Science
Mechanism of Action
Serica Extract functions primarily as a potent humectant, drawing and retaining moisture to deeply hydrate the skin, thereby enhancing elasticity and diminishing the appearance of fine lines. It reinforces the skin's natural moisture barrier by promoting key protein production and amino acid retention. Beyond hydration, it actively combats oxidative stress through metal-chelating and neutralizing reactive oxygen and nitrogen species, thus safeguarding collagen and elastin. Its affinity for keratin allows it to form a delicate protective film, improving skin microtopography and corneocyte cohesion for a smoother texture. Furthermore, Serica Extract inhibits tyrosine activity, crucial for melanin formation, leading to skin brightening, and exhibits antibacterial and anti-inflammatory properties.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Topical application of 3% Serica Extract demonstrated moisture absorption comparable to 60% glycerol without pore clogging, while also reducing tyrosine activity by over 50% to inhibit melanin and promote skin whitening.
- 02 An 8% concentration significantly improved skin hydration and reduced pigmentation in clinical trials involving renal patients.
- 03 Regular topical treatment over 4-8 weeks consistently led to long-term improvements in skin texture, reduced dryness, enhanced luminosity, increased firmness, and a reduction in wrinkle depth.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Serica Extract maintains stability within a pH range of 4.0 to 8.0. However, extreme pH values and temperatures can induce degradation. Its stability and performance can be enhanced when formulated with polymers or other stabilizing materials, with optimal crosslinking observed between pH 7.0-8.5 and temperatures of 30-40 °C.
Safety
Safety Profile
The CIR Expert Panel has deemed silk protein ingredients, including Serica Extract, safe for cosmetic use. Dermal toxicity studies consistently show it to be non-toxic, non-irritating, and to lack skin sensitization potential. While some general silk proteins were tested as mild skin irritants in specific scenarios, the overall risk of irritation and sensitization is low. In vitro studies of water-extracted sericin confirmed non-mutagenic and non-genotoxic properties, with a No Observed Adverse Effect Level (NOAEL) of 1 g/kg/day in rats. An in vitro study noted potential harm to a murine hybridoma cell line at 1.0%, but this specific finding is not indicative of general topical safety for human skin. Individual sensitivities vary, and patch testing is always recommended.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Serica Extract is a highly valuable ingredient offering significant hydrating, protective, and anti-aging benefits, making it suitable for a wide range of skin types and formulations.
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References
Sources