Science
Mechanism of Action
Primarily composed of sericin, Silkworm Cocoon Extract acts as a natural humectant, effectively attracting and retaining moisture to deeply hydrate the skin and fortify its moisture barrier. Its amino acid profile closely mirrors the skin's Natural Moisturizing Factor (NMF). Sericin exhibits a strong affinity for keratin, forming a substantive, protective film on the skin surface that minimizes transepidermal water loss and irritation, promoting a smooth, silky texture and improved elasticity. Beyond hydration, it stimulates collagen synthesis, enhances skin resilience, and reduces inflammation by inhibiting interleukin-6 (IL-6). The extract also demonstrates significant antioxidant properties and can inhibit tyrosinase activity and melanin production, contributing to skin brightening.
Research
Clinical Evidence
Medium confidence3%
Key findings
- 01 A 3% sericin solution has demonstrated moisturizing and hygroscopic effects comparable to 60% glycerol, effectively hydrating the skin without pore occlusion.
- 02 Clinical trials involving 20 participants showed that sericin-based nanofiber films increased skin elasticity by 35.1% and improved smoothness (Ra: -30.7%, Rz: -26.6%), though a decline in hydration was noted.
- 03 Golden silkworm cocoon extract, used in cosmetic compositions from 0.00001% to 30.0%, has exhibited antioxidant, anti-aging, skin brightening, collagen synthesis, and elasticity-improving effects, alongside inhibitory actions on MMP-1 production and UV-induced inflammatory cytokines.
- 04 Low-molecular-weight sericin (below 10 kDa) has been shown to penetrate the skin more effectively, enhancing its bioavailability and efficacy.
Transparency
Dusting Analysis
Effective concentrations of Silkworm Cocoon Extract are reported across a wide range, with broad benefits observed from 0.00001% and significant hydrating effects at 3%. The maximum beneficial concentration documented is 30.0%, indicating it is utilized at functional levels rather than as a minimal 'dusting' ingredient.
The Formula
Formulation
Stability
Sericin powders or solutions should be stored in cool, dark environments, as exposure to heat and light can accelerate degradation. Sericin's solubility varies by molecular weight; typically, lower molecular weight sericin, often obtained through protease degradation, demonstrates improved water solubility, particularly in cold water.
Safety
Safety Profile
While generally considered well-tolerated, rare instances of skin irritation and Type I hypersensitivity to silk proteins have been documented, making patch testing advisable. The CIR Panel requested but did not receive specific data for 'Silkworm Cocoon Extract' during its review of silk protein ingredients. Concerns regarding potential pesticides and heavy metals have been noted for silk protein ingredients, although specific data for this extract were not available to the panel.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Silkworm Cocoon Extract is a valuable, multi-functional ingredient that significantly improves skin hydration, elasticity, and overall health through its humectant, collagen-boosting, and protective properties, with generally low irritation potential.
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References
Sources