Yerba Mate is a South American plant whose leaves contain caffeine, similar to tea. Studies suggest that yerba mate may improve exercise performance by helping to increase fatty acid oxidation. Additional research into yerba mate's effect on exercise suggest that yerba mate may also help improve focus, concentration, and satiety when exercising. In addition to having caffeine and chlorogenic acid, which are also found in coffee, yerba mate is rich in saponins and polyphenols, including the antioxidants quercetin and rutin.