Peppermint Essential Oil 1/3 fl oz. Peppermint has a cooling effect on the skin that is revitalizing and wonderful to the touch, due to its menthol content. Peppermint can be diluted in a carrier oil and applied to the temples and back of the neck for head and neck tension. Strongly dilute in a carrier oil for an uplifting massage. It is also helpful to sniff when having a queasy stomach.