Preservatives
BHA (butylated hydroxyanisole)
Definition
What it is
Preservative flagged as a possible carcinogen by IARC or multiple regulatory bodies. BHA is listed as a possible human carcinogen (Group 2B); BHT and TBHQ have related concerns.
On the label
How it appears on labels
- bha
- butylated hydroxyanisole
Regulation
Regulatory status
- European Union Banned
- Japan Banned
- United Kingdom Banned
- Australia/NZ Restricted
Explainer
In plain language
BHA, or butylated hydroxyanisole, is a synthetic antioxidant preservative. Its job is to keep fats and oils from going rancid, which extends the shelf life of foods that contain them. It is made industrially and is often used alongside its cousin BHT.
Assessment
Why it is flagged
The International Agency for Research on Cancer classified BHA as possibly carcinogenic to humans (Group 2B), a category that signals limited evidence rather than proof. The US National Toxicology Program lists it as reasonably anticipated to be a human carcinogen, based largely on animal studies where high doses were associated with tumors in the forestomach, an organ humans do not have. The FDA continues to permit BHA as generally recognized as safe within limits, and EFSA has set an acceptable daily intake after review. So the picture is genuinely mixed: strong animal signals at high doses, uncertain human relevance, and regulators that permit it while classification bodies flag it. Clear Label marks it high severity because of that classification gap.
In the aisle
Where it commonly shows up
- Chips, crackers, and snack foods
- Breakfast cereals
- Instant mashed potatoes and dehydrated foods
- Chewing gum
- Butter, lard, and shortening
- Some processed meats and preserved products
Practical
Reading the label
It appears as BHA or butylated hydroxyanisole, often in the phrase 'to preserve freshness' near the end of an ingredient list. It sometimes hides in the packaging or in an ingredient's own preservative rather than the finished food, so it is not always declared. In the EU it is E320.
Alternatives
If you want to avoid it
Some people choose products preserved with vitamin E (tocopherols) or rosemary extract instead, or fresher foods with shorter shelf lives that do not need strong antioxidants. Comparing two similar snack brands often reveals one that skips it.
FAQ
Common questions
Is BHA banned?
No major market has banned BHA as a food additive as of 2026. The FDA permits it within limits and EFSA has set an acceptable daily intake, even though IARC lists it as Group 2B, possibly carcinogenic.
What is the difference between BHA and BHT?
Both are synthetic antioxidant preservatives that protect fats, and they are often used together. BHA carries the IARC Group 2B classification, while BHT has related but somewhat different safety questions.
Why do the animal studies matter if humans differ?
Much of the cancer signal came from tumors in the forestomach of rodents, an organ people do not have, which is one reason regulators and classification bodies weigh the evidence differently. That unresolved relevance is exactly why the additive stays contested.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.