Essential Oil | 4,848 followers on LinkedIn. dōTERRA (CPTG) Certified Pure Therapeutic Grade® essential oils represent the safest, purest, and most beneficial essential oils available today. Essential oils are natural aromatic compounds found in the seeds, bark, stems, roots, flowers and other parts of plants. In addition to their intrinsic protective benefits to plants and offering beautiful fragrant to people, essential oils have been used throughout history in many cultures for their therapeutic benefits.