What we found
Not on Japan's approved food additive list (reportedly because no manufacturer has sought approval, not a safety-based ban). Peer-reviewed animal studies show immune-cell suppression at high doses.
Source: NIH / PubMed ↗By product type
In foodCaution
Synthetic antioxidant (tert-butylhydroquinone) that keeps fats and oils from going rancid. Caution: permitted with a concentration limit of 0.02% of the fat or oil content (21 CFR 172.185) and maximum levels as E319 in the EU.
In cosmeticsCaution
In cleaning productsCaution
Also labeled as: Tertiary Butylhydroquinone
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