Science
Mechanism of Action
It functions by depositing a breathable, semi-permeable film across the epidermis, significantly reducing trans-epidermal water loss (TEWL). Rich in essential amino acids like glutamic acid and proline, it mimics the skin's Natural Moisturizing Factor (NMF) to provide biological hydration while physically smoothing the skin's surface.
Research
Clinical Evidence
High confidence2%
Key findings
- 01 Concentrations of up to 2% have been verified in leave-on skin preparations for safe and effective conditioning without adverse reactions.
- 02 Safety benchmarks established through Human Repeated Insult Patch Testing (HRIPT) on related milk proteins show no sensitization or irritation even at high 30% concentrations.
Transparency
Dusting Analysis
While it is effective as a label-claim ingredient at very low levels (0.1%), therapeutic barrier support typically requires concentrations closer to 1-2%. Formulations using it below 0.1% are likely 'dusting' for marketing purposes.
The Formula
Formulation
Stability
The ingredient is highly stable within a neutral to slightly alkaline range but will precipitate (curdle) if the pH drops below 4.5. It maintains thermal stability up to 140°C, though excessive electrolytes may cause aggregation.
Synergies
- Glycerin
- Hyaluronic Acid
- Ceramides
Conflicts
- Protease enzymes
- Strong acids (pH < 4.5)
- High ethanol concentrations
- High concentrations of calcium ions
Safety
Safety Profile
Classified as GRAS (Generally Recognized As Safe) by the FDA. As a milk-derived protein, those with severe dairy allergies should exercise caution, though topical risk is minimal.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An excellent biocompatible film-former that provides reliable barrier protection and texture refinement for dry and sensitive skin types.
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References
Sources