Theanine from Green Tea: Cognitve Function & Stress
Theanine, L-theanine, an amino acid contained in green tea leaves, doubled neuron promoter activity in a study by Ogura et al. Theanine also promoted cellular proliferation and neuronal differentiation in a model system.
Theanine is also known to block the binding of L-glutamic acid to glutamate receptors in the brain, and has been considered to cause anti-stress effects by inhibiting cortical neuron excitation. L-theanine has been highlighted for its beneficial effects on cognition and mood.
Mental task performance and physiological activities was studied by Yoto et al after dosing with L-theanine + placebo, caffeine + placebo, or placebo only.
The results showed that L-theanine significantly inhibited the blood-pressure increases in a high-response group. L-theanine also reduced the Tension-Anxiety scores as compared with placebo intake.
The findings indicate that L-theanine not only reduces anxiety but also attenuates the blood-pressure increase in high-stress-response adults. Green Tea is a key ingredient in the natural infusions made by The Wise Herb Company.