Businesses in the essential oils category produce, supply or sell concentrated aromatic extracts obtained from plants, including leaves, flowers, roots, bark and peel. Products may be made by steam distillation, cold pressing or other extraction methods. Businesses may offer single oils, such as lavender or peppermint, as well as blends, with information about ingredients, botanical names, extraction methods and intended uses. Some also supply carrier oils used to dilute essential oils before application to the skin. Customers can expect products and advice for uses such as aromatherapy, room fragrance, diffusers, massage and making personal-care or household products. Related stock may include oil burners, diffusers, storage bottles and blending accessories. Essential oils are concentrated and can cause irritation or allergic reactions; businesses may provide guidance on safe dilution and use.