Is TBHQ safe? Where it's allowed, limited, and what it's in
Where TBHQ is allowed
United States
Permitted with conditionsFDA allows TBHQ as an antioxidant in food, alone or with BHA and/or BHT, as long as the total antioxidant content of the food does not exceed 0.02% of its oil or fat content, including the essential (volatile) oil content. The rule also requires the additive itself to be at least 99.0% pure. [1]
Canada
RestrictedTBHQ is permitted, but only in a narrow group of foods. Health Canada's List of Permitted Preservatives names fats and oils (except milk fat, olive oil and suet), lard and shortening, at up to 200 ppm alone or combined with BHA, BHT and propyl gallate. No other foods are listed for TBHQ. [2]
European Union
RestrictedTBHQ is authorised as E 319 only in listed categories, such as fats and oils for professional manufacture of heat-treated foods, frying fats, processed nuts, dehydrated potatoes, precooked cereals, cereal-based snacks, dehydrated soups and meat, and chewing gum. Limits run from 25 to 400 mg/kg depending on the food, counted together with propyl gallate and BHA (and, in chewing gum, seasonings and food supplements, BHT). [3]
What is TBHQ?
TBHQ (tertiary-butylhydroquinone, E319 in Europe) is a synthetic antioxidant that does the same job as BHA and BHT, and FDA's rule allows it to be used alone or together with them. JECFA, the joint FAO/WHO expert committee on food additives, set its intake guideline in 1997, and the European Food Safety Authority (EFSA) reviewed it in 2004 and refined its exposure estimates in 2016.
Why it's used, and where you'll find it
Oils and fats go rancid when they react with oxygen. TBHQ slows that reaction and extends shelf life. The rules that name it centre on fats and oils: Canada lists fats, oils, lard and shortening, the EU list includes frying fats, and the US limit is expressed as a share of a food's oil or fat content.
What the research and regulators say
The daily intake guideline
JECFA set an acceptable daily intake (ADI) of 0 to 0.7 mg per kg of body weight for TBHQ in 1997, and EFSA confirmed the 0.7 figure in 2004. The ADI is the daily benchmark regulators use for long-term intake. [4, 5, 8]
How much people actually eat
In 2004 EFSA concluded that adult exposure did not exceed the ADI, but that infants could exceed it if TBHQ were used in infant formula. EFSA's 2016 refined assessment found that if every food contained TBHQ at the maximum permitted level, high-intake toddlers and children would exceed the ADI; with realistic use-level data, no population group did. [5]
Early lab findings on the immune system
A 2025 mouse study reported that dietary TBHQ increased allergic sensitisation to a food protein and worsened anaphylaxis. This is an early animal finding, not evidence that TBHQ causes allergies in people, and not a regulatory conclusion. [6]
Who might choose to avoid it
The sources cited here do not single out a group who must avoid TBHQ at permitted levels, although EFSA flagged infants as exceeding the guideline if TBHQ were used in infant formula. Some people limit it because of the early animal immune findings or to avoid synthetic additives.
How to spot it on a label
Look for TBHQ, tertiary butylhydroquinone, tert-butylhydroquinone or E319. It usually appears next to the oil it protects and may be listed with BHA or BHT.
Check what's in your own productsScan a barcode or a label photo and Label X-Ray flags TBHQ and everything else in plain English, with your allergies checked automatically.
Frequently asked questions
Is TBHQ banned in Europe?
No. It is authorised as E 319, but only in a listed set of foods (fats and oils for professional heat-treated foods, frying fats, processed nuts, dehydrated potatoes, cereal-based snacks, dehydrated soups and others) with maximum levels.
Is TBHQ banned in Canada?
No. Health Canada's List of Permitted Preservatives allows TBHQ in fats and oils (except milk fat, olive oil and suet), lard and shortening at up to 200 ppm, alone or combined with BHA, BHT and propyl gallate. Those are the only foods it names for TBHQ.
What is TBHQ in crackers, popcorn and cookies?
It is an antioxidant added to the oil or fat in a product to slow rancidity. Whether a particular product contains it is shown on its ingredient list.
Is TBHQ safe to eat?
Regulators allow it within limits, using an acceptable daily intake of 0.7 mg per kg of body weight. EFSA found that with realistic use levels no population group exceeded it, though at maximum permitted levels high-intake toddlers and children could.
Is TBHQ carcinogenic?
TBHQ does not appear in IARC's current list of classified agents (data dated July 2026), so it has no IARC cancer classification there. FDA, JECFA and EFSA each allow it within set limits, which is not the same as proving zero risk.
Is TBHQ the same as BHT and BHA?
No, but all three are synthetic antioxidants that stop fats going rancid. US rules let them be used together if the total stays at or below 0.02% of the fat or oil, and Canada caps their combined amount at 200 ppm in fats, oils, lard and shortening.
Related ingredients
Sources
- U.S. eCFR (Office of the Federal Register) — 21 CFR 172.185 - TBHQ (accessed 2026-09-19)
- Health Canada — 11. List of Permitted Preservatives (Lists of Permitted Food Additives) (accessed 2026-09-19)
- EUR-Lex (European Union) — Consolidated text: Regulation (EC) No 1333/2008 on food additives (version of 18 August 2026) (accessed 2026-09-19)
- WHO/FAO JECFA — tertiary butylhydroquinone (JECFA database) (accessed 2026-09-19)
- EFSA — Statement on the refined exposure assessment of tertiary-butyl hydroquinone (E 319) (accessed 2026-09-19)
- PubMed (U.S. National Library of Medicine) — The transcription factor Nrf2 links Th2-mediated experimental allergy to food preservatives (accessed 2026-09-19)
- IARC — IARC Monographs: List of Classifications (data dated 23 July 2026) (accessed 2026-09-19)
- EFSA — Opinion of the Scientific Panel on food additives, flavourings, processing aids and materials in contact with food (AFC) on a request from the Commission related to tertiary-Butylhydroquinone (TBHQ) (accessed 2026-09-19)
This page summarizes what regulators and published research say, as of the review date above. Rules and evidence change; check the linked sources for the latest. It is general information, not medical advice — talk to a doctor or pharmacist about your own health.