TBHQ
The short version
Tertiary butylhydroquinone — a potent synthetic antioxidant common in fried snacks and frozen foods, with some safety debates.
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 0–0.7 mg/kg body weight (JECFA). Banned in Japan and some EU member-state derogations for specific products. Animal studies at high chronic doses have shown forestomach lesions; the human relevance is debated. A 2021 paper in the International Journal of Environmental Research and Public Health, based on ToxCast screening data and published animal and cell studies, reported that TBHQ was active in immune-related assays and suggested that it may affect the immune response in people.
Sources
- WHO JECFA database — tert-Butylhydroquinone (TBHQ), INS 319 (evaluation 1997, 49th meeting) — World Health Organization / JECFA, 1997. ADI 0–0.7 mg/kg bw (JECFA)
- US eCFR — 21 CFR 172.185 TBHQ — US FDA / Office of the Federal Register (eCFR), 2026. Permitted in the US as a food additive (antioxidant), max 0.02% of fat/oil content
- European Commission food additives database — Tertiary-butyl hydroquinone (TBHQ), E 319 (Union list, Regulation (EC) No 1333/2008 Annex II) — European Commission, DG SANTE, 2026. Permitted in the EU (within group E 310–320 limits)
- Naidenko et al. — Investigating Molecular Mechanisms of Immunotoxicity and the Utility of ToxCast for Immunotoxicity Screening of Chemicals Added to Food, Int J Environ Res Public Health 18(7):3332 (2021), doi:10.3390/ijerph18073332 — MDPI (via PubMed Central), 2021. The 2021 paper on possible immune effects of TBHQ
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