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Quick answer: Both score equally on our risk model. Cyclopentasiloxane is restricted in the EU and allowed in the US; Kojic acid is restricted in the EU and allowed in the US.
| Property | Cyclopentasiloxane | Kojic acid |
|---|---|---|
| EU status | Restricted | Restricted |
| US status | Allowed | Allowed |
| Risk level | medium | medium |
| Banned in | — | — |
| Restricted in | European Union | European Union |
| Category | endocrine disruptor | endocrine disruptor |
| Where it hides | hair serum, primer, deodorant | skin-brightening serum, dark-spot cream |
Cyclopentasiloxane is a volatile silicone (D5) used for smooth, silky texture.
Kojic acid is a fungal-derived skin-lightening agent.
Cyclopentasiloxane: Persistent and bioaccumulative; the EU restricts D5 in wash-off products over environmental and endocrine concerns. The US has no restriction.
Kojic acid: A sensitizer flagged for possible thyroid effects; the EU caps it at 1% in face/hand products. US use is unrestricted.
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