Science
Mechanism of Action
This ingredient works by creating a lightweight, occlusive barrier on the skin's surface, which effectively minimizes trans-epidermal water loss and locks in moisture, resulting in improved softness and slip. As a surfactant, it also aids in the even distribution of formulations, improves product texture, and can enhance the density and stability of foam in cleansing products.
Research
Clinical Evidence
Medium confidence1-5%
Key findings
- 01 The Cosmetic Ingredient Review (CIR) in 2014 determined PEG-8 dimethicone safe for cosmetic use within a concentration range of 0.024% to 5.6%.
- 02 Typical use levels for PEG-8 Dimethicone in cosmetic formulations generally range from 1% to 5%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
For optimal stability, formulations should maintain a pH between 5.5 and 8.5. This ingredient should be incorporated into the water phase and not subjected to temperatures exceeding 50°C (122-125°F). Hydrolysis can occur outside the optimal pH range, with degradation observed faster at lower pH.
Safety
Safety Profile
The 2014 CIR assessment deemed PEG-8 dimethicone safe for cosmetic use within concentrations of 0.024%–5.6%. However, a critical consideration for this ingredient is the potential for 1,4-dioxane contamination during manufacturing, a known toxic impurity. Therefore, meticulous quality control and proper filtration are essential. Products containing Hydroxypropylcocoate PEG-8 Dimethicone can achieve EWG VERIFIED status, provided they meet specific use restrictions and warnings established through EWG's review of company data, explicitly addressing the concerns over potential toxic impurities.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This ingredient offers valuable emollient and conditioning benefits with low irritancy and comedogenicity; however, stringent quality control is paramount to mitigate the significant risk of 1,4-dioxane contamination during manufacturing.
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