Peppermint Essential Oil is one of the best known and most popular scents in the world. Peppermint has a soothing, calming scent that energizes and refreshes the spirit. Using in a diffuser is a great way to wake up and start the day with strength and energy. It also works well to re-energize you when you are feeling fatigued and improves memory and mental focus. It even improves self-esteem.