Science
Mechanism of Action
This copolymer primarily creates a resilient, non-occlusive film on the skin's surface. Related molecular structures suggest it may also function as a humectant, attracting environmental moisture, which helps reduce transepidermal water loss and protect the skin from external stressors. Its polymeric nature may also contribute to product texture and viscosity.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient exhibits optimal stability within an acidic to neutral pH range, specifically between pH 1.70 and 5.80. Exposure to basic solutions (above pH 7.14) may lead to degradation. The 'castorate' component suggests the copolymer has been modified, likely to enhance its flexibility and ease of application, as unmodified forms can be brittle.
Safety
Safety Profile
While glycerin itself is considered safe by the CIR Expert Panel, this specific copolymer has not undergone direct safety assessment by CIR. A structurally related compound, 'poly(castor oil-co-glycerin-co-phthalic anhydride)', is approved by the FDA as an indirect food additive. For other related phthalic copolymers, adverse reactions are generally uncommon, though patch testing has been recommended.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Possessing promising film-forming capabilities, definitive assessment requires specific clinical and safety data directly pertaining to GLYCERIN/PHTHALIC ACID COPOLYMER CASTORATE.
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