The herb Pennyroyal (Mentha pulegium, family Lamiaceae), is a member of the mint genus; an essential oil extracte from it is used in aromatherapy. Crushed Pennyroyal leaves and foliage exhibit a very strong spearmint fragrance. Pennyroyal is a traditional folk medicine, poison and abortifacient. This oil is high in pulegone, a highly toxic volatile organic compound, which harms the liver and can stimulate uterine activity.