Trader Joe's Peppermint & Tea Tree Shampoo Bar provides a new way to shampoo. Instead of a liquid, packaged in a plastic bottle, This Peppermint & Tea Tree Shampoo is an oval shaped, solid Bar. The base of this Shampoo Bar is saponified oils (oils that have been converted into soap by reaction with alkali) that include coconut oil, olive oil, and castor oil.