Pennyroyal is the smallest of the mint family, and has some very distinctive properties. The taste and odor of pennyroyal is stronger and far more pungent than other mints, which makes it disagreeable to many people. It's also disagreeable to insects, and pennyroyal has been used as a natural insect repellant for centuries. Like the other mints, it helps soothe digestion and may reduce muscle spasms.*
Note: Not to be used during pregnancy. Not to be used while nursing. Not for use by women with a heavy menstrual flow. Not recommended for use in infants, children, or in persons with liver or kidney disease.