Castile Soap is named for its place of origin Old Castile a former kingdom of Northern Spain dating back to the 10th Century. In our high-tech, rapidly changing world Castile Soap remains true to its beginnings - an uncomplicated, natural blend for mild, yet effective cleansing. Our traditional Castile Soap uses a pure vegetable oil base and contains no animal fats and no synthetic detergents. Use this multi-purpose, biodegradable soap for all your cleansing needs.