International Board of Certified Lactation Consultant (IBCLC) Practice Exam

Which of the following herbs is NOT commonly known to reduce milk supply?

1. Peppermint

2. Sage

3. Fennel

4. Spearmint

The correct answer is: Fennel

Fennel is not commonly associated with reducing milk supply; in fact, it is often used to promote lactation. Fennel seeds contain phytoestrogens, which can support milk production in breastfeeding mothers. This herb has a long history of use in various cultures as a galactagogue, which is a substance that helps increase milk supply. On the other hand, herbs like peppermint, sage, and spearmint are known for their potential effects in reducing milk supply. Peppermint and spearmint, both being mints, can lead to a decrease in milk production when consumed in significant amounts. Sage, meanwhile, has traditionally been used to suppress lactation, especially in weaning situations. Understanding the unique properties and traditional uses of these herbs is crucial for lactation consultants when advising breastfeeding mothers on dietary choices that can affect milk production.