What it is
This is a synthetic oil-soluble compound that acts as an antioxidant and is used to help stabilize formulations against light-induced degradation. In sunscreens it is sometimes added to support the photostability of organic UV filters and to limit oxidation in the oil phase. It is a supporting ingredient rather than a UV filter itself.
Safety & warnings
This antioxidant is generally well tolerated at the low levels used in cosmetics and is not a recognized fragrance allergen.
Origin & sourcing
Synthetic. It is a defined benzylmalonate diester.
Questions everyone asks
What is the main role of this ingredient?
It acts as an oil-soluble antioxidant and can help stabilize formulations and UV filters against light-induced degradation.
Is it itself a sunscreen filter?
No. It is a supporting antioxidant and photostabilizer, not an approved UV filter.