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. All soaps are certified organic under the USDA National Organic Program. All soaps are also certified Fair Trade. Packaged in 100% post-consumer recycled (PCR) plastic bottles.