restrictions are recorded for this ingredient in the jurisdictions clearlabel tracks (US, EU, UK, Canada, Japan, Australia/NZ, Brazil).
Explainer
In plain language
Benzoic acid is a preservative used to stop the growth of mold, yeast, and some bacteria in acidic foods and drinks. It occurs naturally in small amounts in some fruits like cranberries, but the food-additive version is manufactured. It is closely related to sodium benzoate, its more soluble salt form, and both do the same preservative job.
Assessment
Why it is flagged
Two separate concerns drive the flag. First, when benzoic acid or benzoate sits alongside vitamin C (ascorbic acid) in a drink, the two can react to form benzene, a compound classified as a known human carcinogen, especially with heat or light exposure. The FDA studied this in soft drinks in the 2000s and worked with manufacturers to reformulate products where benzene levels were elevated. Second, benzoates were among the preservatives in the 2007 Southampton study that associated additive mixtures with increased hyperactivity in some children. The benzene issue is a real chemical reaction rather than a hypothetical, but it depends on specific conditions, so Clear Label flags benzoic acid for transparency about where those conditions can occur.
In the aisle
Where it commonly shows up
- Soft drinks and fruit-flavored sodas
- Fruit juices and juice drinks
- Pickles and pickled vegetables
- Salad dressings and condiments
- Jams, syrups, and fruit preserves
- Some sauces and fermented products
Practical
Reading the label
It appears as benzoic acid or as sodium benzoate, potassium benzoate, or calcium benzoate. In the EU these carry E-numbers E210 to E213. The benzene risk is highest when a benzoate and vitamin C or citric acid appear together in the same drink, so scanning for both is worth doing.
Alternatives
If you want to avoid it
Some people choose refrigerated drinks and dressings that rely on cold storage instead of chemical preservatives, or products that use sorbates. Freshly squeezed juices and homemade dressings avoid the benzoate and vitamin C combination entirely.
FAQ
Common questions
Does every drink with benzoate contain benzene?
No. Benzene only forms when a benzoate is present together with vitamin C under certain conditions like heat or light. The FDA found most tested drinks had low levels, and many manufacturers reformulated the products that did not.
Is benzoic acid the same as sodium benzoate?
They are closely related. Sodium benzoate is the salt of benzoic acid and dissolves more easily, so it is the more common form in drinks. Both carry the same preservative role and the same benzene consideration when combined with vitamin C.
Why do some parents watch it?
Benzoates were part of the additive mixtures in the 2007 Southampton study that observed increased hyperactivity in some children. Sensitivity varies from child to child, so logging foods and behavior over time is the honest way to see whether it matters for a given household.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.