These volatile, rapidly evaporating oils are obtained from the leaves, stem, flower, seed or root of a plant, and usually carry the odor that is characteristic of the plant. Essential oils are used in cosmetics, aromatherapy, medicine, perfumery and flavoring. They add fragrance to natural skin care products, as well as contribute to their healthful and beautifying qualities through their various abilities to tone, balance, relax, cleanse and invigorate. Although all essential oils are 'fragrant', not all 'fragrances' are essential oils. True essential oils are plant-derived.