Butylene Glycol
"Butylene glycol, an alcohol derived from petroleum or vegetables, is a water-soluble compound. In the realm of cosmetics, it's commonly available in liquid form and is present in numerous skincare products, including cleansers, moisturizers, masks, as well as makeup and haircare products. This versatile ingredient can be used for various purposes in skincare formulations: it acts as a humectant (attracting water to the skin) while also functioning as a solvent and emollient, providing softening properties to the skin."