Tea, leaves from the plant Camellia sinensis, contains theanine. Theanine has remarkable properties, as explained in this excellent blog post:
“Theanine does more than simply provide flavour, however. It can cross the blood-brain barrier and has mild psychoactive properties, being considered by many to be a nootropic – i.e., a chemical which improves brain function. Nootropics are compounds which can not only assist cognitive ability, but also act as protective agents for brain neurons. In humans, theanine has been implicated in alleviating physical and mental stress, boosting mood, and improving cognitive performance.”
In this video Dr. Geger makes the case for cold steeped tea:
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