It is extremely rare. To date it has been identified in tea (Camellia sinensis) and in a mushroom (Xerocomus badius, the Bay Bolete).
There are higher amounts in gourmet green tea (look for younger leaves and buds, mountain grown green tea), with lower amounts in oolong and black tea.
Human research has shown improvements in mental performance, with simultaneous improved focus and a general calming effect. Other preliminary studies have shown potential enhancement of the immune system, including multiple cancer studies.
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