Our castile soap bar is made with 100% pure extra virgin olive oil (no other added plant oils). It is very mild and gentle, suitable for sensitive or mature skin, and provides superb conditioning properties. It’s available in a regular-sized 90g-100g as well as a larger 180g-200g bar. What is Castile Soap? Castile soap is a name used in English-speaking countries for olive oil-based soap made in a style similar to that originating in the Castile region of Spain. Traditionally made with olive oil, in many parts of the world and still is. Can be either bar soap made with sodium hydroxide or liquid soap made with potassium hydroxide. Ingredients : Olive Oil (Extra Virgin), Distilled Water, Caustic Soda, Caustic Potash, Rosemary Oil Extract (Antioxidant)