What E321 actually is
BHT does the same job as BHA, stopping fats from oxidising and going rancid. It is used at very low levels in cereals, snacks, and fats, and it also appears in food packaging, where it migrates into the food in tiny amounts.
What it is made from
Synthesised from petrochemical feedstock, with no plant or animal input.
Vegan, vegetarian, and halal status
Fully synthetic, so it suits vegan, vegetarian, halal, and kosher diets.
Is E321 safe?
BHT is frequently lumped in with BHA in campaigning material, but their evidence pictures differ and the distinction matters. BHT carries no National Toxicology Program carcinogen listing. EFSA re-evaluated it in 2012 and actually raised the acceptable daily intake to 0.25 mg per kg of body weight per day, having concluded earlier concerns were not supported. Some rodent work has reported effects on liver enzymes and thyroid at high doses, which is reflected in the limit rather than in a restriction.
- No carcinogen listing, unlike BHA
- EFSA raised the acceptable daily intake to 0.25 mg per kg of body weight per day in its 2012 re-evaluation
- High-dose rodent studies reported liver enzyme and thyroid effects, reflected in the intake limit
- Can migrate into food from packaging in trace amounts
Where regulators stand
- EFSA (EU)
- Re-evaluated in 2012 with the acceptable daily intake raised to 0.25 mg per kg of body weight per day.
- FDA (US)
- Generally recognized as safe at limited levels.
Foods it turns up in
- Breakfast cereals
- Snack foods and crisps
- Fats, oils, and shortening
- Chewing gum
- Food packaging materials
Names it hides behind
- E321
- BHT
- Butylated hydroxytoluene
- Antioxidant (E321)
Common questions
- Is BHT bad for you?
- It carries no carcinogen listing, and EFSA raised rather than lowered its intake limit when it re-evaluated the evidence in 2012. It is often wrongly grouped with BHA, which does carry a listing.
- What is the difference between BHT and BHA?
- They do the same job and often appear together, but BHA is listed by the US National Toxicology Program as reasonably anticipated to be a human carcinogen and BHT is not.
- Is BHT vegan and halal?
- Yes. It is entirely synthetic with no animal-derived input.
- Why is BHT in cereal packaging?
- It protects the fat in the cereal from oxidising. Where it is in the packaging rather than the food, small amounts migrate in, which is a deliberate and regulated use.
- What are the natural alternatives?
- Rosemary extract (E392) and tocopherols (E306, vitamin E) do the same antioxidant job and are plant-derived.
Checking a real pack
This page answers the code. The pack in your hand is what decides, because the same code can come from different sources depending on the manufacturer. LabelWise, formerly SafeChoice, scans the label and explains what is in front of you.
LabelWise content is educational and describes how additives are made, regulated, and labelled. It is not medical, dietary, or religious advice. For certification questions, the mark on the pack and the certifying body are the authority.