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E524AcidulantLow concern
Sodium Hydroxide
In plain words
The short version
Caustic soda — a strong base used for pH adjustment, pretzel browning, and olive curing.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI not specified — neutralized to harmless sodium salts during food processing. The pure material is highly corrosive (strong base) so it is a workplace-safety hazard, not a consumer hazard. Final food products contain only trace residual.
The detail
Educational information only. Not medical or dietary advice.