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Ingredient · Preservative

TBHQ (tert-Butylhydroquinone)

Mixed · 4/10, higher is cleaner

E-number E319

How we reached this

EU permitted at low limits; emerging evidence of immune-system effects in rodent models. FDA ADI 0.7 mg/kg/day.

Sources · 2

Regulatory position

European UnionPermitted with ADI 0.7 mg/kg/day (E319)
United StatesPermitted with use-level limits
NotesEmerging immune-system signal in animal models (Vandenberg et al. EHP 2012). FDA + EU both maintain ADIs. | Emerging immune-system signal in animal models (Vandenberg et al. EHP 2012). FDA + EU both maintain ADIs.

Also listed as

E319tert-butylhydroquinone

Products containing this · 3

About this rating

Ratings run 1–10, higher is cleaner, and are set editorially against the sources above — see the methodology page for how an ingredient rating becomes part of a product score. Last reviewed 2026-05-23.