Science
Mechanism of Action
As a polysiloxane-based polymer, Polysilicone-19 is structurally characterized by repeating siloxane (Si-O-Si) units combined with organic groups. This unique architecture enables it to form a durable, water-resistant, and breathable film upon application to the skin. This film acts as a conditioning agent, reducing trans-epidermal water loss by forming a protective barrier that seals in moisture. The siloxane backbone provides characteristic silicone properties, while organic side chains ensure compatibility with other cosmetic ingredients and contribute to an improved sensory feel. It also functions to enhance the longevity and efficacy of other active ingredients within formulations.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Typical addition of 1.0-3.0% for efficient protection of surfaces against UV-damage in care agents, suggesting potential protective benefits in skincare applications.
- 02 In hair care, 12% provided superior protection of hair fiber keratin integrity in conditioner applications.
- 03 In hair care, approximately 10% protected hair fiber keratin integrity in shampoo applications.
- 04 Reduced permanent hair color fade by over 40% in both shampoo and conditioner, and demi-permanent fade by over 50% in conditioner (concentrations unspecified).
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polysilicone-19 is soluble in various organic solvents and readily disperses in both oil- and water-based formulations. It is valued for improving product durability, texture, spreadability, and longevity. It is a versatile component that aids in creating stable emulsions while imparting water resistance and a smooth, soft texture without greasy residue.
Synergies
- Enhances the efficacy of active ingredients
- Improves product durability and longevity
- Contributes to stable emulsion formation
- Imparts water resistance to formulations
Safety
Safety Profile
Polysilicone-19 is generally regarded as safe for cosmetic use, demonstrating non-irritating and non-sensitizing properties when applied topically. It currently lacks specific Cosmetic Ingredient Review (CIR) or Scientific Committee on Consumer Safety (SCCS) reports; however, related polysilicones have been evaluated. It is not approved as a UV filter drug by the FDA for use in US sunscreen products. Environmental concerns regarding its non-biodegradability and potential accumulation in aquatic environments have been acknowledged.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polysilicone-19 is a valuable ingredient for precision skincare, effectively forming a protective, breathable film that conditions skin, enhances moisture retention, and improves product longevity and texture.
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