The legend of “castile soap” is a bit mysterious but one thing we know for sure: castile soap is the purest, simplest form of liquid soap. Our castile soap is made the old-fashioned way, retaining all the natural glycerin. It’s especially emollient from the high concentration of olive oil in the formula. This soap is also concentrated and won’t harm you or the environment. Pure peppermint essential oil is its scent: refreshing and invigorating with a tingling effect. To ensure freshness, close the cap after each use.