ABSTRACT
Essential oils are highly concentrated substances extracted from flowers, leaves, stems, roots, seeds, barks, resins, or fruit rinds. The levels of essential oils found in plants can be anywhere from 0.01% to 10% of the total. This is why tons of plant materials are required for just a few hundred pounds of oil. These oils are often used for their flavor and their therapeutic or odoriferous properties, in a wide selection of products such as foods, medicines, and cosmetics.
