Green tea comes from the leaves of the Camellia sinensis plant, which is native to East Asia and Southeast Asia
Others include glucose-dependent insulinotropic polypeptide (GIP), ghrelin, peptide YY (PYY) and pancreatic polypeptide (PP) (1)
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I was skeptical at first, but I can say that I feel sharper and more clear minded than as long as I can remember.John Y Frequently Asked Questions What are nootropics and what do they do
Mori H, Yoshimi N, Iwata H, Mori Y, Hara A, Tanaka T, Kawai K (1990) Carcinogenicity of naturally occurring 1-hydroxyanthraquinone in rats: induction of large bowel, liver and stomach neoplasms
doi: 10.1210/jc.80.3.952