Dr. Bronner's Peppermint Castile Bar Soap tingles the body and clears the mind. Therapeutically used as a mild stimulant, peppermint oil increases vitality and clarity. Completely biodegradable and vegetable-based, Castile Bar Soaps are gentle and effective, perfect for washing body, face or hair. They are also very popular with DIY homemakers. For example, they can be grated to form part of a homemade powdered laundry detergent.