Science
Mechanism of Action
The extract's primary components, Sericin and Fibroin, work synergistically on the skin. Sericin functions as a potent humectant, significantly boosting skin hydration and forming a delicate, protective film that minimizes transepidermal water loss and irritation. This protein also promotes skin elasticity, supports collagen production to reduce the appearance of fine lines, and contributes to skin regeneration. Furthermore, Sericin exhibits anti-inflammatory, antioxidant, and antibacterial effects, alongside inhibitory properties against elastase and tyrosinase, which can diminish melanin formation and offer UV protection. Fibroin complements these actions by providing additional antioxidant, anti-inflammatory, and antimicrobial benefits, while also enhancing skin elasticity and stimulating collagen synthesis. The extract notably binds to keratin in the skin, facilitating its beneficial actions.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Significantly improved wound healing in rats and increased skin hydration in renal patients, though skin depigmentation was observed at this concentration. (Aramwit and Sangcakul, 2007)
- 02 Demonstrated strong moisturizing and hygroscopic efficacy on skin, comparable to a 60% glycerol concentration. (ResearchGate)
- 03 Reduced bacterial colony counts in studies, indicating antimicrobial effects. (Jassim and Al-Saree, 2022 review)
- 04 Sericin-based electrospun nanofiber films (used in eye contour patches) increased skin elasticity by +35.1% and improved skin smoothness (Ra: -30.7%, Rz: -26.6%) in 20 participants, though a decline in hydration was observed. (MDPI, 2025)
- 05 Exhibited antioxidant properties and inhibitory effects on bacterial growth, DNA synthesis, hemolysis, and biofilm formation against skin pathogenic bacteria. (PubMed/ResearchGate, 2024)
Transparency
Dusting Analysis
While the Cosmetic Ingredient Review (CIR) panel notes that typical low cosmetic use concentrations (0.00047%) are not a concern for hypopigmentation, most clinical studies demonstrating significant benefits for hydration, antimicrobial action, or wound healing utilize concentrations of 2% to 8%. Therefore, if Moth Cocoon Extract is present in a product at concentrations significantly below 2%, it may be considered a 'dusting' ingredient, included primarily for label appeal rather than tangible active benefits.
The Formula
Formulation
Stability
Cosmetic-grade sericin is optimally stable within a pH range of 4.5 to 7.0. Extraction methods employing extreme pH can significantly degrade the protein. Sericin is highly hydrophilic, with cosmetic-grade forms expected to be at least 80% soluble in water, though solubility in cold water may vary. Lower molecular weight fractions (e.g., 5000-7000D or <20 kDa) are preferred for enhanced skin penetration and moisturizing effects. Controlled moisture content (below 10%) is critical to prevent microbial growth.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Panel has deemed Sericin and other silk protein ingredients safe for use in cosmetics. Although an 8% sericin cream showed skin depigmentation in one study, the CIR panel clarified that at typical low cosmetic use concentrations (0.00047%), hypopigmentation would not be a concern. The ingredient is generally considered safe with low toxicity and approved by regulatory bodies like the European Cosmetics Regulation. However, individual sensitivities can vary, making patch testing advisable. Further investigation into the long-term biological effects of sericin byproducts is recommended.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Moth Cocoon Extract is a valuable, multifunctional ingredient that profoundly enhances skin hydration, elasticity, and overall resilience through its potent humectant, antioxidant, and regenerative properties, with a strong safety profile.
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References
Sources