Science
Mechanism of Action
This extract functions through a multi-pathway approach: it utilizes gallic and ellagic acids to neutralize oxidative stress, while hydrolyzable tannins (castalagin and vescalagin) provide natural astringency and anti-inflammatory action by inhibiting NF-kB signaling. Crucially, it stimulates the production of involucrin, a key protein in the cornified envelope, to strengthen the physical skin barrier.
Research
Clinical Evidence
Medium confidence5%
Key findings
- 01 Twice-daily application over 56 days resulted in a 31.76% improvement in skin firmness and a measurable decrease in wrinkle depth and volume.
Transparency
Dusting Analysis
Botanical extracts like Chestnut Shell are frequently included at concentrations below 0.1% for marketing purposes ('label dressing'). To achieve the 31% increase in firmness observed in clinical evaluations, the extract must be present at functional levels rather than trace amounts.
The Formula
Formulation
Stability
Highly sensitive to photo-oxidation and thermal degradation; formulations should be stored in opaque, airtight packaging. It is prone to darkening if exposed to air or iron salts.
Synergies
- Vitamin C
- Niacinamide
- Ceramides
Conflicts
- Iron salts
- Strong oxidizing agents
- High alkaline environments (pH > 7.0)
Safety
Safety Profile
Listed in the EU CosIng database and has passed human patch testing (20-22 subjects) with zero reported irritation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A high-performance upcycled ingredient that provides measurable improvements in skin density and barrier resilience when formulated at active concentrations.
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