Essential oils are concentrated plant extracts that retain the natural smell and flavour, or “essence,” of their source. Inhaling the aromas from essential oils can stimulate areas of your limbic system, which is a part of your brain that plays a role in emotions, behaviours, sense of smell, and long-term memory. The limbic system also plays a role in controlling several unconscious physiological functions, such as breathing, heart rate, and blood pressure. Choose from Eucalyptus, Lemon or Lime.