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CASTANEA SATIVA LEAF EXTRACT.

Valuable CAS 84695-99-8 / SKIN CONDITIONING, SOOTHING

A nutrient-dense botanical extract derived from Sweet Chestnut leaves, valued for its high concentration of polyphenols and its ability to defend the skin against environmental degradation. This ingredient serves as a multi-functional bioactive that bridges the gap between microbiome support and advanced photo-protection.

Antioxidant Skin conditioning Soothing agent DNA protection Microbiome regulator

Science

Operates through a complex network of phenolic compounds, including rutin and ellagic acid, which neutralize reactive oxygen species and inhibit matrix metalloproteinases (MMPs) to prevent collagen breakdown. It further stabilizes the skin barrier by modulating epidermal protein synthesis and employs 'quorum quenching' to prevent Staphylococcus aureus virulence without harming beneficial microflora.


Research

High confidence
Effective range 0.01–1%
Optimal

0.025%

Key findings

  1. 01 Demonstrated a 66.4% reduction in UV-induced DNA damage in human keratinocytes at a concentration of 0.1 µg/mL.
  2. 02 In vivo testing at 0.025% confirmed significant skin hydration maintenance for over 4 hours post-application.
  3. 03 Clinical evaluation of a 2.0% blend (providing 0.01-0.03% active extract) showed high efficacy in soothing inflammation and reinforcing barrier function.

Transparency

Not commonly dusted
Min. effective
0.01%
Red flag below
0.005%

Because this extract shows measurable biological activity at extremely low thresholds (0.01% for barrier support), it is difficult to classify as 'dusted' unless used in trace amounts purely for label claims. However, clinical benefits for anti-aging and DNA protection are maximized near the 0.1% to 1.0% range.


The Formula

Solubility
Water
Optimal pH 4.5 – 5.5
0 7 14

Stability

Highly pH-dependent; antioxidant capacity significantly diminishes at a neutral pH of 7.1. Stability is best maintained in glyceric carriers and must be protected from temperatures exceeding 40°C.

Synergies

  • Glycerin
  • UV filters
  • Barrier-repairing lipids

Conflicts

  • Alkaline formulations (pH > 7.0)
  • High-heat manufacturing processes

Safety

CIR Status
2024 Final Priority List for review
Max tested
1%
Pregnancy
Safe
Sensitization risk Low

Standard cosmetic usage between 0.1% and 1.0% is categorized as safe based on clinical patch testing.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

An exceptional bioactive for sensitive and photo-damaged skin, providing significant protection against DNA damage and barrier disruption at remarkably low concentrations.


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