Does yerba mate contain caffeine?
Yerba mate is an herbal tea that is popular in South America. Guayaki is a popular maker of yerba mate and their drinks vary from 6.7 to 10mg of caffeine per oz of liquid. That ranges from 50-80mg of caffeine per 8oz cup. That compares to 47mg of caffeine in black tea or about 80mg of caffeine for 8oz of Red Bull.
I have not tried this drink yet, but it sounds pretty enticing according to Guayaki:
Yerba mate has the strength of coffee, the health benefits of tea, and the euphoria of chocolate
https://guayaki.com/why-yerba-mate/