Science
Mechanism of Action
Sericin functions as a natural humectant, closely mirroring the skin's Natural Moisturizing Factor (NMF) in its amino acid composition, enabling efficient water binding. It forms a semi-occlusive film on the skin surface, which actively minimizes transepidermal water loss (TEWL) and bolsters hydration. Its antioxidant properties, including scavenging reactive oxygen species (ROS) and chelating metal ions, contribute to anti-aging by stimulating collagen production, improving skin elasticity, and diminishing fine lines. Furthermore, sericin exhibits anti-inflammatory effects by modulating key cytokines like interleukin 1 and TNF-α, promotes wound healing through cell proliferation and migration, and reduces hyperpigmentation by inhibiting tyrosinase activity and associated inflammation.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Demonstrated significant improvement in wound healing in rats and enhanced skin hydration in renal patients experiencing dry and itchy skin.
- 02 Achieved moisture absorption levels comparable to a 60% glycerol solution, highlighting its potent hygroscopic properties.
- 03 Reduced tyrosinase activity by over 52%, effectively inhibiting melanin production and promoting skin brightening.
- 04 In a formulation with niacinamide and signaline, it led to marked improvements in stratum corneum hydration, barrier function, skin elasticity, and reduced roughness in women aged 40-70 years.
Transparency
Dusting Analysis
Sericin's efficacy has been demonstrated at specific concentrations in various clinical and in vitro studies, indicating functional benefits at specified levels rather than being included solely for 'dusting' purposes.
The Formula
Formulation
Stability
Sericin is water-soluble with an optimal pH range for cosmetic formulations typically between 4.5 and 7.0. It is susceptible to degradation in strong acidic or alkaline conditions, and under elevated temperatures or pressures. Aqueous solutions generally have poor storage stability, prone to gel formation and spoilage. Dried sericin can crystallize, making redissolution challenging unless processed in hot water (e.g., 90°C for 5 minutes) to maintain molecular weight and enhance stability. Low molecular weight sericin (below 10 kDa) is favored for improved skin penetration in cosmetic applications.
Conflicts
- strong acids
- strong bases
- elevated temperatures (in solution)
- high pressure
Safety
Safety Profile
The CIR Expert Panel (2015) has affirmed sericin's safety for cosmetic use based on available data. While generally well-tolerated, rare instances of skin irritation, redness, itching, or Type I hypersensitivity have been reported in individuals with documented silk allergies. Therefore, patch testing is recommended for those with known silk sensitivity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sericin is a valuable multi-functional ingredient that significantly enhances skin hydration and barrier function, provides anti-aging and brightening benefits, and supports wound healing, making it suitable for a wide range of precision skincare applications.
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References
Sources