PEG-150

PEG-150 is a polyethylene glycol—a synthetic polymer derived from petroleum. In cosmetics, it typically appears as PEG-150 pentaerythrityl tetrastearate, a large, waxy molecule that serves multiple functions in skincare formulations.Its primary roles are to bind ingredients together, help formulations retain water (humectant function), and act as a solvent to dissolve other compounds. Because of its molecular size, it remains largely on the skin's surface rather than penetrating deeply.

PEG-150 works as a humectant by drawing and holding water molecules within a formulation, which can help maintain skin hydration. It also acts as a binder, allowing oil and water-based ingredients to coexist in the same product without separating.Because PEG-150 is a large molecule, it does not penetrate the skin barrier significantly. Instead, it works primarily at the surface level to improve product texture and help deliver moisture to the outer layers of skin.

PEG-150 is a formula ingredient rather than an active compound, so you don't need to use it in any particular way. Simply apply the product containing it as directed. Because it supports hydration and texture, it may work well alongside other hydrating ingredients like glycerine or hyaluronic acid.

PEG-150 pentaerythrityl tetrastearate is considered safe in cosmetics at typical use concentrations. It is generally well-tolerated and unlikely to cause irritation or sensitisation in most people.