L-theanine does not only possess potent antidepressant and anti-anxiety properties, studies show that this powerful nootropic can also fight stress and its detrimental effects on the body:
1. In healthy participants, L-theanine administration reduced stress responses and cortisol levels. 
2. In participants who underwent a series of stress test, L-theanine intake resulted in anti-stress effects as evidenced by reduced heart rate and salivary immunoglobulin A. [25-26]
3. In healthy adults aged 18-40, L-theanine administration reduced subjective stress response. 
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