The benefits of CPTG Certified Pure Therapeutic Grade® essential oils can be realized through several delivery methods: aromatically, topically, and internally. doTERRA helps facilitate the different options for the use of essential oils in their various forms by providing quality products that follow traditional applications as well as more technologically advanced applications with state-of-the-art diffusers. Using a variety of application methods can offer a unique and exciting experience with each oil. Be sure to refer to the essential oil usage charts and follow usage recommendations to ensure safe application.