Castile soap comes from the Castile region of Spain where it was originally made with local olive oil.
Today, it’s a soap made mostly of oils, such as: coconut oils, olive oils, and hemp oils. This alkaline soap may also contain avocado oils, almond oils, or walnut oils. The one thing you won’t find is animal fats (which are used in many other traditional soaps), so castile soap is safe for vegans and vegetarians.