Butylene Glycol is a multifunctional ingredient in cosmetics it does a bit of everything. A humectant, which means it binds water and pulls hydration to the outer layer of the skin. Enhances penetration by breaking down hard to dissolve ingredients, improves penetration which as a result helps the product perform more effectively. Functions as an emollient by creating a barrier on the skin, which prevents water loss and softens the skin. 🌱VEGAN