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Passionflower in the treatment of generalized anxiety: a pilot double-blind randomized controlled trial with oxazepam. 
Akhondzadeh S, Naghavi HR, Vazirian M, Shayeganpour A, Rashidi H, Khani M. Journal of Clinical Pharmacy and Therapeutics, 2001 Oct;26(5):363-7. 

A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality. 
Ngan A, Conduit R. Phytotherapy Research, 2011 Aug;25(8):1153-9 

Extract of valerian root (Valeriana officinalis L.) vs. placebo in treatment of obsessive-compulsive disorder: a randomized double-blind study. 
Pakseresht S, Boostani H, Sayyah M. Journal of Complementary and Integrative Medicine, 2011 Oct 11;8. 

Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. 
Yoto A, Motoki M, Murao S, Yokogoshi H. Journal of Physiological Anthropology. 2012 Oct 29;31:28. 

L-Theanine reduces psychological and physiological stress responses. 
Kimura K, Ozeki M, Juneja LR, Ohira H. Biological Psychology, 2007 Jan;74(1):39-45. 

Passionflower in the treatment of opiates withdrawal: a double-blind randomized controlled trial. 
Akhondzadeh S, Kashani L, Mobaseri M, Hosseini SH, Nikzad S, Khani M. J Clinical Pharmacy and Therapeutics. 2001 Oct;26(5):369-73. 

Reduction effect of theanine on blood pressure and brain 5-hydroxyindoles in spontaneously hypertensive rats.. 
Yokogoshi H, Kato Y, Sagesaka YM, Takihara-Matsuura T, Kakuda T, et al. Biological Psychology, Bioscience, Biotechnology and Biochemistry. 1995;59(4):615-8. 

Attenuation of benzodiazepine dependence in mice by a tri-substituted benzoflavone moiety of Passiflora incarnata Linneaus: a non-habit forming anxiolytic. 
Dhawan K, Dhawan S, Chhabra S. Journal of Pharmacy and Pharmaceutical Sciences, 2003 May-Aug;6(2):215-22. 

Suppression of alcohol-cessation-oriented hyper-anxiety by the benzoflavone moiety of Passiflora incarnata Linneaus in mice. 
Dhawan K, Kumar S, Sharma A. Journal of Ethnopharmacology. 2002 Jul;81(2):239-44. 

Influence of alkylamides of glutamic acid and related compounds on the central nervous system. I. Central depressant effect of theanine. 
Kimura R, Murata T. Chemical & Pharmaceutical Bulletin (Tokyo), 1971;19(6):1257-61.