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Quick answer: Dodecamethylcyclohexasiloxane carries the heavier risk profile. Cyclopentasiloxane is restricted in the EU and allowed in the US; Dodecamethylcyclohexasiloxane is restricted in the EU and allowed in the US.
| Property | Cyclopentasiloxane | Dodecamethylcyclohexasiloxane |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | medium | low |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | endocrine disruptor | endocrine disruptor |
| Where it hides | hair serum, primer, deodorant | hair serum, primer |
Cyclopentasiloxane is a volatile silicone (D5) used for smooth, silky texture.
Dodecamethylcyclohexasiloxane (Cyclohexasiloxane) is a volatile silicone (D6).
Cyclopentasiloxane: Persistent and bioaccumulative; the EU restricts D5 in wash-off products over environmental and endocrine concerns. The US has no restriction.
Dodecamethylcyclohexasiloxane: Restricted in the EU over persistence and bioaccumulation.
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