Dr. Bronner's Peppermint Castile Liquid Soap is our most popular fragrance. The peppermint essential oil tingles the body and clears the mind. Therapeutically used as a mild stimulant, peppermint oil increases vitality and clarity. These simple, ecologically formulated soaps are gentle enough for washing body, face or hair, but also powerful enough for tasks like dishwashing, mopping, laundry and even pest control.