What is the difference between BHA and BHT?

They are close chemical cousins that do the same job — stopping fats and oils going rancid — and are often used together. The key difference is their cancer classification: IARC rates BHA as Group 2B (possibly carcinogenic), while BHT is Group 3 (not classifiable — the evidence was too limited). LabelCop treats BHA as higher risk for that reason.

Why is the FDA reviewing BHA and BHT in 2026?

Both were classified as Generally Recognized as Safe (GRAS) decades ago. In 2026 the FDA opened post-market safety reassessments of both under its new food-chemical review programme — issuing a request for information on BHA in February 2026 and on BHT, with scientific data on BHT due by 13 July 2026. Being reviewed does not mean they have been restricted; it means the FDA is re-examining old decisions with newer data.

Which foods contain BHA and BHT?

They protect fats from going rancid, so they turn up in crisps and savoury snacks, instant noodles and their seasoning, breakfast cereals, chewing gum, biscuits and baked goods, fried and instant foods, butter, lard and vegetable oils, and dehydrated potato products. On labels look for BHA, BHT, E320, E321, INS 320, INS 321, or the full names butylated hydroxyanisole and butylated hydroxytoluene.

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Are BHA and BHT safe?

Q: Are BHA and BHT banned in India?

No. FSSAI permits both BHA (INS 320) and BHT (INS 321) as antioxidants in specified foods within prescribed limits, usually as a combined maximum for synthetic antioxidants. Neither is banned in India, the US, the UK, the EU, Australia or Canada — all permit them at limited levels.

Q: Is BHA a carcinogen?

The World Health Organization's cancer agency (IARC) classified BHA in 1986 as 'possibly carcinogenic to humans' (Group 2B), based on forestomach tumours in rodents fed high doses. The US National Toxicology Program lists it as 'reasonably anticipated to be a human carcinogen'. Regulators still permit BHA because they judge the tumour mechanism seen in rodents may not apply to humans, and because dietary exposure is low — but LabelCop flags it on the strength of those classifications.

By LabelCop · Last updated 18 July 2026 · Sources: EFSA, FDA, FSSAI, WHO/JECFA, IARC, NTP

The short answer: two chemical cousins, treated differently by every regulator — and that split is the story.

BHA (E320): rated "possibly carcinogenic" by the WHO's cancer agency — permitted everywhere, but flagged
BHT (E321): the same cancer agency found the evidence too limited to classify — lower risk, but still synthetic
US (2026): the FDA reopened safety reviews of both — decades after clearing them
LabelCop: flags BHA as high-risk, BHT as medium-risk — the strictest read wins

What are BHA and BHT?

Two synthetic antioxidants with one job: stopping fats and oils going rancid, so packaged food keeps its smell, taste and colour for longer
They are close chemical relatives and are often used together in the same product
BHA = butylated hydroxyanisole; BHT = butylated hydroxytoluene
Label names: BHA, E320, INS 320 and BHT, E321, INS 321

Which foods contain them?

Crisps, savoury snacks and instant noodles (and their seasoning sachets)
Breakfast cereals, biscuits, baked goods and chewing gum
Butter, lard, vegetable oils and shortening
Fried, instant and dehydrated foods — including dried potato products

In India: most common in fried snacks, instant noodles, biscuits and edible oils — look for INS 320 or INS 321, often listed together

