Pepper shrub, also known as Kava (4 letters), is a tropical evergreen shrub native to the South Pacific islands. It has been used for centuries by islanders for its calming effects and medicinal properties. The root of the shrub is dried, ground into a powder, and then mixed with water to make a beverage. Pepper shrub is known for its mild sedative effects and is often used to treat anxiety, insomnia, and stress.