Sometimes called the “life force” of a plant, essential oils are very complex. They are stored in special cells, ducts, or glandular hairs that are distributed among the flowers, leaves, bark, stems, and roots of a plant. These oils protect the plant from injuries, insects, and microorganisms. These unique characteristics make essential oils highly beneficial to humans. A single oil may contain hundreds of constituents that are molecularly aligned in exactly the right manner to trigger a number of responses in the human body. Essential oils are used by chiropractors, aromatherapists, reflexologists, massage therapists, and others interested in natural health.