Formaldehyde (free) vs Butylated Hydroxyanisole: which is worse?
Quick answer: Formaldehyde (free) carries the heavier risk profile. Formaldehyde (free) is banned in the EU and allowed in the US; Butylated Hydroxyanisole is — in the EU and — in the US.
| Property | Formaldehyde (free) | Butylated Hydroxyanisole |
|---|---|---|
| EU status | Banned | — |
| US status | Allowed | — |
| Risk level | high | — |
| Banned in | European Union | Japan (banned for foods containing fats and oils) |
| Restricted in | — | European Union (restricted; banned in baby food), United Kingdom |
| Category | cmr | additive |
| Where it hides | nail hardener, keratin treatment, eyelash glue | — |
What is Formaldehyde (free)?
Formaldehyde (free) is free formaldehyde used directly as a preservative and in salon hair treatments.
What is Butylated Hydroxyanisole?
Butylated hydroxyanisole (BHA) is a synthetic phenolic antioxidant preservative derived from petroleum (see also bha entry). It is a mixture of 2-BHA and 3-BHA isomers, used to prevent oxidative rancidity in fats, oils, and fat-containing foods. Chemical formula C11H16O2.
Documented risks
Formaldehyde (free): A known human carcinogen (IARC Group 1). Banned from direct use in EU cosmetics; allowed in US products with limited oversight.
Butylated Hydroxyanisole: IARC classifies BHA as Group 2B (possible human carcinogen) based on forestomach tumor studies in rodents at high doses. The NTP lists it as 'reasonably anticipated to be a human carcinogen.' EFSA's 2012 review found endocrine-disrupting potential. Japan banned it for food use. The FDA permits it at 0.02% of fat content. Concerns about estrogen-receptor interaction have been documented in animal studies. Contact dermatitis from cosmetic use is reported.
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