Essential oils are the isolated aroma compounds from plants. There are many ways to extract the oils, resulting in different grades or qualities. For example, some essential oils are food grade, meaning that you consume the oil in food and beverages. Essential oils have many uses. For example, an aromatherapist will use essential oils in salves, lotions, sachets and nebulizers to help boost mood, calm nerves, or stimulate healing in the body. Herbalists might use essential oils in teas, salves or humidifiers to relieve symptoms of illness. Massage therapists often use essential oils in their massage oils. Various essential oils will have different uses depending on their properties, which is why it is a good idea to work with a licensed and experienced practitioner. For example, cinnamon oil is best consumed in food or drink, tea tree oil is best used topically, and lavender is most potent when smelled. Most essential oils need to have a carrier oil such as Almond oil to dilute their intensity at full strength.