Science
Mechanism of Action
This ingredient operates by establishing a breathable, protective film on the skin's surface, which significantly minimizes transepidermal water loss (TEWL), thereby boosting skin hydration and elasticity. As a powerful humectant, it effectively draws and retains moisture within the stratum corneum. Furthermore, it acts as a skin conditioning agent, improving the skin's natural tolerance to external aggressors and preventing dehydration. Its notable chelating properties allow it to bind to metal ions, such as calcium and magnesium, which helps counteract the drying and irritating effects of hard water on both skin and hair.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium Polyaspartate exhibits high water solubility but is insoluble in ethanol and oils. Optimal formulation pH ranges between 8.5 and 11.0; deviations toward acidic conditions can cause polyaspartic acid hydrogels to shrink, while alkaline conditions promote swelling. It imparts a silky-smooth feel and enhances product spreadability without stickiness, and its chelating ability can improve the foaming action of cleansers in hard water.
Synergies
- Hard water cleansing agents (improves foaming)
Safety
Safety Profile
Generally recognized as non-toxic, biodegradable, and biocompatible, with a low irritancy profile for both skin and eyes. Environmental Working Group (EWG) data indicates low concern for acute aquatic toxicity and good biodegradability. Its FDA status as Generally Recognized As Safe (GRAS) for cosmetic use is not explicitly documented in current research.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Polyaspartate is a valuable ingredient for enhancing skin hydration, reinforcing the skin barrier, and providing soothing and chelating benefits across a wide range of skincare and haircare formulations, particularly for dry and sensitive skin types.
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References
Sources