What it is
Silybum Marianum Ethyl Ester is derived from milk thistle (Silybum marianum), a plant known for its antioxidant flavonolignan content. The ethyl ester form is processed to improve compatibility with cosmetic oil phases, and it is used as a conditioning and antioxidant-supporting ingredient. In sunscreens it acts as a supporting botanical-derived material rather than as a UV filter.
Safety & warnings
Generally well tolerated at cosmetic use levels. As a botanical-derived material, individuals with plant sensitivities may wish to patch test, though milk thistle derivatives are not noted as common irritants.
Origin & sourcing
Plant-derived; an ethyl ester prepared from milk thistle constituents to improve cosmetic processability.
Questions everyone asks
What plant is this ingredient from?
It is derived from milk thistle (Silybum marianum), a plant valued for its antioxidant flavonolignan compounds.
Why is it made as an ethyl ester?
The ester form improves its compatibility with the oil phase of cosmetic formulas, making it easier to incorporate.