Our Lady's mild thistle is a flowering plant known for its medicinal properties. Its Latin name is Carduus marianus, and it is commonly called milk thistle or holy thistle. Milk thistle has been used as a natural remedy for liver problems, such as cirrhosis and fatty liver disease. Other synonyms for milk thistle include St. Mary's thistle, Marian thistle, and Mediterranean milk thistle. This herb is native to the Mediterranean region, but it is also grown in other parts of the world, such as the United States and Europe. The seeds of the milk thistle plant are often used to make supplements and extracts for medicinal purposes.