PEG-150 Pentaerythrityl Tetrastearate

PEG-150 pentaerythrityl tetrastearate is a large synthetic molecule derived from polyethylene glycol (PEG) chemistry. It belongs to the class of non-ionic emulsifiers — ingredients designed to stabilise mixtures of oil and water that would normally separate.In skincare products, it functions primarily as a viscosity agent and emulsifier, helping to create stable, uniform textures and prevent ingredient separation. It typically appears in creams, lotions and other emulsified formulations.

PEG-150 pentaerythrityl tetrastearate works by positioning itself at the boundary between oil and water phases in a formulation. One part of the molecule attracts to oils whilst another attracts to water, allowing these normally incompatible components to mix smoothly and remain stable.Because of its large molecular size, this ingredient does not penetrate the skin barrier. It remains on the surface and within the formulation itself, functioning as a 'behind-the-scenes' ingredient rather than providing direct skincare benefits.

This ingredient is typically not something you need to use differently from other products. If you are formulating or selecting products that contain it, simply follow the usage recommendations provided on the product label. Like all emulsifiers, it works best when part of a well-balanced formulation.

PEG-150 pentaerythrityl tetrastearate is generally well-tolerated and has demonstrated safety in cosmetic use. Those concerned about fungal acne may wish to review their full product ingredient list, as sensitivity to this ingredient in particular is not established.