Butylated Hydroxyanisole vs Cyclopentasiloxane: which is worse?
Quick answer: Butylated Hydroxyanisole carries the heavier risk profile. Butylated Hydroxyanisole is — in the EU and — in the US; Cyclopentasiloxane is restricted in the EU and allowed in the US.
| Property | Butylated Hydroxyanisole | Cyclopentasiloxane |
|---|---|---|
| EU status | — | Restricted |
| US status | — | Allowed |
| Risk level | — | medium |
| Banned in | Japan (banned for foods containing fats and oils) | — |
| Restricted in | European Union (restricted; banned in baby food), United Kingdom | European Union |
| Category | additive | endocrine disruptor |
| Where it hides | — | hair serum, primer, deodorant |
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.
What is Cyclopentasiloxane?
Cyclopentasiloxane is a volatile silicone (D5) used for smooth, silky texture.
Documented risks
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.
Cyclopentasiloxane: Persistent and bioaccumulative; the EU restricts D5 in wash-off products over environmental and endocrine concerns. The US has no restriction.
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