http://vvedndyt433kopnhv6vejxnut54y5752vpxshjaqmj7ftwiu6quiv2ad.onion/wiki/L-Theanine
K., Go, H. J., Kim, K., Lim, N. K., Hong, J. T., Ly, S. Y., Rho, S. S. (April 2011). "A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled study".