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Josh-D. S. Davis

Xaminmo / Omnimax / Max Omni / Mad Scientist / Midnight Shadow / Radiation Master

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Yerba Mate is not caffeine free.
Josh 201604 KWP
joshdavis
Maté products are sometimes falsely marketed as "caffeine-free" alternatives to coffee and tea, and said to have fewer negative effects. This is based on a mistaken claim that the primary active xanthine in maté is "mateine", erroneously said to be a stereoisomer of caffeine. However, it is not chemically possible for caffeine to have a stereoisomer, and "mateine" is an official synonym of caffeine in the chemical databases.

http://www.erowid.org/plants/yerba_mate/yerba_mate_chemistry1.shtml