The acute effects of L--theanine in comparison with alprazolam on anticipatory anxiety in humans.

Abstract Author(s): Lu K1, Gray MA, Oliver C, Liley DT, Harrison BJ, Bartholomeusz CF, Phan KL, Nathan PJ.

Abstract Source: Human Psychopharmacology Clinical and Experimental 19(7):457-​-65 · October 2004 

CONCLUSION: “Thus, it was suggested that the oral intake of L-Theanine could cause anti-stress effects via the inhibition of cortical neuron excitation.”

Article Published Date: May 2004