Get the app
Moderate Concern

Butylated hydroxyanisole

Antioxidant / Preservative

CarcinogenEndocrine Disruptor

Description

Butylated hydroxyanisole (BHA) is a synthetic antioxidant added to foods to prevent fats and oils from turning rancid. It appears in various processed foods – for example, some dry cereals, snack products, baked goods, and preserved meat items – including ingredients used in fast-food meals. BHA helps extend shelf life by guarding against spoilage, but high doses have caused cancer in laboratory animals. Consequently, BHA is considered “possibly carcinogenic to humans” by expert agencies. There are also concerns that it may affect hormone function (acting as an endocrine disruptor). Although BHA is allowed in the U.S. in small amounts, its safety is debated, and it has been flagged for caution.

Learn More Dossier

Aliases: BHA; tert-butylhydroxyanisole; E320 (EU additive code) Regulatory Status & Exposure: In the U.S., BHA is an approved food additive that is “generally recognized as safe” under specific conditions. FDA regulations cap the total added antioxidants (BHA plus similar preservatives) at 0.02% of a food’s fat and oil content. International experts (JECFA/WHO and EU Scientific Committee) established an acceptable daily intake (ADI) of 0.5 mg/kg body weight for BHA. In 2011, after reviewing new data, the European Food Safety Authority (EFSA) raised the ADI to 1.0 mg/kg/day, noting that current dietary exposures are generally below that level. BHA remains legal in both the U.S. and EU for use in foods (with concentration limits), except it is not permitted in certain baby foods. California’s Proposition 65 formally lists BHA as a carcinogen (requiring a warning label if exposures exceed 4,000 µg/day). The European Union also effectively restricts BHA in foods intended for infants and young children, and classifies it as a suspected endocrine-disrupting substance due to evidence of hormone-related effects. Technical Evidence: BHA is a mixture of two isomers that acts as an antioxidant, preventing oxidative rancidity in fats. In toxicology studies, high doses of BHA induced cancers in multiple animal species (notably causing fore stomach tumors in rodents). Some experts point out that these tumors occurred in the rodent forestomach – an organ humans do not have – suggesting the effect may be less relevant to human cancer risk. However, the fact that BHA caused tumors in at least three different species is a clear warning sign for potential human carcinogenicity. Mechanistic studies show that BHA can trigger oxidative stress and DNA damage in cells. BHA has also demonstrated endocrine-disrupting effects in lab studies: it can bind to hormone receptors and alter hormonal signaling, which in animals led to impacts on reproduction and development. Fast-Food Context: In fast-food and commercial food preparation, BHA is used to preserve fat-rich ingredients. Its high thermal stability means it remains effective even during frying and baking operations. Suppliers might add BHA to frying oils or shortenings to prevent oxidation during storage and repeated heating. For example, BHA is sometimes applied to dehydrated potato products (like dried hash brown or french fry mixes) and to certain seasoning packets to prolong their shelf life. By slowing the onset of rancidity, BHA helps keep oil-rich fast-food ingredients stable through distribution and high-temperature cooking. Sensitive Populations / Notes: Infants and young children may be more vulnerable to BHA’s effects, which is one reason it is barred from baby foods in the EU. Pregnancy and early development are critical periods as well; because BHA can disrupt endocrine function in animal studies, there is concern about prenatal exposure affecting fetal development. Individuals with high-fat diets or frequent fast-food consumption could have higher BHA intake and absorption – a high-fat meal is known to increase BHA uptake in the body. Even so, typical dietary use of BHA is low. For perspective, heavy consumption would still be unlikely to exceed California’s “no significant risk” intake level for cancer (4 mg per day).

Regulatory status

Australia
Allowed Australia/New Zealand Food Standards Code Schedule 15 (food additives list). Basis: Schedule 15 (food additives list) Source
Canada
Allowed Permitted-additives framework (verification of BHA line item pending). Basis: Other Source
International
Allowed international food standards GSFA category permissions/maximum levels for INS 320. Basis: international food standards STAN 192-1995 (GSFA) via GSFA Online Source
European Union
Allowed Annex II category permissions/limits (often as part of antioxidant groupings). Basis: Regulation (EC) No 1333/2008, Annex II (Union list; consolidated text) Source
Japan
Allowed Designated additive listing (Japan). Basis: Other Source
United States
Allowed Food use + food-contact uses under CFR; reassessment announced 2026-02-10. Basis: 21 CFR 172.110 (and related provisions for GRAS/food-contact summarized by NTP RoC profile) Source

Registry review date: 2026-02-24

State policy updates

California (US)
Restricted Proposition 65 cancer listing may trigger exposure warning requirements unless safe harbor thresholds apply. Effective: 1990-01-01 Source
US-WV
Banned Food, drink, confectionery, or condiment sold in WV treated as adulterated if containing BHA (effective 2028-01-01). Effective: 2028-01-01 Compliance: 2028-01-01 Source

