Mate also known as chimarrão or cimarrón, is a traditional South American caffeine-rich infused drink. It is made by soaking dried leaves of the holly species Ilex paraguariensis in hot water and is served with a metal straw in a container typically made from a calabash gourd. People who recommend yerba mate say that it can relieve fatigue, aid in weight loss, ease depression, and help treat headaches and various other conditions.