Yes! Yes!
Yerba mate contributes tremendously to the overall antioxidant intakes - is higher in antioxidants than green tea! In fact, a 2018 study even showed that its antioxidant properties were also present in used yerba.
Ferreira Cuelho and others also sustain that yerba mate is antioxidant, anti-inflammatory, antimutagenic, antidiabetic and lipid-lowering activities, making it beneficial to those on chronic diseases with inflammatory components, diabetes, and lipid metabolism disorders.