
A high-caffeine herbal tea made from the leaves of the holly tree Ilex paraguariensis, known for providing a sense of alertness and focus.
Caffeine in the form of coffee or yerba mate or any other form of caffeine does create a sense of alertness in our brain and body.
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"Andrew Huberman explicitly mentions yerba mate as a form of caffeine he uses to create a sense of alertness for learning and memory."