PEG …

PEG/PPG-19/19 Dimethicone is a hybrid silicone ingredient that functions primarily as an emulsifier in skincare products. It belongs to a class of ingredients designed to stabilise formulations by helping water-based and oil-based components mix evenly, preventing separation.This ingredient is used sparingly in skincare—appearing in roughly 0.1% of products—because most formulations employ alternative stabilising systems. When present, it typically works alongside other emulsifiers to maintain product texture and consistency over time.

PEG/PPG-19/19 Dimethicone works by positioning itself at the boundary between water and oil molecules. Its molecular structure has both water-loving (hydrophilic) and oil-loving (lipophilic) ends, allowing it to hold these normally incompatible phases in suspension within a single product.This stabilising action prevents the formula from separating into layers, which would compromise both efficacy and user experience. The result is a uniform, pourable or spreadable product throughout its shelf life.

This is a background ingredient rather than an active treatment, so there are no special usage instructions. Simply use the product as directed by the manufacturer. If you prefer silicone-free formulations, check product labels, as this ingredient is uncommon enough that silicone-free alternatives are widely available.

PEG/PPG-19/19 Dimethicone is generally well-tolerated and is approved for use in cosmetics across major regulatory bodies. Some individuals prefer to avoid silicones altogether; if this applies to you, select silicone-free products instead.