Yes. Sodium Hydroxide is also known as Lye, an essential ingredient in soap making. Lye and oils react together to create soap, therefore no lye is in the final product. In our recipes the amount of oil is always greater than the needed lye so that our bars are moisturizing and gentle to the skin. Look for "Saponified Oils" in our ingredients, that means that Lye was used to saponify them.