Black Pepper Essential Oil: Piper Nigrum Fruit Oil Never ingest or apply undiluted essential oils to the skin. Black pepper oil has a beautifully sharp and spiced aroma and will not cause the reactions such as sneezing that ground pepper can. It has a warming but stimulating effect. In aromatherapy, black pepper is used for a wide variety of purposes including improving circulation and easing aching muscles or mild joint discomfort. It is particularly suited to blends where it can add warmth and tie top and base notes together.