Science
Mechanism of Action
This ingredient functions through a dual mechanism. As a PEG derivative, it acts as a humectant, drawing moisture from the environment to the skin, thereby promoting hydration. It also serves as a solvent, facilitating the dissolution and improved delivery of other active cosmetic ingredients. Concurrently, its cocamide carboxylate component imparts surfactant properties, enabling it to reduce surface tension for effective cleansing, stabilize oil-in-water mixtures as an emulsifier, and dissolve oil-soluble substances as a solubilizer.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Aqueous solutions of SODIUM PEG-8 COCAMIDE CARBOXYLATE are stable at room temperatures, with its PEG bonds resisting hydrolysis. Dissolution in warm water, specifically 80-90°C, does not adversely affect its stability. However, PEGs are susceptible to oxidative degradation upon exposure to air; therefore, minimizing exposure to elevated temperatures or oxygen, or incorporating antioxidants, can effectively limit degradation.
Conflicts
- phenol
- sorbitol
- tannic acid
- salicylic acid
- penicillin
- bacitracin
- plastics (may affect integrity)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that PEGs cocamine and related ingredients, including cocamide carboxylates, are safe in cosmetic formulations at current use concentrations when formulated to be non-irritating. PEG-8 is FDA and CIR approved for topical use on healthy skin but must not be applied to broken or compromised skin. There is a potential for PEGs to be contaminated with ethylene oxide and 1,4-dioxane, both of which can pose toxicity concerns. Formulations should also aim to minimize the potential formation of hydroperoxides. This ingredient is explicitly not recommended for use on sensitive skin.
Your Skin
Skin Compatibility
Our Assessment
Verdict
SODIUM PEG-8 COCAMIDE CARBOXYLATE is a valuable multifunctional ingredient for its humectant, solvent, and surfactant properties, though its inclusion requires careful formulation to ensure non-irritancy and is contraindicated for sensitive or broken skin.
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