Science
Mechanism of Action
As an amphoteric molecule, Cocoyl Glutamic Acid possesses both positive and negative charges, enabling it to efficiently emulsify and lift both hydrophobic (oil-based) and hydrophilic (water-soluble) impurities from the skin surface. It functions by decreasing the surface tension between oil and water, facilitating thorough yet gentle removal of dirt and sebum without compromising the skin's natural moisture barrier. This ingredient contributes to a rich, creamy lather and also acts as an emulsifier, stabilizing product formulations. On the skin, it provides conditioning and softening benefits, aids in maintaining optimal hydration, and helps protect against dryness. It intrinsically supports the skin's slightly acidic pH. Furthermore, dermal enzymes can degrade it into glutamic acid and fatty acids, which are precursors for the skin's Natural Moisturizing Factors (NMFs).
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 A clinical patch test involving 105 patients demonstrated that sodium cocoyl glutamate, a common salt form of this ingredient, did not induce skin irritation, affirming its very low irritant potential as a surfactant in cleansers.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Cocoyl Glutamic Acid demonstrates optimal stability and effectiveness within a pH range of 5.0 to 7.0. While it can tolerate slightly acidic conditions (down to pH 4.0), its foaming and cleansing capabilities may diminish at very low pH levels. For peak performance in rinse-off products, a pH between 5.5 and 6.5 is generally recommended. It dissolves more readily in warm water, ideally around 70°C.
Conflicts
- Avoid co-formulation with azo and diazo compounds, as their reaction can generate toxic gases.
- Strong reducing agents may react to form flammable gases.
- Cannot be effectively thickened by salt alone; requires polymeric thickeners such as lauryl glucoside or various gums (e.g., xanthan gum).
- May influence the efficacy of preservatives, necessitating careful testing and potential adjustments in preservative systems.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed Cocoyl Glutamic Acid, along with related amino acid alkyl amides, as safe for use in cosmetics at current concentrations and practices. Maximum reported use concentrations reach 24% in both rinse-off and leave-on formulations. Sodium Cocoyl Glutamate, a common derivative, is generally recognized as safe (GRAS) by the FDA for cosmetic applications.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Cocoyl Glutamic Acid is a valuable, gentle surfactant that provides effective cleansing and conditioning across all skin types, supporting skin health without irritation.
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