PEG-10 Isostearate

PEG-10 Isostearate is a synthetic emulsifier derived from polyethylene glycol (PEG) and isostearic acid. It functions as a surfactant, meaning it has the ability to reduce the surface tension between oil and water-based ingredients, allowing them to mix together smoothly in a formula.In skincare products, it serves a primarily functional rather than active role. Its main purpose is to create stable, homogeneous textures and improve product spreadability and feel on the skin.

PEG-10 Isostearate works by positioning itself at the boundary between oil and water molecules. One end of the molecule is attracted to oils, whilst the other is attracted to water. This allows these normally incompatible ingredients to remain evenly distributed throughout the product rather than separating.The ingredient itself does not penetrate the skin barrier significantly; it remains largely on the surface as part of the product vehicle, ensuring other active ingredients are delivered effectively.

PEG-10 Isostearate is a background ingredient you will encounter in many formulations; no special application technique is required. Simply use the product as directed. If you have known sensitivities to PEG-derived ingredients, patch test first, though reactions are typically rare.

Generally well-tolerated in cosmetic formulations. Those with documented PEG sensitivity or suspected fungal acne may wish to avoid products containing this ingredient, though evidence linking it to malassezia is limited.