Science
Mechanism of Action
This ingredient actively creates a lightweight, flexible film on the skin's surface, which precisely limits transepidermal water loss (TEWL) and offers a defense against external irritants. Its unique chemical structure, combining a hydrophilic polyethylene glycol (PEG) segment with a hydrophobic dimethicone backbone, allows it to serve as an effective emulsifier in water- and alcohol-soluble formulations. On the skin, it imparts a desirable silky finish and can temporarily diminish the appearance of fine lines and wrinkles.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
PEG/PPG-18/12 DIMETHICONE is recognized for its robust stability. Similar to other polyethylene glycols (PEGs), it maintains integrity across a broad spectrum of pH conditions, ensuring formulation reliability.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel, in 1982 and reaffirmed in 2005, concluded that 'Dimethicone Copolyol' (which includes PEG/PPG-18/12 DIMETHICONE) is 'safe as used' in cosmetic applications. However, in 2014, the Panel issued an 'insufficient data announcement' for a wider group of 111 polyoxyalkylene siloxane copolymers (including this specific ingredient) to solicit additional data points such as molecular weight, impurities, dermal penetration, irritation, and sensitization. The FDA, for its part, generally considers dimethicone copolyol a safe skin protectant at low concentrations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG/PPG-18/12 DIMETHICONE is a valuable, multifunctional ingredient that enhances skin feel and hydration, supports stable formulations, and is well-tolerated across all skin types, despite ongoing calls for more detailed data on a broader category of related compounds.
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References
Sources