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Polysilicone-15

Polysilicone-15SPF filter

A UVB filter built on a silicone chain — a supporting filter in EU sunscreens, not a US sunscreen active.

What it does

Polysilicone-15 absorbs UVB light, peaking around 310 nm. It does not cover UVA. On its own it adds only a little protection: at its maximum EU strength (10%) it gave an SPF under 4 in testing. So it works as a supporting filter beside others, not as the main one. The EU permits it up to 10%, and its safety assessment measured about 2% absorbed through skin. It is not on the US FDA's list of sunscreen actives.

The evidence, graded

moderatePolysilicone-15 absorbs UVB light, peaking near 310 nm. The EU permits it in sunscreens up to 10%, and it is not on the US list of sunscreen actives. On its own it contributes little SPF, so it works as a supporting filter.EU 2009 · Official Journal of the European Union ↗

Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.

Also known as

parsol slx, dimethicodiethylbenzalmalonate, benzylidene malonate polysiloxane

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