Recharge your batteries the healthy way with the revitalizing herbal power of Swanson Yerba Mate. For hundreds of years the people of Argentina, Brazil, Paraguay and Uruguay have used yerba mate leaves to make a stimulating drink that reenergizes the body and mind. These leaves are a source of alkaloids such as theobromine as well as caffeic acid derivatives, saponins, caffeine and several antioxidant flavonoids.