WHAT IT IS: PEG-400 is a polyethylene glycol used as a solvent and humectant support material in cosmetic formulas.
WHAT IT DOES / EVIDENCE: It helps dissolve certain ingredients and contributes to the feel and spread of a formulation. Its average polymer size is part of its grade identification. It is not the same as a strong exfoliating active and does not independently boost collagen or remove pigmentation.
IN THE FINISHED FORMULA: Its significance is primarily formulation performance and surface moisture support. The actual function depends on raw-material identity and product design.
Usage & cautions
Use only as formulated; sensitivity is primarily to the completed product.
Information approach
Consumer-friendly summaries are informed by established cosmetic ingredient references such as INCIDecoder and Paula’s Choice Ingredient Dictionary, while avoiding turning ingredient-level evidence into medical claims about the finished product.
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