Pennyroyal is derived from leaves of either Mentha pulegium or Hedeoma pulegoides, plants of the mint family that are native to Europe. Pennyroyal extract contains many components, but primarily contains the volatile oil pulegone and other monoterpenes. Pennyroyal has a strong fragrance similar to spearmint and was used for centuries to flavor food, wine and herbal teas. Pennyroyal extracts were also used as a traditional herb and folk remedy; a particular use was to stimulate menstruation and, in higher concentrations, to induce abortion. Pennyroyal tea and leaf extracts have been used without serious side effects.
Please use with caution. Pennyroyal is an herbal extract or oil derived from leaves of the plant in the mint genus (Mentha pulegium) that was used in the past as an insect repellent and an abortifacient. When taken by mouth, pennyroyal oil is highly toxic and has been linked to several instances of toxic liver injury and death.