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E520Anti-caking agentModerate concern
Aluminium Sulfate
In plain words
The short version
Alum — historically used to firm pickles and egg whites, now restricted in EU food use.
Why we flag it amber
It's permitted and generally considered safe, but there are a few reasons to be mindful — like sensitivities in some people, debated studies, or intake limits. The Safety section below explains the specifics.
Safety profile
ADI of 0–1 mg/kg body weight (combined aluminium, EFSA 2008). Aluminium absorption from soluble forms (sulfates, lakes) is higher than from metallic or insoluble forms — drives the more restrictive limits.
The detail
Educational information only. Not medical or dietary advice.