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