Castanea Sativa Shell Extract
INCI: CASTANEA SATIVA SHELL EXTRACT
Reviewed by Emma · Last updated 14 Aug 2026
Plant extract with skin-conditioning properties derived from sweet chestnut shells
Best For Skin Types
All, Dry, Sensitive, Mature
Addresses
Usage Frequency
Daily
What Is Castanea Sativa Shell Extract?
Castanea sativa shell extract is derived from the outer shell of the sweet chestnut tree, native to southern Europe. The extract is obtained through processing these shells to isolate beneficial compounds, primarily used in skincare formulations for their skin-conditioning properties.
In cosmetic products, this ingredient functions as a skin conditioner, helping to maintain skin texture and suppleness. It contains tannins and polyphenols—plant compounds known to have antioxidant properties—though the concentration and bioavailability of these actives in finished skincare products can vary considerably.
How It Works
Castanea sativa shell extract works primarily through its tannin and polyphenol content. These compounds have been traditionally valued in botanical skincare for their astringent and antioxidant properties, though in cosmetic formulations their activity is largely dependent on extraction method and concentration.
The extract conditions the skin by forming a protective layer on the skin's surface, helping to retain moisture and improve tactile smoothness. The antioxidant compounds may also help neutralise free radicals generated by environmental exposure, though the clinical significance of this benefit in a skincare formula requires further substantiation.
Clinical Evidence & References
Research specifically focused on Castanea sativa shell extract in skincare is limited. Most supporting evidence comes from traditional use and in vitro studies of the plant's polyphenolic compounds, rather than robust clinical trials on finished formulations.
What we do know is that plant tannins and polyphenols have demonstrated antioxidant activity in laboratory settings, and the ingredient is well-established in cosmetic use as a conditioning agent. However, the practical benefit of this ingredient in a skincare product will depend on the concentration used, the extraction method, and whether it has been stabilised appropriately for shelf stability.
How to Use
Castanea sativa shell extract is typically used as a supporting ingredient within a broader formulation rather than as a standalone active. It integrates well into serums, creams, and toners. No special application technique is required; simply use the product as directed. Since it is a conditioning ingredient, it works best as part of a consistent skincare routine.
Safety & Precautions
Frequently Asked Questions
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Take the skin quizOther forms of Castanea Sativa Shell Extract
These appear on ingredients lists under different names but are the same substance. Castanea Sativa Shell Extract is the common form.
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