Yerba Mate is native to South America and the official drink of Argentina, primarily known for weight loss assistance and cancer prevention. It contains caffeine, but provides a clear, focused energy that some prefer to coffee or tea. It's also used to treat headaches, relieve fatigue, as a nerve tonic, stimulant, diuretic, laxative, astringent, rejuvenator, aperient and purgative. Common medicinal uses include: improves concentration and memory, improves motor response, boosts metabolism, fights fatigue, combats obesity, stimulates adrenal glands.