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Quick answer: Resorcinol carries the heavier risk profile. Cyclopentasiloxane is restricted in the EU and allowed in the US; Resorcinol is restricted in the EU and allowed in the US.
| Property | Cyclopentasiloxane | Resorcinol |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | medium | high |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | endocrine disruptor | endocrine disruptor |
| Where it hides | hair serum, primer, deodorant | permanent hair dye, acne treatment |
Cyclopentasiloxane is a volatile silicone (D5) used for smooth, silky texture.
Resorcinol is a phenol used in hair dyes and acne products.
Cyclopentasiloxane: Persistent and bioaccumulative; the EU restricts D5 in wash-off products over environmental and endocrine concerns. The US has no restriction.
Resorcinol: A thyroid endocrine disruptor and skin sensitizer; the EU restricts its concentration. Less tightly controlled in the US.
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