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Butylated Hydroxyanisole (BHA)

Also known as: BHA, Butylated hydroxyanisole

An antioxidant used to protect formulas from oxidation; not the beta hydroxy acid meant in exfoliating skincare.

Amber bottle and wax flakes on folded brown paper
Editorial illustration

Butylated hydroxyanisole is an antioxidant used to slow oxidation in some formulas. It is not salicylic acid or an exfoliating beta hydroxy acid. NTP lists it as reasonably anticipated to be a human carcinogen based on animal evidence; that hazard finding is important, but does not quantify an individual's risk from a specific cosmetic exposure.1, 2

  • Antioxidant BHA and salicylic-acid BHA are different substances.1
  • Its documented formulation role includes slowing oxidation.1
  • NTP's carcinogen classification is based on experimental animal evidence.2

What is Butylated Hydroxyanisole (BHA)?

The same three-letter acronym can describe unrelated ingredients. On a formula label, butylated hydroxyanisole refers to a phenolic antioxidant; in an exfoliant's marketing, BHA usually means beta hydroxy acid. The functions, evidence and risk questions should not be swapped between the two.1

Where it comes from

Natural sources

  • Not a botanical extract or an essential nutrient.

How it's made

Manufactured antioxidant; cosmetic purity and concentration are relevant to exposure.

What it does in products

  • Antioxidant protection of formulation ingredients

Benefits

Oxidation control in products

limited evidence

BHA can help protect susceptible formula ingredients from oxidative deterioration. This does not establish a health benefit from consuming or applying extra BHA.1

The historic CIR assessment concerns cosmetic function and safety. It is not evidence that antioxidant BHA exfoliates skin or prevents a disease.

Evidence scope and limitations

Butylated hydroxyanisole as a cosmetic antioxidant, with NTP animal-based carcinogenic hazard context; not beta hydroxy acid exfoliation.

  • The original cosmetic assessment is old and should not be described as current comprehensive clearance.
  • No quantitative personal topical-risk estimate is made.
  • Food and cosmetic exposure cannot be conflated.

Evidence last checked: 2026-10-01

Side effects & safety

Irritation or sensitivity (varies)The old cosmetic assessment does not rule out an individual reaction or answer every modern exposure scenario.

Safety considerations

  • Food ingestion, concentrated laboratory material and low-level topical exposure are different contexts; their findings should not be treated as identical.
  • Not for: Avoid after a known reaction to BHA-containing products.
  • Not for: Do not infer that a historical cosmetic review cancels NTP's hazard finding.
2, 1

Amounts studied & product use

These figures describe research or common product use, not a personal dose or treatment recommendation.

In skincare studies and products

The cited 1984 cosmetic review evaluated reported use practices. It is not a current universal concentration recommendation; this guide does not calculate personal cancer risk or supply a DIY level.

1

Regulatory status

  • Cosmetic antioxidant use remains subject to U.S. cosmetic safety requirements. An NTP hazard classification and a cosmetic ingredient safety assessment answer different questions.
  • INCI name on cosmetic labels: BHA.
  • The cited original CIR assessment is historical (1984), not a new 2026 safety clearance.
3, 2

Hazard, exposure and uncertainty

A carcinogenic hazard indicates that an agent can cause cancer under studied conditions. Risk additionally depends on exposure, route and dose. The NTP report's animal feeding findings cannot be converted into a precise probability for a person's moisturizer.

That distinction is not a reason to dismiss the finding. It is a reason to avoid both an unsupported harmlessness guarantee and an unsupported claim that any cosmetic containing BHA causes cancer.

2, 1

Frequently asked questions

Will this BHA unclog pores?

The antioxidant butylated hydroxyanisole is not the beta hydroxy acid used for exfoliation. Look for salicylic acid when interpreting that separate claim.1

Does the NTP listing prove my cream causes cancer?

It identifies an animal-evidence-based hazard. It does not provide a risk estimate for your product, and the route and amount of exposure still matter.2

The bottom line

First resolve which BHA is meant. Then keep the real hazard finding separate from claims about an unmeasured personal cosmetic risk.

References

  1. Final Report on the Safety Assessment of Butylated Hydroxyanisole. Journal of the American College of Toxicology / CIR (1984) · safety assessment · DOI 10.3109/10915818409021273
  2. Butylated Hydroxyanisole: Report on Carcinogens, Fifteenth Edition. National Toxicology Program (2021) · government guidance · CAS 25013-16-5
  3. FDA Authority Over Cosmetics: How Cosmetics Are Not FDA-Approved, but Are FDA-Regulated. U.S. Food and Drug Administration (2013) · government guidance · Page updated August 3, 2013; accessed October 1, 2026

Revision history

  1. Initial AI-assisted evidence compilation with source-linked claims, formulation distinctions and explicit research limitations; not independent medical review.