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Re:Yerba Mate – A Long but Current History (2021) by bovermyer on Tuesday December 13, 2022 @12:21PM (#33972145)
After reading the whole thing, here's my summary:

Yerba mate reduces cholesterol, encourages fat loss, improves heart health, and has similar stimulative effects to coffee. However, the method of its preparation is important, as some varieties can increase the risk of certain types of cancer.

Drink it cold in moderate daily amounts for the best effect.

Re:Yerba Mate – A Long but Current History (2021) by opinologo on Tuesday December 13, 2022 @06:59PM (#33978113)
70C / 158F would be enough. According to the paper, it is not different than coffee or tea when it comes to the risk effects drinking it hot