Science
Mechanism of Action
This ingredient functions by being a hydrolyzed form of casein protein, where its structure is broken down into smaller, more water-soluble peptides and free amino acids. Its amphiphilic nature, possessing both hydrophobic and hydrophilic domains, allows it to interact effectively with water and absorb moisture, thereby conditioning the skin and helping to maintain its good condition.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
There is no indication in the research data that this ingredient is commonly associated with dusting concerns.
The Formula
Formulation
Stability
Hydrolyzed casein demonstrates enhanced water solubility and readily absorbs moisture, attributed to its reduced molecular size, increased hydrophilicity, and net charge. For optimal stability and emulsion capacity, a pH range of 6-7 is recommended, with maximum stability observed around pH 8. Casein micelle dispersions are stable between pH 5.5–7.0 for up to 4 weeks. However, significant chain hydrolysis presents a very high risk below pH 3.
Conflicts
- High risk of chain hydrolysis below pH 3
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Hydrolyzed Casein and related milk protein derivatives safe for use in cosmetics at current practices and concentrations, with safety tests showing no irritation or sensitization up to 30%. It is generally recognized as safe (GRAS) by the FDA. The highest reported concentration in leave-on face and neck skincare is 0.1%. EWG Skin Deep classifies it with 'LOW' concern across multiple toxicity categories. No specific SCCS opinion was found.
Your Skin
Skin Compatibility
Our Assessment
Verdict
HYDROXYPROPYLTRIMONIUM HYDROLYZED CASEIN is a valuable skin conditioning agent, enhancing moisture absorption and maintaining skin health with an excellent safety profile.
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