Polyethylene glycol

The water solubility, moisturizing properties, and emulsifying ability of PEG make it a common ingredient in skincare and personal care products:
Humectant: Low molecular weight PEG (e.g., PEG-200, 400) can absorb environmental moisture and lock in skin hydration, used in creams, toners, hand lotions, etc., to alleviate dryness;
Emulsifier and Thickener: Medium molecular weight PEG (e.g., PEG-600, 1000) helps blend oil and water components, stabilizing emulsion systems (e.g., lotions, sunscreens), while increasing product viscosity and improving user experience;
Cleaning Aid: PEG derivatives (e.g., PEG-40 hydrogenated castor oil) enhance foaming and cleansing power in facial cleansers and body washes, while reducing the irritation of surfactants on the skin;
Hair Conditioning Agent: In shampoos and conditioners, it improves hair smoothness, reduces combing friction, and prevents dryness and split ends.