This is a peer-reviewed research article about the use of essential oils and in a clinical setting, such as counselors or therapists:
- Manion, C. R., & Widder, R. M. (2017). Essentials of essential oils. American Journal Of Health-System Pharmacy, 74(9), e153-e162

These naturally occurring, volatile aromatic compounds are found in the seeds, bark, stems, roots, flowers, and other parts of plants. Essential oils give plants their distinctive smells, essential oils protect plants and play a role in plant pollination.