NEW unused/unopened dōTERRA Litsea essential oil 15 mL. Expiry 10.2025. Litsea, also known as "mountain pepper," is an evergreen tree or shrub that is commonly distributed across regions including Japan, Taiwan, Southern China, and Southeastern Asia. This spice serves as a popular condiment in the native cuisine of Taiwan. Litsea essential oil is derived through the steam distillation of the fresh, ripe fruits of the Litsea tree and is often referred to as May Chang oil.