- Our Wild Berry Yerba Mate tea is a scrumptuous all-natural flavored Yerba Mate coffee substitute with Blueberries, Blackberry and Strawberries that will refresh you with its terrific taste! You will enjoy the earthy and acidity-free Wild Berry aroma and flavor again and again! – Ingredients: Yerba Mate, Blueberries, Blackberry, Strawberries and Natural Wild Berry Flavor.