What it is
Aesculus hippocastanum seed extract is derived from the seeds of the horse chestnut tree and characteristically contains the saponin escin along with flavonoids and tannins. In cosmetics it is used as a conditioning and astringent botanical and is often included for its toning, soothing-feel positioning. It is typically formulated at low levels in serums, eye products, creams, and sunscreens.
Safety & warnings
At cosmetic use levels horse chestnut seed extract is generally well tolerated. Because it contains saponins and tannins, very sensitive skin may occasionally find it mildly astringent, and as with any botanical, sensitization is possible in predisposed individuals.
Origin & sourcing
Natural extract obtained from the seeds of the horse chestnut tree (Aesculus hippocastanum).
Questions everyone asks
What is horse chestnut seed extract used for?
It is used as a conditioning, astringent botanical, often included for a toning feel and associated with the saponin escin.
Is it the same as edible chestnut?
No, horse chestnut is a different tree from the edible sweet chestnut, and its seeds are used only as an extract in cosmetics.