Why does your soap contain caustic soda?

Sodium hydroxide. Also known as caustic soda or lye.

There is no true soap without lye and there’s a huge difference between “made with lye” and “containing lye.” This subject can be somewhat confusing, as caustic soda is known to cause severe burns to the skin.

But the truth is that soap is the result of a chemical reaction called saponification that occurs between lye and a type of molecule called a triglyceride (a fat or oil), where both substances are chemically transformed, creating soap and natural glycerin. Neither of the original ingredients exists anymore and all the lye is consumed in the reaction.

So, while our soap is made with lye, the end product does not contain lye.