Pennyroyal (Mentha pulegium or Hedeoma pulegioides) has a long history of use in traditional herbal medicine, particularly in Europe and North America. Traditionally, pennyroyal has been used to address various menstrual complaints, including menstrual irregularities and symptoms sometimes associated with premenstrual syndrome (PMS), such as bloating and irritability. However, there is little specificity in historical texts regarding the use of pennyroyal for PMS Type C, which is characterized by symptoms like carbohydrate craving, increased appetite, and fatigue. Rather, pennyroyal’s traditional use was more general for menstrual discomfort or as an emmenagogue (to stimulate menstrual flow).

Modern scientific research on pennyroyal’s efficacy for PMS—especially Type C—is virtually nonexistent. No clinical trials or pharmacological studies substantiate its use for this specific PMS subtype. Furthermore, pennyroyal oil is known to be toxic, particularly to the liver, and can be fatal if ingested in even moderate doses, which has led to significant safety concerns and a decline in its use.

In summary, the use of pennyroyal for PMS Type C is supported only by vague traditional references to menstrual symptom relief, not by scientific evidence or detailed historical records for this specific condition.