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CARYA ILLINOINENSIS SHELL EXTRACT.

Valuable / SKIN CONDITIONING

Derived from upcycled pecan nut shells, this botanical powerhouse is a dense source of condensed tannins and phenolic acids. It functions as a robust environmental shield, neutralizing oxidative stress while providing significant calming benefits for reactive skin types.

Antioxidant Skin Conditioning Anti-inflammatory Antimicrobial

Science

The extract operates through a multi-pathway approach: it utilizes high concentrations of proanthocyanidins and ellagic acid to scavenge free radicals, inhibits TRPA1 receptors to reduce neurogenic inflammation, and maintains a healthy skin microbiome by disrupting the membranes of opportunistic pathogens.


Research

High confidence
Effective range 0.5–3%
Optimal

3%

Key findings

  1. 01 Inclusion at 3% concentration achieved an 80% reduction in DPPH radicals, confirming exceptional antioxidant potency.
  2. 02 Demonstrated broad-spectrum antimicrobial activity against Gram-positive/negative bacteria and yeast at concentrations as low as 0.78 mg/mL.
  3. 03 Significant inhibition of inflammatory markers and hydrogen peroxide production observed in bio-assays.

Transparency

Commonly dusted
Min. effective
1%
Red flag below
0.1%

Because it is a botanical byproduct, it is often included at negligible levels (below 0.1%) just for label claims. To reach the 80% antioxidant threshold seen in studies, a concentration closer to 3% is required.


The Formula

Solubility
Both
Optimal pH 3 – 6.5
0 7 14

Stability

Highly thermally stable up to 240°C, but chemically sensitive to light and oxygen. Formulations should be stored in opaque or UV-protected packaging.

Synergies

  • Vitamin C (Ellagic acid stabilizes L-Ascorbic Acid)
  • Hyaluronic Acid
  • Niacinamide

Conflicts

  • Proteins (tannins may precipitate collagen or gelatin)
  • Strong oxidizers
  • High alkaline environments (pH > 7.0)

Safety

CIR Status
Not reviewed
Pregnancy
Safe
Sensitization risk Low

Recognized as a safe food-industry byproduct; low risk of irritation or sensitization in general populations.


Your Skin

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

Our Assessment

Valuable

An excellent upcycled antioxidant that provides potent protection against environmental stressors when formulated at effective concentrations.


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