What the regulators actually say

Regulator	Status	Reasoning
EFSA / European Union	Both permitted	EFSA re-evaluated BHA in 2011 and BHT in 2012, concluding neither raises a genotoxicity (DNA-damage) concern and setting acceptable daily intakes — for BHT, 0.25 mg per kg of body weight per day. Both remain authorised antioxidants at limited levels.
FDA (United States)	Permitted, both under review	Both are Generally Recognized as Safe (GRAS) — BHA since 1958, BHT as an antioxidant capped at 0.02% of a food's fat or oil content. In 2026 the FDA opened post-market reassessments of both: a request for information on BHA (February 2026) and on BHT, with scientific data due 13 July 2026.
FSSAI (India)	Both permitted in specified foods	Permitted as antioxidants (INS 320, INS 321) under Schedule I of the food-additive regulations, typically as a combined synthetic-antioxidant maximum for each food category.
WHO / JECFA	ADIs set	The joint FAO/WHO expert committee set acceptable daily intakes of up to 0.5 mg/kg body weight for BHA and up to 0.3 mg/kg for BHT — levels it judges safe for lifetime daily consumption.
WHO / IARC (cancer agency)	BHA "possibly carcinogenic"; BHT unclassified	IARC rates BHA as Group 2B — possibly carcinogenic to humans — based on forestomach tumours in rodents. BHT is Group 3 — not classifiable, because the animal evidence was too limited. The US National Toxicology Program also lists BHA as "reasonably anticipated to be a human carcinogen".

Why do regulators disagree?

The BHA cancer question comes from rodents. High doses caused tumours in the rodent forestomach — an organ humans don't have
The split: IARC records the animal finding as a possible signal (Group 2B); food regulators judge the mechanism may not carry over to people and keep BHA permitted at low levels
BHT got a milder verdict — the same evidence was thinner, so IARC left it unclassified (Group 3) and EFSA set a normal ADI
The 2026 twist: the FDA reopening both reviews signals that "cleared decades ago" is no longer treated as the final word — newer data is being weighed
These are honest readings of the same evidence, not a scandal — but a cancer classification on one of a pair, plus a live FDA review, is exactly the kind of disagreement we surface instead of hiding

How LabelCop scores them

BHA (E320) is a high-risk flag — on the strength of the IARC Group 2B rating and the NTP "reasonably anticipated" carcinogen listing
BHT (E321) is a medium-risk flag — lower, because IARC left it unclassified, but still a synthetic antioxidant with animal-study concerns
Rule: strictest read wins — a credible cancer classification is enough for us to flag BHA everywhere, even where it's legal
You see the flag, the reason and the sources on every scan. No black box

Frequently asked questions

Are BHA and BHT banned in India?

No. FSSAI permits both (INS 320 and INS 321) as antioxidants in specified foods within prescribed limits, usually as a combined maximum. Neither is banned in India, the US, the UK, the EU, Australia or Canada.

Is BHA a carcinogen?

The WHO's cancer agency (IARC) rates it Group 2B — "possibly carcinogenic to humans" — based on rodent forestomach tumours, and the US National Toxicology Program lists it as "reasonably anticipated to be a human carcinogen". Regulators still permit it because they judge the rodent mechanism may not apply to people and dietary exposure is low. LabelCop flags it on the strength of those classifications.

What's the difference between BHA and BHT?

They're chemical cousins doing the same job and are often used together. The key difference is the cancer verdict: BHA is IARC Group 2B (possibly carcinogenic); BHT is Group 3 (not classifiable — evidence too limited). That's why we treat BHA as higher risk.

Why is the FDA reviewing them in 2026?

Both were cleared as GRAS decades ago. In 2026 the FDA reopened post-market safety reassessments of both — a request for information on BHA in February, and on BHT with data due 13 July 2026. Being reviewed doesn't mean restricted; it means old decisions are being re-examined with newer data.

How do I avoid them?

Read the ingredients list for BHA, BHT, E320, E321, INS 320 or INS 321 — most common in fried snacks, instant noodles, cereals and edible oils. Or scan the label with LabelCop and they're flagged automatically, with the regulator reasoning shown.

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Sources

EFSA (2011): re-evaluation of BHA (E320) as a food additive · EFSA (2012): re-evaluation of BHT (E321) as a food additive · FDA (2026): assessment of BHA launched · FDA (2026): reassessment of BHT launched · US NTP Report on Carcinogens: BHA · WHO/IARC Monographs: classification list (BHA Group 2B, BHT Group 3) · FSSAI: Food Safety and Standards regulations — permitted antioxidants

Related ingredients: TBHQ (E319) · Sodium benzoate (E211) · Titanium dioxide (E171)

This article explains regulatory status and published scientific assessments in plain English. It is not medical advice.