UNIVFOOD

Guayusa is a leaf of Amazon tree and have this properties:

Antioxidant
The polyphenolic compounds of this beverage can help to reduce oxidative stress and prevent the negative effects of free radicals, which can lead to chronic disease and cancer. 
Energy Levels
Caffeine is a powerful stimulant, and with a good amount of caffeine in each cup, many people rely on this tea to give them a morning boost of energy. 
Weight Loss
Low in calories and able to stimulate the metabolism, this tea can also aid in weight loss efforts.