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Quick answer: Nonylphenol carries the heavier risk profile. Cyclopentasiloxane is restricted in the EU and allowed in the US; Nonylphenol is banned in the EU and allowed in the US.
| Property | Cyclopentasiloxane | Nonylphenol |
|---|---|---|
| EU status | Restricted | Banned |
| US status | Allowed | Allowed |
| Risk level | medium | high |
| Banned in | — | European Union |
| Restricted in | European Union | — |
| Category | endocrine disruptor | endocrine disruptor |
| Where it hides | hair serum, primer, deodorant | older cleansers, surfactant blends |
Cyclopentasiloxane is a volatile silicone (D5) used for smooth, silky texture.
Nonylphenol (Nonylphenol) is a surfactant breakdown product.
Cyclopentasiloxane: Persistent and bioaccumulative; the EU restricts D5 in wash-off products over environmental and endocrine concerns. The US has no restriction.
Nonylphenol: A persistent estrogenic endocrine disruptor; banned in EU cosmetics.
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