From the doTERRA website:

Peppermint Oil is a Popular Oil

"Essential oils have been used throughout recorded history for a wide variety of wellness applications. The Egyptians were some of the first people to use aromatic essential oils extensively in medical practice, beauty treatment, food preparation, and in religious ceremony. Frankincense, sandalwood, myrrh and cinnamon were considered very valuable cargo along caravan trade routes and were sometimes exchanged for gold.