Theanine prevents memory impairment induced by repeated cerebral ischemia in rats

You'll have to ask your doctor if this was followed up with human testing in the past 10 years. Or if NOTHING WAS DONE LIKE USUAL. 
https://www.ncbi.nlm.nih.gov/pubmed/17705146 

 

Egashira N¹, Ishigami N, Pu F, Mishima K, Iwasaki K, Orito K, Oishi R, Fujiwara M.

Author information

Abstract

The present study investigated the neuroprotective effect of gamma-glutamylethylamide (theanine), a component Japanese green tea (Camellia sinensis), on memory impairment induced by twice-repeated cerebral ischemia in rats. Theanine was injected i.p. immediately after the first occlusion. Theanine (0.3 and 1 mg/kg) significantly prevented the impairment of spatial memory in rats subjected to repeated cerebral ischemia, 7 days after the second reperfusion. Moreover, theanine (1 mg/kg) significantly inhibited the decrease in the number of surviving cells in the hippocampal CA1 field in the same rats. These results suggest that theanine prevents memory impairment induced by repeated cerebral ischemia, in part by protecting against neuronal cell death, and that it might be useful for preventing cerebrovascular disease.

PMID:

17705146

DOI:

10.1002/ptr.2261

[Indexed for MEDLINE]