Back to Ingredient Dictionary

PEG-4

Description

PEG-4, or polyethylene glycol 4, is a versatile synthetic compound widely used in skincare and cosmetic formulations. This water-soluble polymer acts as an effective humectant and emollient, helping to attract and retain moisture in the skin. With a low molecular weight, PEG-4 can penetrate the skin's upper layers, enhancing hydration and improving overall skin texture.

In skincare products, PEG-4 serves multiple functions. It acts as a solvent, helping to dissolve and disperse other ingredients uniformly throughout the formulation. This property makes it valuable in creating stable, homogeneous products. Additionally, PEG-4 functions as a surfactant, reducing surface tension between ingredients and facilitating better mixing of oil and water-based components.

PEG-4 is generally well-tolerated by most skin types and is considered safe for use in cosmetic applications. Its ability to enhance the penetration of other active ingredients makes it a popular choice in various skincare formulations, including moisturizers, serums, and cleansers. However, individuals with sensitive skin should perform a patch test before using products containing PEG-4, as with any new skincare ingredient.