How do you use pennyroyal to induce menstruation?

It is not safe or recommended to use pennyroyal or any herbal remedy to induce menstruation. Pennyroyal is a toxic plant that can cause various health problems, including liver and kidney damage, seizures, and even death in high doses. It is important to consult a healthcare professional if you are experiencing menstrual irregularities rather than resorting to herbal remedies. There are safe and effective medical options available to regulate menstruation.