E579: Ferrous gluconate
What it does
Gives a black colour to ripe olives; an iron source.
What it is made from
Made from gluconic acid and iron.
Allergies and diets
No allergy or diet concern is recorded for this additive. That is not a guarantee: the source can differ between makers, so check the label.
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General information, not medical advice. Sources differ between manufacturers: check the label or ask the maker.
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