Yerba mate is a tree that originates from South America. The leaves of the Ilex paraguaensis contain a natural form of caffeine (mateine). It's used for its energizing and antioxidantic properties, usually as a tea or cold beverage.
Yerba mate has been claimed to have various effects on human health and these may improve allergy symptoms and reduce the risk of diabetes mellitus and high blood sugar. These effects have been attributed to the high quantity of polyphenols found in mate tea. Yerba mate also contains compounds that act as an appetite suppressant and possible weight loss tool, increases mental energy and focus, improves mood, and promotes deeper sleep; however, sleep may only be affected in people who are sensitive to caffeine.