One study showed an average 5.1 kg ( 11.2 lb ) weight loss in a group taking a mixture of yerba mate , guarana , and damiana , compared to an average one-pound loss in a placebo group after 45 days .
This study shows an average 11.2 pound weight loss in a group taking a mixture of yerba mate , guaraná and damiana , compared to an average 1 pound loss in a placebo group after 45 days .