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COCOYL HYDROLYZED SILK.

Valuable / CLEANSING, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING

Cocoyl Hydrolyzed Silk is a functional derivative of silk protein, recognized for its exceptional ability to hydrate, protect, and condition the skin. It efficiently attracts and retains atmospheric moisture while forming a breathable barrier, promoting skin elasticity and reducing the appearance of fine lines.

Summary

Humectant Skin Conditioning Protective Barrier Collagen/Elastin Support Antioxidant Penetration Enhancer Emulsifying Surfactant/Cleansing Hair Conditioning

Science

Mechanism of Action

This ingredient acts primarily as a humectant, efficiently drawing and binding moisture to deeply hydrate the stratum corneum, thereby improving skin suppleness. It simultaneously establishes a protective, breathable film on the skin's surface, mitigating transepidermal water loss and shielding against environmental aggressors. Its rich amino acid profile supports endogenous collagen and elastin synthesis, contributing to enhanced skin firmness and elasticity. Furthermore, it exhibits antioxidant properties, neutralizing free radicals, and can optimize the dermal penetration of co-formulated active ingredients. Its surfactant capabilities also contribute to product formulation stability and texture.

Research

Clinical Evidence

Medium confidence
Effective range 1–5%
Optimal

N/A

Key findings

  1. 01 Demonstrated to be non-irritant in human skin irritation tests (aqueous hydrolyzed silk).
  2. 02 Proven non-irritant and non-sensitizer in human skin irritation/sensitization tests (aqueous hydrolyzed silk).
  3. 03 Suggested use level for Cocoyl Hydrolyzed Silk in cosmetic formulations.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Cocoyl Hydrolyzed Silk is best incorporated into anhydrous formulations or added to the oil phase of an emulsion. Related hydrolyzed silk proteins are noted for stability within a pH range of 4.0-6.0 and generally across a wide pH spectrum.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
10%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Hydrolyzed Silk, the broader category from which Cocoyl Hydrolyzed Silk is derived, is safe in current cosmetic uses at concentrations up to 10%. Human skin irritation and sensitization tests at concentrations up to 20% classify it as non-irritant and non-sensitizer. While generally safe for most skin types, individuals with specific sensitivities or known allergies to silk proteins should exercise caution.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Cocoyl Hydrolyzed Silk is a valuable multi-functional ingredient offering superior hydration, protective barrier formation, and comprehensive skin conditioning for a wide range of skin types, supported by a strong safety profile.

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