Policy timeline

  • 2026-02-10 — FDA announced reassessment / request for information on BHA (United States)
  • 2025-03-14 — WV HB 2354 enacted (adulterated-food amendments include BHA; future effective date for those amendments) (US-WV)
  • 2025-12-23 — Preliminary injunction enjoining WVDOH enforcement of HB 2354 provisions enforced by WVDOH (US-WV)

Research Evidence Snapshot

Animal carcinogenicity findings exist (forestomach tumors) and drive hazard listing; regulatory risk assessments may discount forestomach-specific effects for humans and set ADIs. Non-cancer toxicity endpoints include liver and kidney findings in animals and some offspring adverse outcomes.
Critical endpoints: Cancer hazard (animal), liver and kidney toxicity (animal), developmental/offspring adverse outcomes (animal), limited/inadequate human epidemiology.
ACUTE SENSITIVITY HAZARD
Confidence: Medium
Low
Primary authoritative profiles emphasize chronic endpoints (carcinogenicity/systemic toxicity) rather than acute sensitivity; acute sensitivity is not a prominent concern in the RoC profile.
CHRONIC HEALTH EVIDENCE DIRECTION
Confidence: Medium
Mixed/heterogeneous
NTP lists BHA as reasonably anticipated human carcinogen based on animal data; FSCJ derives an ADI and considers rodent forestomach effects not relevant to humans; human epidemiology largely inadequate.
EVIDENCE STRENGTH
Confidence: Medium
Moderate
Multiple animal carcinogenicity findings are described, but human evidence is limited/inadequate; overall evidence is stronger than mechanistic-only but not strong human evidence.
REGULATORY POSTURE (U.S.)
Confidence: High
Under active re-review
FDA announced reassessment/request for information in Feb 2026 while existing permissions remain in place.
REGULATORY DIVERGENCE
Confidence: Medium
Moderate
Many jurisdictions authorize BHA with limits (EU, international food standards, AU/NZ, Japan), but WV enacted a future-dated restriction (effective 2028) that is under litigation.
HEALTH-BASED GUIDANCE AVAILABILITY
Confidence: High
Established
FSCJ specifies an ADI for BHA (0.5 mg/kg bw/day) from a dog NOAEL with safety factor.
EXPOSURE CERTAINTY
Confidence: High
Low
Restaurant/fast-food use levels are difficult to quantify; available intake/measurement information in RoC profile is historical and not fast-food specific.
DATA RECENCY & STABILITY
Confidence: Medium
Evolving
FDA reassessment (2026) and state litigation/policy shifts indicate changing regulatory landscape; exposure data frequently relies on older studies.

Health guidance & exposure

  • ADI — Food Safety Commission of Japan (FSCJ) (2018): 0.5 mg/kg bw/day

Agency exposure estimates

  • NTP RoC profile (summarized literature) — Estimated average daily intake (historic, 1975 estimate): 4.3 mg/day

Measured food levels

  • NTP RoC profile (summarized literature) — Human adipose tissue concentrations reported historically (0.01–0.03 ppm range; small samples; legacy data): Not specified

Fast-food and restaurant supply chains often do not disclose antioxidant systems used in frying oils/shortenings, coatings, and premixes; exposure estimates are therefore uncertain.

Data gaps

  • Modern U.S. dietary exposure estimates for BHA (post-2010) in the general population and in children.
  • Measured concentrations of BHA in restaurant frying oils, fast-food items, and upstream ingredients supplied to restaurants.
  • Clear Canada-specific maximum levels for BHA extracted directly from the Health Canada permitted-additives lists (this run did not capture the BHA row).

Found in these Restaurants

We found this ingredient in menu items at the following chains:

Panera Bread
1 items ›
Arby's
1 items ›

Methodology

We assign the Moderate Concern tier using published research, regulatory guidance, and PRūF’s additive taxonomy. Restaurant usage is derived from public ingredient disclosures and mapped to menu items where this additive appears.

Browse all restaurant audits

Related questions and pages

Browse all ingredient evidence pages Browse all restaurant audits Regulatory framework overview

Regulatory context

Learn how this additive is treated across different regulatory frameworks and why mixture effects can matter.

Regulatory frameworks overview Read analysis →

Scientific Sources & References

About this Audit

Data sourced from publicly available nutrition guides and ingredient lists as of 2026-03-04. Percentages represent the frequency of an ingredient's appearance across standard menu items, not the quantity within a specific item. Regional availability and supplier formulations may vary.

PRūF is an independent educational tool and is not affiliated with, endorsed by, or connected to any restaurant chain mentioned. All trademarks belong to their respective owners.

Scan your food for additives of concern

Want to check ingredients like Butylated hydroxyanisole? Download PRūF to check any menu item instantly.

Download on the App Store