What it is
Castanea Crenata Shell Extract is derived from the outer shell of the chestnut Castanea crenata, a by-product of chestnut processing. The shell is rich in polyphenols, and in cosmetics the extract is used primarily for antioxidant and skin-conditioning purposes. It is a botanical commonly seen in East Asian skincare that emphasizes upcycled or plant-derived actives.
Safety & warnings
As a polyphenol-rich botanical extract it is generally well tolerated; as with any plant extract, sensitivity is possible in predisposed individuals.
Origin & sourcing
Natural botanical extract obtained from the shells of Castanea crenata, the chestnut species native to Japan and Korea, often as an upcycled processing by-product.
Questions everyone asks
What part of the chestnut is used?
The extract comes from the outer shell of Castanea crenata, often upcycled from chestnut processing.
What is its main cosmetic role?
It is used chiefly as an antioxidant and skin-conditioning ingredient, owing to its polyphenol content.