PEG-150 (polyethylene glycol) is an emulsifier that can also be found in soaps, shampoos and body washes. It helps bind ingredients together and keep a formula from separating. PEG-150 is an alcohol that helps hold mixtures of oil and water together. Over time, it is possible for formulas in a product to separate. Adding emulsifiers helps ensure that our products provide the same performance use after use.