This type of ingredient is used in skincare as a humectant, emulsifier, surfactant, conditioner, and penetration enhancer. It is important to keep in mind that iS Clinical does not utilize any ingredients that contain contaminants, nor do we utilize ingredients at high values that could potentially result in toxicity. Unlike many brands, iS Clinical only formulates with the highest quality of ingredients available on the market, often pharmaceutical grade, and we do not work with anything cosmetic grade or lower. PEG compounds are also found in topical and oral medications and foods that we eat. It is important to know that studies surrounding these compounds are built around their presence in other formulations outside of skin care, and also studied singularly at larger quantities that could lead to toxicity. These studies are irrelevant to skincare.