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E579ColorantLow concern
Ferrous Gluconate
In plain words
The short version
An iron(II) gluconate — the blackening agent for cured black olives.
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 — considered safe at typical use levels. The iron contribution to the daily diet from olive blackening is small. Pharmaceutical doses (15–60 mg iron daily for anemia) are much higher than dietary additive levels.
The detail
Educational information only. Not medical or dietary advice.