Some essential oils are classified as hypertensive (stimulating) or hypotensive (relaxing) and therefore when absorbed into the body can affect our heart rate, blood pressure and breathing. For example, Rosemary (Rosemarinus officinalis) is a hypertensive oil. It has a clean, refreshing, camphoraceous aroma containing oxides which stimulate the nervous, digestive and reproductive system. It is cephalic which means it’s good for your head; it stimulates memory, helpful for mental fatigue, headaches and lethargy. One drop in your palm (rub together and breathe in) before an exam can be clarifying. It is not recommended for those with high blood pressure. On flip side, Ylang ylang (Canaga odorata) – a sweet, heavy oil, is hypotensive. Containing sesquiterpenes it is calming, balancing and relaxing. It regulates the flow of adrenaline therefore reduces blood pressure. If you are feeling stressed, frustrated, angry or panicky, 1-2 drops of this oil in an oil burner or on your pillow at night will smooth and balance your hormones. These oils go beautifully together. Combine 1 drop of each in a burner and get the best of both worlds. Happy Aromatherapy Awareness Week!