Science
Mechanism of Action
This ingredient functions as an antimicrobial by selectively targeting and disrupting the cell walls of acne-contributing bacteria, such as Cutibacterium acnes, through cytoplasmic membrane permeabilization, thereby inhibiting their growth. Beyond its bacterial control, POLYLYSINE HBR demonstrates film-forming properties, creating a protective layer on the skin's surface to minimize transepidermal water loss (TEWL) and lock in moisture. It also exhibits antioxidant capabilities, potentially aiding in the reduction of photodamage visibility and contributing to product preservation.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 A study demonstrated that polylysine dendrigaft, a form of polylysine, effectively modulates Cutibacterium acnes strains, suggesting its role in preventing acneic skin conditions. It also exhibited dose-dependent antimicrobial effects against bacteria like E. coli O157:H7, S. typhimurium, and P. aeruginosa PAO1 within a concentration range of 0.78-100 µg/mL by increasing bacterial cell permeability.
Transparency
Dusting Analysis
No data is available to suggest that POLYLYSINE HBR is commonly 'dusted' or used at ineffective concentrations for marketing purposes. Its mechanisms are noted to be dose-dependent in studies.
The Formula
Formulation
Stability
POLYLYSINE HBR is a crystalline solid readily soluble in water, a characteristic enhanced by its HBr component. Its secondary structure is influenced by environmental factors such as decreasing pH or increasing temperature. Optimal adsorption onto surfaces occurs at pH 11, with reduced adsorption under more acidic conditions. To neutralize HBr, it can be dissolved in a neutral buffer.
Safety
Safety Profile
While general polylysine has been utilized as a food preservative due to its antimicrobial properties, suggesting a level of safety for specific applications, research-grade POLYLYSINE HBR products are often labeled 'for R&D use only, not for drug, household, or other uses'. A specific comprehensive safety assessment by the Cosmetic Ingredient Review (CIR) is currently unavailable.
Your Skin
Skin Compatibility
Our Assessment
Verdict
POLYLYSINE HBR is a valuable multi-functional ingredient offering significant benefits for acne-prone and dry skin through its antimicrobial, hydrating, and barrier-supporting actions, though further comprehensive cosmetic safety data for this specific HBr form would solidify its widespread application.
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