It is this balance which makes the oil more or less toxic than another. The constitutes of this oil or when combined, those of another may make the oil less toxic and more suitable for therapeutic use. Essential oils are often mixed with other essential oils to make a blend. When blending essential oils, it is important to consider their volatility or high rate of evaporation. Some oils have a much higher rate of volatility that others.
Top notes are fastest acting, the quickest to evaporate and the most stimulating and uplifting.
Middle notes are not as volatile and primarily affect the functions of the body eg digestion, menstruation etc, while the base notes are slow to evaporate and are most sedating and relaxing. As referred to earlier, essential oils can assist the body in more than one way. Essential oils enter our body in a number of ways. Most methods of using the oils will result in them entering the body in a number of ways. Small quantities can be added to a bath or sauna, used in hot or cold compresses, in room sprays, evaporated in burners or vaporizes, in inhalations, gargles and mouth washers, perfumes, cooking and massages.