The primary constituent of peppermint oil is menthol, which causes a physical reaction when inhaled or applied to the skin. Menthol produces an immediate and pronounced sensation of coolness which the body reacts to quite strongly, producing its own "warming effect" as blood flows into the area of application. This physical sensation impresses the senses as a "medicinal" effect and is partially responsible for peppermint's long history of use as medicine. Today, menthol is often found in sports creams and chest rubs. Peppermint oil can be both energizing and soothing. This is not as contradictory as it seems if one takes into account peppermint's unique aroma and the constituent menthol. At first cooling and bracing, then warming and comforting, the body and mind seem to tune into and benefit from the needed characteristic.

Lavender’s perfectly balanced floral-herbaceous aroma provides an unmatched array of attributes—calming, relaxing, refreshing, toning and cleansing—making it the most popular oil in aromatherapy.

Orange oil is pressed from the peels of ripe, sweet oranges. It has a lively, fruity, sweet aroma. The aromatherapy benefits are cheering, refreshing and uplifting.

Chamomile is a mild, soothing oil. The aromatherapy benefits are calming, relaxing, soothing.